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<!-- Weave of 'Enumerated Constants' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "index.html" > inweb< / a > < / li > < li > < a href = "index.html#2" > Chapter 2: Parsing a Web< / a > < / li > < li > < b > Enumerated Constants< / b > < / li > < / ul > < p class = "purpose" > To define sequentially numbered values for families of constants.< / p >
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< p class = "inwebparagraph" > < a id = "SP1" > < / a > < b > § 1. < / b > The idea here is that each enumeration set is a sequence of named constants
with a given postfix: for example, < code class = "display" > < span class = "extract" > HARRY_ST< / span > < / code > , < code class = "display" > < span class = "extract" > NEVILLE_ST< / span > < / code > , < code class = "display" > < span class = "extract" > ANGELINA_ST< / span > < / code >
form the < code class = "display" > < span class = "extract" > *_ST< / span > < / code > set. By definition, the postfix part is the portion of the
name following the final underscore, so in this case < code class = "display" > < span class = "extract" > ST< / span > < / code > .
< / p >
< p class = "inwebparagraph" > Each set of constants begins at a given value (typically 0) and then
increments sequentially in definition order.
< / p >
< pre class = "display" >
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< span class = "reserved" > typedef< / span > < span class = "plain" > < / span > < span class = "reserved" > struct< / span > < span class = "plain" > < / span > < span class = "reserved" > enumeration_set< / span > < span class = "plain" > {< / span >
< span class = "reserved" > struct< / span > < span class = "plain" > < / span > < span class = "reserved" > text_stream< / span > < span class = "plain" > *< / span > < span class = "identifier" > postfix< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > struct< / span > < span class = "plain" > < / span > < span class = "reserved" > text_stream< / span > < span class = "plain" > *< / span > < span class = "identifier" > stub< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > int< / span > < span class = "plain" > < / span > < span class = "identifier" > first_value< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > int< / span > < span class = "plain" > < / span > < span class = "identifier" > next_free_value< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > struct< / span > < span class = "plain" > < / span > < span class = "reserved" > source_line< / span > < span class = "plain" > *< / span > < span class = "identifier" > last_observed_at< / span > < span class = "plain" > ;< / span >
< span class = "constant" > MEMORY_MANAGEMENT< / span >
< span class = "plain" > } < / span > < span class = "reserved" > enumeration_set< / span > < span class = "plain" > ;< / span >
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< / pre >
< p class = "inwebparagraph" > < / p >
< p class = "endnote" > The structure enumeration_set is private to this section.< / p >
< p class = "inwebparagraph" > < a id = "SP2" > < / a > < b > § 2. < / b > There won't be enough sets to make a hash table worth the overhead, so
compare all against all:
< / p >
< pre class = "display" >
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< span class = "reserved" > enumeration_set< / span > < span class = "plain" > *< / span > < span class = "functiontext" > Enumerations::find< button class = "popup" onclick = "togglePopup('usagePopup51')" > ...< span class = "popuptext" id = "usagePopup51" > Usage of < b > Enumerations::find< / b > :< br > < a href = "2-ec.html#SP3" > § 3< / a > < / span > < / button > < / span > < span class = "plain" > (< / span > < span class = "reserved" > text_stream< / span > < span class = "plain" > *< / span > < span class = "identifier" > post< / span > < span class = "plain" > ) {< / span >
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< span class = "reserved" > enumeration_set< / span > < span class = "plain" > *< / span > < span class = "identifier" > es< / span > < span class = "plain" > = < / span > < span class = "identifier" > NULL< / span > < span class = "plain" > ;< / span >
< span class = "identifier" > LOOP_OVER< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > , < / span > < span class = "reserved" > enumeration_set< / span > < span class = "plain" > )< / span >
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< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "functiontext" > < a href = "../foundation-module/4-sm.html#SP18" > Str::eq< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > post< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > postfix< / span > < span class = "plain" > ))< / span >
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< span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "identifier" > es< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "identifier" > NULL< / span > < span class = "plain" > ;< / span >
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< span class = "plain" > }< / span >
< / pre >
< p class = "inwebparagraph" > < / p >
< p class = "inwebparagraph" > < a id = "SP3" > < / a > < b > § 3. < / b > The following is called when an enumeration is found. If < code class = "display" > < span class = "extract" > from< / span > < / code > has a
sensible value, this is the start of a new enumeration set; otherwise it's
a further constant in what ought to be an existing set.
< / p >
< pre class = "display" >
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< span class = "reserved" > void< / span > < span class = "plain" > < / span > < span class = "functiontext" > Enumerations::define< button class = "popup" onclick = "togglePopup('usagePopup52')" > ...< span class = "popuptext" id = "usagePopup52" > Usage of < b > Enumerations::define< / b > :< br > The Parser - < a href = "2-tp.html#SP1_1_7_5_1_7" > § 1.1.7.5.1.7< / a > < / span > < / button > < / span > < span class = "plain" > (< / span > < span class = "constant" > OUTPUT_STREAM< / span > < span class = "plain" > , < / span > < span class = "reserved" > text_stream< / span > < span class = "plain" > *< / span > < span class = "identifier" > symbol< / span > < span class = "plain" > ,< / span >
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< span class = "reserved" > text_stream< / span > < span class = "plain" > *< / span > < span class = "identifier" > from< / span > < span class = "plain" > , < / span > < span class = "reserved" > source_line< / span > < span class = "plain" > *< / span > < span class = "identifier" > L< / span > < span class = "plain" > ) {< / span >
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< span class = "identifier" > TEMPORARY_TEXT< / span > < span class = "plain" > (< / span > < span class = "identifier" > pf< / span > < span class = "plain" > );< / span >
< < span class = "cwebmacro" > Find the postfix in this symbol name< / span > < span class = "cwebmacronumber" > 3.1< / span > > < span class = "plain" > ;< / span >
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< span class = "reserved" > enumeration_set< / span > < span class = "plain" > *< / span > < span class = "identifier" > es< / span > < span class = "plain" > = < / span > < span class = "functiontext" > < a href = "2-ec.html#SP2" > Enumerations::find< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > pf< / span > < span class = "plain" > );< / span >
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< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > from< / span > < span class = "plain" > == < / span > < span class = "identifier" > NULL< / span > < span class = "plain" > ) < / span > < < span class = "cwebmacro" > Continue existing set< / span > < span class = "cwebmacronumber" > 3.2< / span > >
< span class = "reserved" > else< / span > < span class = "plain" > < / span > < < span class = "cwebmacro" > Begin new set< / span > < span class = "cwebmacronumber" > 3.3< / span > > < span class = "plain" > ;< / span >
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< span class = "identifier" > DISCARD_TEXT< / span > < span class = "plain" > (< / span > < span class = "identifier" > pf< / span > < span class = "plain" > );< / span >
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< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > ) < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > last_observed_at< / span > < span class = "plain" > = < / span > < span class = "identifier" > L< / span > < span class = "plain" > ;< / span >
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< span class = "plain" > }< / span >
< / pre >
< p class = "inwebparagraph" > < / p >
< p class = "inwebparagraph" > < a id = "SP3_1" > < / a > < b > § 3.1. < / b > So for instance < code class = "display" > < span class = "extract" > HARRY_ST< / span > < / code > to < code class = "display" > < span class = "extract" > ST< / span > < / code > :
< / p >
< p class = "macrodefinition" > < code class = "display" >
< < span class = "cwebmacrodefn" > Find the postfix in this symbol name< / span > < span class = "cwebmacronumber" > 3.1< / span > > =
< / code > < / p >
< pre class = "displaydefn" >
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< span class = "reserved" > match_results< / span > < span class = "plain" > < / span > < span class = "identifier" > mr< / span > < span class = "plain" > = < / span > < span class = "functiontext" > < a href = "../foundation-module/4-pm.html#SP9" > Regexp::create_mr< / a > < / span > < span class = "plain" > ();< / span >
< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "functiontext" > < a href = "../foundation-module/4-pm.html#SP10" > Regexp::match< / a > < / span > < span class = "plain" > (& < / span > < span class = "identifier" > mr< / span > < span class = "plain" > , < / span > < span class = "identifier" > symbol< / span > < span class = "plain" > , < / span > < span class = "identifier" > L< / span > < span class = "string" > "%c*_(%C+?)"< / span > < span class = "plain" > )) < / span > < span class = "functiontext" > < a href = "../foundation-module/4-sm.html#SP16" > Str::copy< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > pf< / span > < span class = "plain" > , < / span > < span class = "identifier" > mr< / span > < span class = "plain" > .< / span > < span class = "element" > exp< / span > < span class = "plain" > [0]);< / span >
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< span class = "reserved" > else< / span > < span class = "plain" > {< / span >
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< span class = "functiontext" > < a href = "1-pc.html#SP8" > Main::error_in_web< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > I< / span > < span class = "string" > "enumeration constants must belong to a _FAMILY"< / span > < span class = "plain" > , < / span > < span class = "identifier" > L< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > WRITE_TO< / span > < span class = "plain" > (< / span > < span class = "identifier" > pf< / span > < span class = "plain" > , < / span > < span class = "string" > "BOGUS"< / span > < span class = "plain" > );< / span >
< span class = "plain" > }< / span >
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< span class = "functiontext" > < a href = "../foundation-module/4-pm.html#SP9" > Regexp::dispose_of< / a > < / span > < span class = "plain" > (& < / span > < span class = "identifier" > mr< / span > < span class = "plain" > );< / span >
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< / pre >
< p class = "inwebparagraph" > < / p >
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< p class = "endnote" > This code is used in < a href = "2-ec.html#SP3" > § 3< / a > .< / p >
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< p class = "inwebparagraph" > < a id = "SP3_2" > < / a > < b > § 3.2. < / b > < code class = "display" >
< < span class = "cwebmacrodefn" > Continue existing set< / span > < span class = "cwebmacronumber" > 3.2< / span > > =
< / code > < / p >
< pre class = "displaydefn" >
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< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > ) {< / span >
< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > stub< / span > < span class = "plain" > ) < / span > < span class = "identifier" > WRITE< / span > < span class = "plain" > (< / span > < span class = "string" > "(%S+"< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > stub< / span > < span class = "plain" > );< / span >
< span class = "identifier" > WRITE< / span > < span class = "plain" > (< / span > < span class = "string" > "%d"< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > next_free_value< / span > < span class = "plain" > ++);< / span >
< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > stub< / span > < span class = "plain" > ) < / span > < span class = "identifier" > WRITE< / span > < span class = "plain" > (< / span > < span class = "string" > ")"< / span > < span class = "plain" > );< / span >
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< span class = "plain" > } < / span > < span class = "reserved" > else< / span > < span class = "plain" > < / span > < span class = "functiontext" > < a href = "1-pc.html#SP8" > Main::error_in_web< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > I< / span > < span class = "string" > "this enumeration _FAMILY is unknown"< / span > < span class = "plain" > , < / span > < span class = "identifier" > L< / span > < span class = "plain" > );< / span >
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< / pre >
< p class = "inwebparagraph" > < / p >
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< p class = "endnote" > This code is used in < a href = "2-ec.html#SP3" > § 3< / a > .< / p >
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< p class = "inwebparagraph" > < a id = "SP3_3" > < / a > < b > § 3.3. < / b > < code class = "display" >
< < span class = "cwebmacrodefn" > Begin new set< / span > < span class = "cwebmacronumber" > 3.3< / span > > =
< / code > < / p >
< pre class = "displaydefn" >
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< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > ) < / span > < span class = "functiontext" > < a href = "1-pc.html#SP8" > Main::error_in_web< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > I< / span > < span class = "string" > "this enumeration _FAMILY already exists"< / span > < span class = "plain" > , < / span > < span class = "identifier" > L< / span > < span class = "plain" > );< / span >
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< span class = "reserved" > else< / span > < span class = "plain" > {< / span >
< span class = "identifier" > es< / span > < span class = "plain" > = < / span > < span class = "identifier" > CREATE< / span > < span class = "plain" > (< / span > < span class = "reserved" > enumeration_set< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > postfix< / span > < span class = "plain" > = < / span > < span class = "functiontext" > < a href = "../foundation-module/4-sm.html#SP3" > Str::duplicate< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > pf< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > stub< / span > < span class = "plain" > = < / span > < span class = "identifier" > NULL< / span > < span class = "plain" > ;< / span >
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< span class = "reserved" > if< / span > < span class = "plain" > ((< / span > < span class = "functiontext" > < a href = "../foundation-module/4-sm.html#SP8" > Str::len< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > from< / span > < span class = "plain" > ) < < / span > < span class = "constant" > 8< / span > < span class = "plain" > ) & & < / span >
< span class = "plain" > ((< / span > < span class = "functiontext" > < a href = "../foundation-module/4-pm.html#SP10" > Regexp::match< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > NULL< / span > < span class = "plain" > , < / span > < span class = "identifier" > from< / span > < span class = "plain" > , < / span > < span class = "identifier" > L< / span > < span class = "string" > "%d+"< / span > < span class = "plain" > )) ||< / span >
< span class = "plain" > (< / span > < span class = "functiontext" > < a href = "../foundation-module/4-pm.html#SP10" > Regexp::match< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > NULL< / span > < span class = "plain" > , < / span > < span class = "identifier" > from< / span > < span class = "plain" > , < / span > < span class = "identifier" > L< / span > < span class = "string" > "-%d+"< / span > < span class = "plain" > )))) {< / span >
< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > first_value< / span > < span class = "plain" > = < / span > < span class = "functiontext" > < a href = "../foundation-module/4-sm.html#SP7" > Str::atoi< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > from< / span > < span class = "plain" > , < / span > < span class = "constant" > 0< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > next_free_value< / span > < span class = "plain" > = < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > first_value< / span > < span class = "plain" > + < / span > < span class = "constant" > 1< / span > < span class = "plain" > ;< / span >
< span class = "plain" > } < / span > < span class = "reserved" > else< / span > < span class = "plain" > {< / span >
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< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > stub< / span > < span class = "plain" > = < / span > < span class = "functiontext" > < a href = "../foundation-module/4-sm.html#SP3" > Str::duplicate< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > from< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > first_value< / span > < span class = "plain" > = < / span > < span class = "constant" > 0< / span > < span class = "plain" > ;< / span >
< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > next_free_value< / span > < span class = "plain" > = < / span > < span class = "constant" > 1< / span > < span class = "plain" > ;< / span >
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< span class = "plain" > }< / span >
< span class = "plain" > }< / span >
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< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > stub< / span > < span class = "plain" > ) < / span > < span class = "identifier" > WRITE< / span > < span class = "plain" > (< / span > < span class = "string" > "(%S+"< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > stub< / span > < span class = "plain" > );< / span >
< span class = "identifier" > WRITE< / span > < span class = "plain" > (< / span > < span class = "string" > "%d"< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > first_value< / span > < span class = "plain" > );< / span >
< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > stub< / span > < span class = "plain" > ) < / span > < span class = "identifier" > WRITE< / span > < span class = "plain" > (< / span > < span class = "string" > ")"< / span > < span class = "plain" > );< / span >
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< / pre >
< p class = "inwebparagraph" > < / p >
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< p class = "endnote" > This code is used in < a href = "2-ec.html#SP3" > § 3< / a > .< / p >
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< p class = "inwebparagraph" > < a id = "SP4" > < / a > < b > § 4. < / b > For each set, a further constant is defined to give the range; for example,
we would have < code class = "display" > < span class = "extract" > NO_DEFINED_ST_VALUES< / span > < / code > set to 3. This is notionally placed in
the code at the last line on which an < code class = "display" > < span class = "extract" > *_ST< / span > < / code > value was defined.
< / p >
< pre class = "display" >
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< span class = "reserved" > void< / span > < span class = "plain" > < / span > < span class = "functiontext" > Enumerations::define_extents< button class = "popup" onclick = "togglePopup('usagePopup53')" > ...< span class = "popuptext" id = "usagePopup53" > Usage of < b > Enumerations::define_extents< / b > :< br > The Tangler - < a href = "3-tt.html#SP1_1_1" > § 1.1.1< / a > < / span > < / button > < / span > < span class = "plain" > (< / span > < span class = "constant" > OUTPUT_STREAM< / span > < span class = "plain" > , < / span > < span class = "reserved" > tangle_target< / span > < span class = "plain" > *< / span > < span class = "identifier" > target< / span > < span class = "plain" > , < / span > < span class = "reserved" > programming_language< / span > < span class = "plain" > *< / span > < span class = "identifier" > lang< / span > < span class = "plain" > ) {< / span >
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< span class = "reserved" > enumeration_set< / span > < span class = "plain" > *< / span > < span class = "identifier" > es< / span > < span class = "plain" > ;< / span >
< span class = "identifier" > LOOP_OVER< / span > < span class = "plain" > (< / span > < span class = "identifier" > es< / span > < span class = "plain" > , < / span > < span class = "reserved" > enumeration_set< / span > < span class = "plain" > ) {< / span >
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< span class = "identifier" > TEMPORARY_TEXT< / span > < span class = "plain" > (< / span > < span class = "identifier" > symbol< / span > < span class = "plain" > );< / span >
< span class = "identifier" > TEMPORARY_TEXT< / span > < span class = "plain" > (< / span > < span class = "identifier" > value< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > WRITE_TO< / span > < span class = "plain" > (< / span > < span class = "identifier" > symbol< / span > < span class = "plain" > , < / span > < span class = "string" > "NO_DEFINED_%S_VALUES"< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > postfix< / span > < span class = "plain" > );< / span >
< span class = "identifier" > WRITE_TO< / span > < span class = "plain" > (< / span > < span class = "identifier" > value< / span > < span class = "plain" > , < / span > < span class = "string" > "%d"< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > next_free_value< / span > < span class = "plain" > - < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > first_value< / span > < span class = "plain" > );< / span >
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< span class = "functiontext" > < a href = "4-lm.html#SP10" > LanguageMethods::start_definition< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > OUT< / span > < span class = "plain" > , < / span > < span class = "identifier" > lang< / span > < span class = "plain" > , < / span > < span class = "identifier" > symbol< / span > < span class = "plain" > , < / span > < span class = "identifier" > value< / span > < span class = "plain" > ,< / span >
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< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > last_observed_at< / span > < span class = "plain" > -> < / span > < span class = "element" > owning_section< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > last_observed_at< / span > < span class = "plain" > );< / span >
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< span class = "functiontext" > < a href = "4-lm.html#SP10" > LanguageMethods::end_definition< / a > < / span > < span class = "plain" > (< / span > < span class = "identifier" > OUT< / span > < span class = "plain" > , < / span > < span class = "identifier" > lang< / span > < span class = "plain" > ,< / span >
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< span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > last_observed_at< / span > < span class = "plain" > -> < / span > < span class = "element" > owning_section< / span > < span class = "plain" > , < / span > < span class = "identifier" > es< / span > < span class = "plain" > -> < / span > < span class = "element" > last_observed_at< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > DISCARD_TEXT< / span > < span class = "plain" > (< / span > < span class = "identifier" > symbol< / span > < span class = "plain" > );< / span >
< span class = "identifier" > DISCARD_TEXT< / span > < span class = "plain" > (< / span > < span class = "identifier" > value< / span > < span class = "plain" > );< / span >
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< span class = "plain" > }< / span >
< span class = "plain" > }< / span >
< / pre >
< p class = "inwebparagraph" > < / p >
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< hr class = "tocbar" >
< ul class = "toc" > < li > < a href = "2-tgs.html" > Back to 'Tags'< / a > < / li > < li > < a href = "2-pn.html" > Continue with 'Paragraph Numbering'< / a > < / li > < / ul > < hr class = "tocbar" >
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<!-- End of weave -->
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< script >
function togglePopup(material_id) {
var popup = document.getElementById(material_id);
popup.classList.toggle("show");
}
< / script >
< link href = "Popups.css" rel = "stylesheet" rev = "stylesheet" type = "text/css" >
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< / main >
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< / body >
< / html >