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0f8261eae0
This patch addresses a difference between the hash function and the equality function for canonical types of template parameters (ctp_hasher). The equality function uses comptypes (typeck.cc) (with COMPARE_STRUCTURAL) and checks constraint equality for two auto nodes (typeck.cc:1586), while the hash function ignores it (pt.cc:4528). This leads to hash collisions that can be avoided by using `hash_placeholder_constraint` (constraint.cc:1150). Note that due to the proper handling of hash collisions (hash-table.h:1059), there is no test case that can distinguish the current implementation from the proposed one. * constraint.cc (hash_placeholder_constraint): Rename to iterative_hash_placeholder_constraint. (iterative_hash_placeholder_constraint): Rename from hash_placeholder_constraint and add the initial val argument. * cp-tree.h (hash_placeholder_constraint): Rename to iterative_hash_placeholder_constraint. (iterative_hash_placeholder_constraint): Renamed from hash_placeholder_constraint and add the initial val argument. * pt.cc (struct ctp_hasher): Updated to use iterative_hash_placeholder_constraint in the case of a valid placeholder constraint. (auto_hash::hash): Reflect the renaming of hash_placeholder_constraint to iterative_hash_placeholder_constraint. |
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