3fe2ddae4b
PR libstdc++/77802
* testsuite/20_util/tuple/77802.cc: New.
Revert:
2016-09-21 Ville Voutilainen <ville.voutilainen@gmail.com>
Implement LWG 2729 for tuple.
* include/std/tuple (_Tuple_impl(_Tuple_impl&&)):
Suppress conditionally.
(_Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&&)): Likewise.
(__is_tuple_impl_trait_impl, __is_tuple_impl_trait): New.
(_Tuple_impl(const _Head&)): Constrain.
(_Tuple_impl(_UHead&&)): Likewise.
(_Tuple_impl(_Tuple_impl&&)): Suppress conditionally.
(_Tuple_impl(const _Tuple_impl<_Idx, _UHead>&)): Constrain.
(_Tuple_impl(_Tuple_impl<_Idx, _UHead>&&)): Likewise.
(operator=(const tuple&)): Enable conditionally.
(operator=(tuple&&)): Suppress conditionally.
(operator=(const tuple<_UElements...>&)): Constrain.
(operator=(tuple<_UElements...>&&)): Likewise.
(operator=(const tuple&)): Enable conditionally (2-param tuple).
(operator=(tuple&&)): Suppress conditionally (2-param tuple).
(operator=(const tuple<_U1, _U2>&)): Constrain.
(operator=(tuple<_U1, _U2>&&)): Likewise.
(operator=(const pair<_U1, _U2>&)): Likewise.
(operator=(pair<_U1, _U2>&&)): Likewise.
* testsuite/20_util/tuple/element_access/get_neg.cc: Adjust.
* testsuite/20_util/tuple/tuple_traits.cc: New.
From-SVN: r240709
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
// { dg-do compile { target c++11 } }
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// Copyright (C) 2016 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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#include <tuple>
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// This testcase instantiates a tuple with an incomplete type.
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// That is undefined behavior, but our tuple implementation manages
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// to cope with this particular case. The attempt to provide
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// a tuple implementation that yields the right result for
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// traits like is_copy_constructible and is_move_constructible as
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// per LWG 2729 results in ill-formed copy/move constructors being
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// generated for a tuple that contains an incomplete type.
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// Once we get concepts, we can solve that problem much easier.
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template <typename... Args> struct execution_context
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{
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typedef std::tuple<Args...> args_tpl_t;
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typedef std::tuple<execution_context, typename std::decay<Args>::type...>
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ret_tpl_t;
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execution_context();
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execution_context(execution_context &&);
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ret_tpl_t operator()() {
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args_tpl_t data;
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return tuple_cat(std::forward_as_tuple(execution_context()), data);
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}
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};
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void fn1()
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{
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execution_context<int> cc;
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cc();
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}
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