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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
36 lines
952 B
C++
36 lines
952 B
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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//
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// UNSUPPORTED: libcpp-has-no-threads
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// <thread>
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// template <class T>
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// struct hash
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// : public unary_function<T, size_t>
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// {
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// size_t operator()(T val) const;
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// };
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// Not very portable
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#include <thread>
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#include <cassert>
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int main()
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{
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std::thread::id id1;
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std::thread::id id2 = std::this_thread::get_id();
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typedef std::hash<std::thread::id> H;
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static_assert((std::is_same<typename H::argument_type, std::thread::id>::value), "" );
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static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
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H h;
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assert(h(id1) != h(id2));
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}
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