PR libstdc++/88802 define std::hash<nullptr_t> for C++17
PR libstdc++/88802 * include/bits/functional_hash.h (hash<nullptr_t>): Define specialization for C++17 (P0513R0, LWG 2817). * testsuite/20_util/hash/nullptr.cc: New test. From-SVN: r267845
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2019-01-11 Jonathan Wakely <jwakely@redhat.com>
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2019-01-11 Jonathan Wakely <jwakely@redhat.com>
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PR libstdc++/88802
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* include/bits/functional_hash.h (hash<nullptr_t>): Define
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specialization for C++17 (P0513R0, LWG 2817).
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* testsuite/20_util/hash/nullptr.cc: New test.
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PR libstdc++/88125
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PR libstdc++/88125
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* config/abi/pre/gnu.ver (GLIBCXX_3.4.6): Remove unused duplicate
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* config/abi/pre/gnu.ver (GLIBCXX_3.4.6): Remove unused duplicate
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pattern for std::basic_stringbuf::str().
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pattern for std::basic_stringbuf::str().
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@ -254,6 +254,16 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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operator()(long double __val) const noexcept;
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operator()(long double __val) const noexcept;
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};
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};
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#if __cplusplus >= 201703L
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template<>
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struct hash<nullptr_t> : public __hash_base<size_t, nullptr_t>
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{
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size_t
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operator()(nullptr_t) const noexcept
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{ return 0; }
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};
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#endif
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// @} group hashes
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// @} group hashes
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// Hint about performance of hash functor. If not fast the hash-based
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// Hint about performance of hash functor. If not fast the hash-based
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// Copyright (C) 2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-options "-std=gnu++17" }
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// { dg-do run { target c++17 } }
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#include <functional>
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#include <testsuite_hooks.h>
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void
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test01()
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{
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auto h1 = std::hash<std::nullptr_t>{}(nullptr);
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static_assert(std::is_same_v<decltype(h1), std::size_t>);
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auto h2 = std::hash<std::nullptr_t>{}(nullptr);
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VERIFY( h1 == h2 );
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}
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int
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main()
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{
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test01();
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}
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