tr2/type_traits
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// TR2 <type_traits> -*- C++ -*-
// Copyright (C) 2011-2013 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)
{
namespace tr2
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @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.
/// Enumerate all the base classes of a class. Form of a typelist.
template<typename _Tp>
struct bases
{
typedef __reflection_typelist<__bases(_Tp)...> type;
};
/// 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;
};
/// @} group metaprogramming
_GLIBCXX_END_NAMESPACE_VERSION
}
}
#endif // _GLIBCXX_TR2_TYPE_TRAITS