Implement C++20 constexpr changes to std::pair (P1032R1)
* include/bits/stl_pair.h (pair): Add _GLIBCXX20_CONSTEXPR to piecewise construction constructor, assignment operators, and swap. * include/std/tuple (pair::pair(piecewise_construct_t, tuple, tuple)): Add _GLIBCXX20_CONSTEXPR. (pair::pair(tuple, tuple, _Index_tuple, _Index_tuple)): Likewise. * testsuite/20_util/pair/constexpr_assign.cc: New test. * testsuite/20_util/pair/constexpr_swap.cc: New test. From-SVN: r276154
This commit is contained in:
Jonathan Wakely
Jonathan Wakely
parent
d5f7e04923
commit
7a9942f521
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@ -1,5 +1,13 @@
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2019-09-26 Jonathan Wakely <jwakely@redhat.com>
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* include/bits/stl_pair.h (pair): Add _GLIBCXX20_CONSTEXPR to
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piecewise construction constructor, assignment operators, and swap.
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* include/std/tuple (pair::pair(piecewise_construct_t, tuple, tuple)):
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Add _GLIBCXX20_CONSTEXPR.
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(pair::pair(tuple, tuple, _Index_tuple, _Index_tuple)): Likewise.
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* testsuite/20_util/pair/constexpr_assign.cc: New test.
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* testsuite/20_util/pair/constexpr_swap.cc: New test.
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* include/experimental/internet (operator==, operator<): Fix loop
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condition to avoid reading past the end of the array.
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@ -380,9 +380,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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second(std::forward<_U2>(__p.second)) { }
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template<typename... _Args1, typename... _Args2>
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_GLIBCXX20_CONSTEXPR
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pair(piecewise_construct_t, tuple<_Args1...>, tuple<_Args2...>);
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pair&
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_GLIBCXX20_CONSTEXPR pair&
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operator=(typename conditional<
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__and_<is_copy_assignable<_T1>,
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is_copy_assignable<_T2>>::value,
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@ -393,7 +394,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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return *this;
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}
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pair&
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_GLIBCXX20_CONSTEXPR pair&
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operator=(typename conditional<
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__and_<is_move_assignable<_T1>,
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is_move_assignable<_T2>>::value,
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@ -407,9 +408,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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}
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template<typename _U1, typename _U2>
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typename enable_if<__and_<is_assignable<_T1&, const _U1&>,
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is_assignable<_T2&, const _U2&>>::value,
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pair&>::type
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_GLIBCXX20_CONSTEXPR
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typename enable_if<__and_<is_assignable<_T1&, const _U1&>,
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is_assignable<_T2&, const _U2&>>::value,
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pair&>::type
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operator=(const pair<_U1, _U2>& __p)
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{
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first = __p.first;
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@ -418,9 +420,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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}
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template<typename _U1, typename _U2>
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typename enable_if<__and_<is_assignable<_T1&, _U1&&>,
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is_assignable<_T2&, _U2&&>>::value,
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pair&>::type
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_GLIBCXX20_CONSTEXPR
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typename enable_if<__and_<is_assignable<_T1&, _U1&&>,
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is_assignable<_T2&, _U2&&>>::value,
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pair&>::type
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operator=(pair<_U1, _U2>&& __p)
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{
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first = std::forward<_U1>(__p.first);
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@ -429,7 +432,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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}
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/// Swap the first members and then the second members.
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void
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_GLIBCXX20_CONSTEXPR void
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swap(pair& __p)
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noexcept(__and_<__is_nothrow_swappable<_T1>,
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__is_nothrow_swappable<_T2>>::value)
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@ -442,6 +445,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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private:
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template<typename... _Args1, std::size_t... _Indexes1,
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typename... _Args2, std::size_t... _Indexes2>
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_GLIBCXX20_CONSTEXPR
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pair(tuple<_Args1...>&, tuple<_Args2...>&,
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_Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
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#endif
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@ -503,7 +507,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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* which has performance implications, e.g. see https://gcc.gnu.org/PR38466
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*/
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template<typename _T1, typename _T2>
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inline
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_GLIBCXX20_CONSTEXPR inline
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#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
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// Constrained free swap overload, see p0185r1
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typename enable_if<__and_<__is_swappable<_T1>,
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@ -1570,7 +1570,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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*/
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template<class _T1, class _T2>
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template<typename... _Args1, typename... _Args2>
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inline
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_GLIBCXX20_CONSTEXPR inline
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pair<_T1, _T2>::
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pair(piecewise_construct_t,
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tuple<_Args1...> __first, tuple<_Args2...> __second)
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@ -1582,7 +1582,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<class _T1, class _T2>
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template<typename... _Args1, std::size_t... _Indexes1,
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typename... _Args2, std::size_t... _Indexes2>
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inline
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_GLIBCXX20_CONSTEXPR inline
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pair<_T1, _T2>::
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pair(tuple<_Args1...>& __tuple1, tuple<_Args2...>& __tuple2,
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_Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>)
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@ -0,0 +1,39 @@
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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++2a" }
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// { dg-do compile { target c++2a } }
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#include <utility>
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#include <tuple>
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constexpr int
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test01(int i, int j)
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{
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using T = std::tuple<int>;
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std::pair<int, int> p0, p1, p2, p3;
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std::pair<int, int> pij(std::piecewise_construct, T(i), T(j));
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p0 = pij;
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p1 = std::move(pij);
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std::pair<long, long> pijl(i, j);
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p2 = pijl;
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p3 = std::move(pijl);
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return p0.first + p0.second + p1.first + p1.second
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+ p2.first + p2.second + p3.first + p3.second;
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}
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static_assert( test01(3, 100) == 412 );
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@ -0,0 +1,36 @@
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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++2a" }
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// { dg-do compile { target c++2a } }
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#include <utility>
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#include <tuple>
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constexpr int
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test01(int i, int j)
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{
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using T = std::tuple<int>;
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std::pair<int, int> p0, p1;
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std::pair<int, int> pij(std::piecewise_construct, T(i), T(j));
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std::pair<int, int> pji(std::piecewise_construct, T(j), T(i));
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p0.swap(pij);
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swap(p1, pji);
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return p0.first - p0.second - p1.first + p1.second;
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}
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static_assert( test01(5, 100) == -190 );
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