8c6952abc8
int_hash combines two kinds of operation: (1) hashing and equality of integers (2) using spare integer encodings to represent empty and deleted slots (1) is really independent of (2), and could be useful in cases where no spare integer encodings are available. This patch adds a base class (int_hash_base) for (1) and makes int_hash inherit from it. If we follow a similar style for future hashes, we can make unbounded_hashmap_traits take the "base" hash for the key as a template parameter, rather than requiring every type of key to have a separate derivative of unbounded_hashmap_traits. A later patch applies this to vector keys. No functional change intended. gcc/ * hash-traits.h (int_hash_base): New struct, split out from... (int_hash): ...this class, which now inherits from int_hash_base. * hash-map-traits.h (unbounded_hashmap_traits): Take a template parameter for the key that provides hash and equality functions. (unbounded_int_hashmap_traits): Turn into a type alias of unbounded_hashmap_traits. |
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