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libstdc++: cv bool can't be an integer-like type (LWG 3467)

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libstdc++-v3/ChangeLog:

	* include/bits/iterator_concepts.h (__detail::__cv_bool): New
	helper concept.
	(__detail::__integral_nonbool): Likewise.
	(__detail::__is_integer_like): Use __integral_nonbool.
	* testsuite/std/ranges/access/lwg3467.cc: New test.
This commit is contained in:
Jonathan Wakely 2020-07-30 12:23:55 +01:00
parent eeb45f8a41
commit 9e67b4356e
2 changed files with 40 additions and 1 deletions
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8
libstdc++-v3/include/bits/iterator_concepts.h
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@ -520,7 +520,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif
template<typename _Tp>
concept __is_integer_like = integral<_Tp>
concept __cv_bool = same_as<const volatile _Tp, const volatile bool>;
template<typename _Tp>
concept __integral_nonbool = integral<_Tp> && !__cv_bool<_Tp>;
template<typename _Tp>
concept __is_integer_like = __integral_nonbool<_Tp>
|| same_as<_Tp, __max_diff_type> || same_as<_Tp, __max_size_type>;
template<typename _Tp>

33
libstdc++-v3/testsuite/std/ranges/access/lwg3467.cc Normal file
View file

@ -0,0 +1,33 @@
// Copyright (C) 2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
// LWG 3467. bool can't be an integer-like type
#include <ranges>
struct R
{
bool size() const;
};
template<typename T>
concept sized = requires(T t) { std::ranges::size(t); };
static_assert( !sized<R> );