tr2/type_traits
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// TR2 <type_traits> -*- C++ -*-
// Copyright (C) 2011-2024 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file tr2/type_traits
* This is a TR2 C++ Library header.
*/
#ifndef _GLIBCXX_TR2_TYPE_TRAITS
#define _GLIBCXX_TR2_TYPE_TRAITS 1
#pragma GCC system_header
#include <type_traits>
#include <bits/c++config.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace tr2
{
/**
* @addtogroup metaprogramming
* @{
*/
/**
* See N2965: Type traits and base classes
* by Michael Spertus
*/
/**
* Simple typelist. Compile-time list of types.
*/
template<typename... _Elements>
struct __reflection_typelist;
/// Specialization for an empty typelist.
template<>
struct __reflection_typelist<>
{
typedef std::true_type empty;
};
/// Partial specialization.
template<typename _First, typename... _Rest>
struct __reflection_typelist<_First, _Rest...>
{
typedef std::false_type empty;
struct first
{
typedef _First type;
};
struct rest
{
typedef __reflection_typelist<_Rest...> type;
};
};
/// Sequence abstraction metafunctions for manipulating a typelist.
#if __has_builtin(__bases)
/// Enumerate all the base classes of a class. Form of a typelist.
template<typename _Tp>
struct bases
{
typedef __reflection_typelist<__bases(_Tp)...> type;
};
#endif
#if __has_builtin(__direct_bases)
/// Enumerate all the direct base classes of a class. Form of a typelist.
template<typename _Tp>
struct direct_bases
{
typedef __reflection_typelist<__direct_bases(_Tp)...> type;
};
#endif
/// @} group metaprogramming
}
_GLIBCXX_END_NAMESPACE_VERSION
}
#endif // _GLIBCXX_TR2_TYPE_TRAITS
c++config.h
std::true_type
__bool_constant< true > true_type
The type used as a compile-time boolean with true value.
Definition type_traits:111
std::false_type
__bool_constant< false > false_type
The type used as a compile-time boolean with false value.
Definition type_traits:114
std
ISO C++ entities toplevel namespace is std.
std::tr2
Namespace for non-standard "TR2" extensions.
std::type
std::tr2::__reflection_typelist
Definition tr2/type_traits:56
std::tr2::bases
Sequence abstraction metafunctions for manipulating a typelist.
Definition tr2/type_traits:89
std::tr2::direct_bases
Enumerate all the direct base classes of a class. Form of a typelist.
Definition tr2/type_traits:98
type_traits