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<!-- Weave of 'Dictionaries' generated by Inweb -->
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< div class = "breadcrumbs" >
< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "index.html" > foundation< / a > < / li > < li > < a href = "index.html#2" > Chapter 2: Memory, Streams and Collections< / a > < / li > < li > < b > Dictionaries< / b > < / li > < / ul > < / div >
< p class = "purpose" > A simple implementation for a flexible-sized dictionary of key-value pairs.< / p >
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< ul class = "toc" > < li > < a href = "2-dct.html#SP1" > § 1. Storage< / a > < / li > < li > < a href = "2-dct.html#SP2" > § 2. Creation< / a > < / li > < li > < a href = "2-dct.html#SP3" > § 3. Logging< / a > < / li > < li > < a href = "2-dct.html#SP4" > § 4. Hashing< / a > < / li > < li > < a href = "2-dct.html#SP5" > § 5. Create, find, destroy< / a > < / li > < li > < a href = "2-dct.html#SP8" > § 8. Accessing entries< / a > < / li > < li > < a href = "2-dct.html#SP11" > § 11. Disposal< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. Storage. < / b > There's nothing fancy here. A "dictionary" is a hash table allowing reasonably
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efficient lookup: it's a correspondence between "keys", which are texts, and
pointers to some external structure. Often these will also be texts, but
not necessarily.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > values are texts?< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > no_entries< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > total number of key-value pairs currently stored here< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > hash_table_size< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > size of array...< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > hash_table< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > ...of linked lists of dictionary entries< / span >
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< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > CLASS_DEFINITION< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > ;< / span >
< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > vacant< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > a "vacant" entry is not currently used to store a k-v pair< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > for non-vacant entries only: the key text< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > value< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > for non-vacant entries only: the value, some kind of pointer< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > next_in_entry< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > The structure dictionary is private to this section.< / li > < li > The structure dict_entry is accessed in 5/ee, 8/bdfw and here.< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. Creation. < / b > Dictionaries can have arbitrary size, in that they expand as needed, but for
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efficiency's sake the caller can set them up with an initial size of her choice.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::new< / span > < button class = "popup" onclick = "togglePopup('usagePopup1')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup1" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::new< / span > < / span > :< br / > < a href = "2-dct.html#SP7_2" > § 7.2< / a > < br / > Command Line Arguments - < a href = "3-cla.html#SP5" > § 5< / a > < br / > String Manipulation - < a href = "4-sm.html#SP27_1" > § 27.1< / a > < br / > HTML - < a href = "5-htm.html#SP11" > § 11< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "dictionary too small"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > CREATE< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > textual< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > no_entries< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > = < / span > < a href = "2-mmr.html#SP24" class = "function-link" > < span class = "function-syntax" > Memory::calloc< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > ), < / span > < span class = "constant-syntax" > DICTIONARY_MREASON< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > hash_table< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ].< / span > < span class = "element-syntax" > vacant< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > hash_table< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ].< / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > hash_table< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ].< / span > < span class = "element-syntax" > next_in_entry< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. Logging. < / b > < / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Dictionaries::log< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Dictionary:\n"< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > unsigned< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > ); < / span > < span class = "constant-syntax" > INDENT< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "function-syntax" > < D-> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Slot %02d:"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = & (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]); < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_in_entry< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > vacant< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > " vacant"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > textual< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > " %S='%S'"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > key< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > " %S=%08x"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > key< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > unsigned< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "\n"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > OUTDENT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. Hashing. < / b > The whole point of a hash table is that it crudely sorts the contents by a rough
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indication of the key values. This crude indication is the hash value, calculated
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here. If there are < span class = "extract" > < span class = "extract-syntax" > N< / span > < / span > slots in the dictionary table, this tells us which slot
(from 0 to < span class = "extract" > < span class = "extract-syntax" > N-1< / span > < / span > ) a given key value belongs in.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Dictionaries::hash< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::hash< / span > < / span > :< br / > < a href = "2-dct.html#SP7_3" > § 7.3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > unsigned< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > hash< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_THROUGH_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > hash< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 16339< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > hash< / span > < span class = "plain-syntax" > + ((< / span > < span class = "reserved-syntax" > unsigned< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < a href = "4-sm.html#SP13" class = "function-link" > < span class = "function-syntax" > Str::get< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) (< / span > < span class = "identifier-syntax" > hash< / span > < span class = "plain-syntax" > % ((< / span > < span class = "reserved-syntax" > unsigned< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. Create, find, destroy. < / b > These three fundamental operations locate the dictionary entry structure for
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a given key value, and then do something to/with it. Note that these pointers
remain valid only until somebody writes a new value into the dictionary;
so be careful if thread safety's an issue.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::find< / span > < button class = "popup" onclick = "togglePopup('usagePopup3')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup3" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::find< / span > < / span > :< br / > < a href = "2-dct.html#SP6" > § 6< / a > , < a href = "2-dct.html#SP8" > § 8< / a > , < a href = "2-dct.html#SP10" > § 10< / a > < br / > Command Line Arguments - < a href = "3-cla.html#SP13" > § 13< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "2-dct.html#SP7" class = "function-link" > < span class = "function-syntax" > Dictionaries::find_p< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::create< / span > < button class = "popup" onclick = "togglePopup('usagePopup4')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup4" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::create< / span > < / span > :< br / > < a href = "2-dct.html#SP6" > § 6< / a > , < a href = "2-dct.html#SP9" > § 9< / a > < br / > Command Line Arguments - < a href = "3-cla.html#SP5" > § 5< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "2-dct.html#SP7" class = "function-link" > < span class = "function-syntax" > Dictionaries::find_p< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Dictionaries::destroy< / span > < button class = "popup" onclick = "togglePopup('usagePopup5')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup5" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::destroy< / span > < / span > :< br / > < a href = "2-dct.html#SP6" > § 6< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-dct.html#SP7" class = "function-link" > < span class = "function-syntax" > Dictionaries::find_p< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , -1);< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. < / b > A nuisance we have to live with is that we often want to express the key
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as wide text (so that we can use literals like < span class = "extract" > < span class = "extract-syntax" > L"my-key"< / span > < / span > ) instead of text
streams. So we also offer versions suffixed < span class = "extract" > < span class = "extract-syntax" > _literal< / span > < / span > :
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::find_literal< / span > < button class = "popup" onclick = "togglePopup('usagePopup6')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup6" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::find_literal< / span > < / span > :< br / > < a href = "2-dct.html#SP8" > § 8< / a > , < a href = "2-dct.html#SP10" > § 10< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%w"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP5" class = "function-link" > < span class = "function-syntax" > Dictionaries::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::create_literal< / span > < button class = "popup" onclick = "togglePopup('usagePopup7')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup7" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::create_literal< / span > < / span > :< br / > < a href = "2-dct.html#SP9" > § 9< / a > < br / > String Manipulation - < a href = "4-sm.html#SP27_1" > § 27.1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%w"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP5" class = "function-link" > < span class = "function-syntax" > Dictionaries::create< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Dictionaries::destroy_literal< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%w"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-dct.html#SP5" class = "function-link" > < span class = "function-syntax" > Dictionaries::destroy< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP7" class = "paragraph-anchor" > < / a > < b > § 7. < / b > So, then, find an entry (if < span class = "extract" > < span class = "extract-syntax" > change< / span > < / span > is < span class = "extract" > < span class = "extract-syntax" > 0< / span > < / span > ), create it (if < span class = "extract" > < span class = "extract-syntax" > +1< / span > < / span > ) or delete
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it (if < span class = "extract" > < span class = "extract-syntax" > -1< / span > < / span > ).
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::find_p< / span > < button class = "popup" onclick = "togglePopup('usagePopup8')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup8" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::find_p< / span > < / span > :< br / > < a href = "2-dct.html#SP5" > § 5< / a > , < a href = "2-dct.html#SP7_2" > § 7.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > change< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "2-dct.html#SP7_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Handle the null dictionary< / span > < span class = "named-paragraph-number" > 7.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > change< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "2-dct.html#SP7_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Expand the dictionary if necessary< / span > < span class = "named-paragraph-number" > 7.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-dct.html#SP7_3" class = "named-paragraph-link" > < span class = "named-paragraph" > Work within the existing dictionary< / span > < span class = "named-paragraph-number" > 7.3< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP7_1" class = "paragraph-anchor" > < / a > < b > § 7.1. < / b > It's legal to perform a find on the null dictionary: the answer's always "no".
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Handle the null dictionary< / span > < span class = "named-paragraph-number" > 7.1< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > change< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "tried to create or destroy in a null dictionary"< / span > < span class = "plain-syntax" > );< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-dct.html#SP7" > § 7< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP7_2" class = "paragraph-anchor" > < / a > < b > § 7.2. < / b > For speed, our policy is that the hash table should have roughly the
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same number of slots as there are entries in the dictionary; that way, each
slot will have an average of one or fewer entries. When we exceed this
ideal population, we double the dictionary's capacity.
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Expand the dictionary if necessary< / span > < span class = "named-paragraph-number" > 7.2< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > no_entries< / span > < span class = "plain-syntax" > > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D2< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP2" class = "function-link" > < span class = "function-syntax" > Dictionaries::new< / span > < / a > < span class = "plain-syntax" > (2*< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > textual< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "function-syntax" > < D-> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++)< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = & (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]); < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_in_entry< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > vacant< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E2< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP7" class = "function-link" > < span class = "function-syntax" > Dictionaries::find_p< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D2< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > key< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E2< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-mmr.html#SP26" class = "function-link" > < span class = "function-syntax" > Memory::I7_free< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > DICTIONARY_MREASON< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > *((< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > )));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > hash_table_size< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > D2< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > hash_table_size< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > hash_table< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > D2< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-dct.html#SP7" > § 7< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP7_3" class = "paragraph-anchor" > < / a > < b > § 7.3. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Work within the existing dictionary< / span > < span class = "named-paragraph-number" > 7.3< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > last_E< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = & (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > [< / span > < a href = "2-dct.html#SP4" class = "function-link" > < span class = "function-syntax" > Dictionaries::hash< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > )]);< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_in_entry< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > last_E< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > vacant< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > change< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ) { < / span > < span class = "named-paragraph-container code-font" > < a href = "2-dct.html#SP7_3_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Make E the new entry< / span > < span class = "named-paragraph-number" > 7.3.1< / span > < / a > < / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "4-sm.html#SP19" class = "function-link" > < span class = "function-syntax" > Str::eq< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > key< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > change< / span > < span class = "plain-syntax" > == -1) < / span > < span class = "named-paragraph-container code-font" > < a href = "2-dct.html#SP7_3_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Destroy the E entry< / span > < span class = "named-paragraph-number" > 7.3.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > change< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > CREATE< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-dct.html#SP7_3_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Make E the new entry< / span > < span class = "named-paragraph-number" > 7.3.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > last_E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_in_entry< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-dct.html#SP7" > § 7< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP7_3_1" class = "paragraph-anchor" > < / a > < b > § 7.3.1. < / b > When creating text values, we want them to be empty strings rather than null
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strings, so that printing to them will work.
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Make E the new entry< / span > < span class = "named-paragraph-number" > 7.3.1< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > vacant< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > = < / span > < a href = "4-sm.html#SP2" class = "function-link" > < span class = "function-syntax" > Str::new< / span > < / a > < span class = "plain-syntax" > (); < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > key< / span > < span class = "plain-syntax" > = < / span > < a href = "4-sm.html#SP3" class = "function-link" > < span class = "function-syntax" > Str::duplicate< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > no_entries< / span > < span class = "plain-syntax" > ++;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-dct.html#SP7_3" > § 7.3< / a > (twice).< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP7_3_2" class = "paragraph-anchor" > < / a > < b > § 7.3.2. < / b > When deleting text values, we close them first, to give back the memory.
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Careful: it would not be thread-safe to allow different threads to use the
same dictionary if deletions are a possibility.
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Destroy the E entry< / span > < span class = "named-paragraph-number" > 7.3.2< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > vacant< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > TRUE< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > no_entries< / span > < span class = "plain-syntax" > --;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > textual< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > )) < / span > < a href = "4-sm.html#SP2" class = "function-link" > < span class = "function-syntax" > Str::dispose_of< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-dct.html#SP7_3" > § 7.3< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP8" class = "paragraph-anchor" > < / a > < b > § 8. Accessing entries. < / b > Eventually we're going to want the value. In principle we could be storing
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values which are arbitrary pointers, so we have to use void pointers:
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::value_for_entry< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > de< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > de< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > de< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::read_value< / span > < button class = "popup" onclick = "togglePopup('usagePopup9')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup9" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::read_value< / span > < / span > :< br / > Command Line Arguments - < a href = "3-cla.html#SP13" > § 13< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > ) {< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "textual dictionary accessed as pointy"< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP5" class = "function-link" > < span class = "function-syntax" > Dictionaries::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "read null dictionary entry"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > vacant< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "read vacant dictionary entry"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
2020-04-25 12:26:09 +00:00
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::read_value_literal< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > ) {< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "textual dictionary accessed as pointy"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP6" class = "function-link" > < span class = "function-syntax" > Dictionaries::find_literal< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "read null dictionary entry"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > vacant< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "read vacant dictionary entry"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
2020-04-27 22:43:23 +00:00
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Dictionaries::write_value< / span > < button class = "popup" onclick = "togglePopup('usagePopup10')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup10" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::write_value< / span > < / span > :< br / > Command Line Arguments - < a href = "3-cla.html#SP5" > § 5< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > ) {< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "wrote to null dictionary"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "textual dictionary accessed as pointy"< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP5" class = "function-link" > < span class = "function-syntax" > Dictionaries::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "wrote null dictionary entry"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > vacant< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "wrote vacant dictionary entry"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
2020-04-25 12:26:09 +00:00
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Dictionaries::write_value_literal< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > ) {< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "wrote to null dictionary"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "textual dictionary accessed as pointy"< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP6" class = "function-link" > < span class = "function-syntax" > Dictionaries::find_literal< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "wrote null dictionary entry"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > vacant< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "wrote vacant dictionary entry"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
2020-04-24 10:26:18 +00:00
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP9" class = "paragraph-anchor" > < / a > < b > § 9. < / b > But the commonest use case is that the dictionary stores texts as values,
2019-02-04 22:26:45 +00:00
so we provide convenient wrappers with the correct C types.
< / p >
2020-04-25 10:33:39 +00:00
< pre class = "displayed-code all-displayed-code code-font" >
2021-07-07 22:44:18 +00:00
< span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::create_text< / span > < button class = "popup" onclick = "togglePopup('usagePopup11')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup11" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::create_text< / span > < / span > :< br / > HTML - < a href = "5-htm.html#SP11" > § 11< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > ) {< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "wrote to null dictionary"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "pointy dictionary accessed as textual"< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP5" class = "function-link" > < span class = "function-syntax" > Dictionaries::create< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
2020-04-25 12:26:09 +00:00
< span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::create_text_literal< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > ) {< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "wrote to null dictionary"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "pointy dictionary accessed as textual"< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 23:52:25 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP6" class = "function-link" > < span class = "function-syntax" > Dictionaries::create_literal< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > );< / span >
2020-04-21 16:55:17 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
2020-04-24 10:26:18 +00:00
< / pre >
2020-08-16 17:39:53 +00:00
< p class = "commentary firstcommentary" > < a id = "SP10" class = "paragraph-anchor" > < / a > < b > § 10. < / b > We only need a read operation, because the caller can write to the dictionary
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entry by reading the text pointer and then using < span class = "extract" > < span class = "extract-syntax" > WRITE_TO< / span > < / span > .
2019-02-04 22:26:45 +00:00
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
2021-07-07 22:44:18 +00:00
< span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::get_text< / span > < button class = "popup" onclick = "togglePopup('usagePopup12')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup12" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::get_text< / span > < / span > :< br / > HTML - < a href = "5-htm.html#SP11" > § 11< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "pointy dictionary accessed as textual"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP5" class = "function-link" > < span class = "function-syntax" > Dictionaries::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > key< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Dictionaries::get_text_literal< / span > < button class = "popup" onclick = "togglePopup('usagePopup13')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup13" > Usage of < span class = "code-font" > < span class = "function-syntax" > Dictionaries::get_text_literal< / span > < / span > :< br / > String Manipulation - < a href = "4-sm.html#SP27_1" > § 27.1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "pointy dictionary accessed as textual"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-dct.html#SP6" class = "function-link" > < span class = "function-syntax" > Dictionaries::find_literal< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > lit< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *) < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP11" class = "paragraph-anchor" > < / a > < b > § 11. Disposal. < / b > If a dictionary was only needed temporarily then we should dispose of it
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and free the memory when done:
< / p >
2020-04-25 10:33:39 +00:00
< pre class = "displayed-code all-displayed-code code-font" >
2020-04-25 12:26:09 +00:00
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Dictionaries::dispose_of< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dictionary< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > textual< / span > < span class = "plain-syntax" > )< / span >
2020-05-09 12:05:00 +00:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "function-syntax" > < D-> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++)< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = & (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]); < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_in_entry< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > vacant< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < a href = "4-sm.html#SP2" class = "function-link" > < span class = "function-syntax" > Str::dispose_of< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > value< / span > < span class = "plain-syntax" > );< / span >
2020-05-09 12:05:00 +00:00
< span class = "plain-syntax" > < / span > < a href = "2-mmr.html#SP26" class = "function-link" > < span class = "function-syntax" > Memory::I7_free< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > DICTIONARY_MREASON< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table_size< / span > < span class = "plain-syntax" > *((< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > dict_entry< / span > < span class = "plain-syntax" > )));< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > hash_table< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "2-llas.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-abgtf.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-fm.html" > 1< / a > < / li > < li class = "progresscurrentchapter" > 2< / li > < li class = "progresssection" > < a href = "2-dl.html" > dl< / a > < / li > < li class = "progresssection" > < a href = "2-mmr.html" > mmr< / a > < / li > < li class = "progresssection" > < a href = "2-fc.html" > fc< / a > < / li > < li class = "progresssection" > < a href = "2-lcl.html" > lcl< / a > < / li > < li class = "progresssection" > < a href = "2-str.html" > str< / a > < / li > < li class = "progresssection" > < a href = "2-wal.html" > wal< / a > < / li > < li class = "progresssection" > < a href = "2-mth.html" > mth< / a > < / li > < li class = "progresssection" > < a href = "2-llas.html" > llas< / a > < / li > < li class = "progresscurrent" > dct< / li > < li class = "progresssection" > < a href = "2-trs.html" > trs< / a > < / li > < li class = "progresschapter" > < a href = "3-em.html" > 3< / a > < / li > < li class = "progresschapter" > < a href = "4-chr.html" > 4< / a > < / li > < li class = "progresschapter" > < a href = "5-htm.html" > 5< / a > < / li > < li class = "progresschapter" > < a href = "6-bf.html" > 6< / a > < / li > < li class = "progresschapter" > < a href = "7-vn.html" > 7< / a > < / li > < li class = "progresschapter" > < a href = "8-ws.html" > 8< / a > < / li > < li class = "progressnext" > < a href = "2-trs.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >