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Implement P0513R0 - "Poisoning the Hash"

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Summary:
Exactly what the title says.

This patch also adds a `std::hash<nullptr_t>` specialization in C++17, but it was not added by this paper and I can't find the actual paper that adds it.

See http://wg21.link/P0513R0 for more info.

If there are no comments in the next couple of days I'll commit this

Reviewers: mclow.lists, K-ballo, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D28938

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@292684 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-01-21 00:02:12 +00:00
parent ee856f131d
commit 952eaecfc6
31 changed files with 1470 additions and 653 deletions
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21
test/std/utilities/optional/optional.hash/hash.pass.cpp
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@@ -17,6 +17,15 @@
#include <memory>
#include <cassert>
#include "poisoned_hash_helper.hpp"
struct A {};
struct B {};
template <>
struct std::hash<B> {
size_t operator()(B const&) { return 0; }
};
int main()
{
@@ -45,4 +54,16 @@ int main()
opt = std::unique_ptr<int>(new int(3));
assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
}
{
test_hash_enabled_for_type<std::optional<int> >();
test_hash_enabled_for_type<std::optional<int*> >();
test_hash_enabled_for_type<std::optional<const int> >();
test_hash_enabled_for_type<std::optional<int* const> >();
test_hash_disabled_for_type<std::optional<A>>();
test_hash_disabled_for_type<std::optional<const A>>();
test_hash_enabled_for_type<std::optional<B>>();
test_hash_enabled_for_type<std::optional<const B>>();
}
}