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Commit 4718430a authored by Chandler Carruth's avatar Chandler Carruth
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Add support for hashing pairs by delegating to each sub-object. There is

an open question of whether we can do better than this by treating pairs
as boring data containers and directly hashing the two subobjects. This
at least makes the API reasonable.

In order to make this change, I reorganized the header a bit. I lifted
the declarations of the hash_value functions up to the top of the header
with their doxygen comments as these are intended for users to interact
with. They shouldn't have to wade through implementation details. I then
defined them at the very end so that they could be defined in terms of
hash_combine or any other hashing infrastructure.

Added various pair-hashing unittests.

llvm-svn: 151882
parent 35ecb36f
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