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952eaecfc6
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
31 lines
1.1 KiB
C++
31 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03
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// Test that the header `poisoned_hash_helper.hpp` doesn't include any
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// headers that provide hash<T> specializations. This is required so that the
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// 'test_library_hash_specializations_available()' function returns false
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// by default, unless a STL header providing hash has already been included.
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#include "poisoned_hash_helper.hpp"
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template <class T, size_t = sizeof(T)>
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constexpr bool is_complete_imp(int) { return true; }
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template <class> constexpr bool is_complete_imp(long) { return false; }
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template <class T> constexpr bool is_complete() { return is_complete_imp<T>(0); }
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template <class T> struct has_complete_hash {
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enum { value = is_complete<std::hash<T> >() };
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};
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int main() {
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static_assert(LibraryHashTypes::assertTrait<has_complete_hash, false>(), "");
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}
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