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Define std::endian for C++2a (P0463R1)

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* include/std/type_traits (endian): Define new enumeration type.
	* testsuite/20_util/endian/1.cc: New test.

From-SVN: r254381
This commit is contained in:
Jonathan Wakely 2017-11-03 15:45:49 +00:00 • committed by Jonathan Wakely
parent d04814543c
commit e641ee437f
3 changed files with 51 additions and 2 deletions
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3
libstdc++-v3/ChangeLog
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@ -1,5 +1,8 @@
2017-11-03 Jonathan Wakely <jwakely@redhat.com>
* include/std/type_traits (endian): Define new enumeration type.
* testsuite/20_util/endian/1.cc: New test.
* include/bits/node_handle.h (_Node_insert_return::get): Remove, as
per P0508R0.

14
libstdc++-v3/include/std/type_traits
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@ -2664,7 +2664,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
void operator=(__nonesuch const&) = delete;
};
#if __cplusplus > 201402L
#if __cplusplus >= 201703L
# define __cpp_lib_is_invocable 201703
/// std::invoke_result
@ -2739,7 +2739,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
= is_nothrow_invocable_r<_Fn, _Args...>::value;
#endif // C++17
#if __cplusplus > 201402L
#if __cplusplus >= 201703L
# define __cpp_lib_type_trait_variable_templates 201510L
template <typename _Tp>
inline constexpr bool is_void_v = is_void<_Tp>::value;
@ -2943,6 +2943,16 @@ template <typename _From, typename _To>
#endif // C++17
#if __cplusplus > 201703L
/// Byte order
enum class endian
{
little = __ORDER_LITTLE_ENDIAN__,
big = __ORDER_BIG_ENDIAN__,
native = __BYTE_ORDER__
};
#endif // C++2a
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

36
libstdc++-v3/testsuite/20_util/endian/1.cc Normal file
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@ -0,0 +1,36 @@
// 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++2a" }
// { dg-do compile { target c++2a } }
#include <type_traits>
static_assert( std::is_enum_v<std::endian> );
static_assert( std::endian::little != std::endian::big );
static_assert( std::endian::native == std::endian::big
|| std::endian::native == std::endian::little );
namespace gnu {
int little, big, native;
}
using namespace std;
using namespace gnu;
// std::endian is a scoped-enum so these should refer to gnu::native etc.
int test = little + big + native;