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PR libstdc++/83395 fix invocable traits for INVOKE<cv void>

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PR libstdc++/83395
	* include/std/type_traits (__is_invocable_impl): Remove partial
	specialization for INVOKE<void> and restore is_void<R> check in
	primary template.
	(__is_nt_invocable_impl): Likewise.
	* testsuite/20_util/is_invocable/83395.cc: New test.
	* testsuite/20_util/is_nothrow_invocable/83395.cc: New test.

From-SVN: r255585
This commit is contained in:
Jonathan Wakely 2017-12-12 18:07:24 +00:00 committed by Jonathan Wakely
parent d712665521
commit 4fb43923ef
4 changed files with 70 additions and 14 deletions
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10
libstdc++-v3/ChangeLog
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@ -1,3 +1,13 @@
2017-12-12 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/83395
* include/std/type_traits (__is_invocable_impl): Remove partial
specialization for INVOKE<void> and restore is_void<R> check in
primary template.
(__is_nt_invocable_impl): Likewise.
* testsuite/20_util/is_invocable/83395.cc: New test.
* testsuite/20_util/is_nothrow_invocable/83395.cc: New test.
2017-12-01 Jonathan Wakely <jwakely@redhat.com>
Backport from mainline

18
libstdc++-v3/include/std/type_traits
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@ -2755,12 +2755,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Result, typename _Ret>
struct __is_invocable_impl<_Result, _Ret, __void_t<typename _Result::type>>
: is_convertible<typename _Result::type, _Ret>::type
{ };
template<typename _Result>
struct __is_invocable_impl<_Result, void, __void_t<typename _Result::type>>
: true_type
: __or_<is_void<_Ret>, is_convertible<typename _Result::type, _Ret>>::type
{ };
template<typename _Fn, typename... _ArgTypes>
@ -2865,14 +2860,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Result, typename _Ret>
struct __is_nt_invocable_impl<_Result, _Ret,
__void_t<typename _Result::type>>
: __and_<is_convertible<typename _Result::type, _Ret>,
is_nothrow_constructible<_Ret, typename _Result::type>>
{ };
template<typename _Result>
struct __is_nt_invocable_impl<_Result, void,
__void_t<typename _Result::type>>
: true_type
: __or_<is_void<_Ret>,
__and_<is_convertible<typename _Result::type, _Ret>,
is_nothrow_constructible<_Ret, typename _Result::type>>>
{ };
/// std::is_nothrow_invocable_r

28
libstdc++-v3/testsuite/20_util/is_invocable/83395.cc Normal file
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@ -0,0 +1,28 @@
// Copyright (C) 2017 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++17" }
// { dg-do compile { target c++1z } }
#include <type_traits>
// PR libstdc++/83395
using F = int(*)();
static_assert(std::is_invocable_r<void, F>::value);
static_assert(std::is_invocable_r<void const, F>::value);
static_assert(std::is_invocable_r<void volatile, F>::value);
static_assert(std::is_invocable_r<void const volatile, F>::value);

28
libstdc++-v3/testsuite/20_util/is_nothrow_invocable/83395.cc Normal file
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@ -0,0 +1,28 @@
// Copyright (C) 2017 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++17" }
// { dg-do compile { target c++1z } }
#include <type_traits>
// PR libstdc++/83395
using F = int(*)() noexcept;
static_assert(std::is_nothrow_invocable_r<void, F>::value);
static_assert(std::is_nothrow_invocable_r<void const, F>::value);
static_assert(std::is_nothrow_invocable_r<void volatile, F>::value);
static_assert(std::is_nothrow_invocable_r<void const volatile, F>::value);