1*38fd1498Szrj// TR2 <type_traits> -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj// Copyright (C) 2011-2018 Free Software Foundation, Inc. 4*38fd1498Szrj// 5*38fd1498Szrj// This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj// software; you can redistribute it and/or modify it under the 7*38fd1498Szrj// terms of the GNU General Public License as published by the 8*38fd1498Szrj// Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj// any later version. 10*38fd1498Szrj 11*38fd1498Szrj// This library is distributed in the hope that it will be useful, 12*38fd1498Szrj// but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj// GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj// Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj// permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj// 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj// You should have received a copy of the GNU General Public License and 21*38fd1498Szrj// a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj// <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj/** @file tr2/type_traits 26*38fd1498Szrj * This is a TR2 C++ Library header. 27*38fd1498Szrj */ 28*38fd1498Szrj 29*38fd1498Szrj#ifndef _GLIBCXX_TR2_TYPE_TRAITS 30*38fd1498Szrj#define _GLIBCXX_TR2_TYPE_TRAITS 1 31*38fd1498Szrj 32*38fd1498Szrj#pragma GCC system_header 33*38fd1498Szrj#include <type_traits> 34*38fd1498Szrj#include <bits/c++config.h> 35*38fd1498Szrj 36*38fd1498Szrjnamespace std _GLIBCXX_VISIBILITY(default) 37*38fd1498Szrj{ 38*38fd1498Szrj_GLIBCXX_BEGIN_NAMESPACE_VERSION 39*38fd1498Szrj 40*38fd1498Szrjnamespace tr2 41*38fd1498Szrj{ 42*38fd1498Szrj /** 43*38fd1498Szrj * @addtogroup metaprogramming 44*38fd1498Szrj * @{ 45*38fd1498Szrj */ 46*38fd1498Szrj 47*38fd1498Szrj /** 48*38fd1498Szrj * See N2965: Type traits and base classes 49*38fd1498Szrj * by Michael Spertus 50*38fd1498Szrj */ 51*38fd1498Szrj 52*38fd1498Szrj /** 53*38fd1498Szrj * Simple typelist. Compile-time list of types. 54*38fd1498Szrj */ 55*38fd1498Szrj template<typename... _Elements> 56*38fd1498Szrj struct __reflection_typelist; 57*38fd1498Szrj 58*38fd1498Szrj /// Specialization for an empty typelist. 59*38fd1498Szrj template<> 60*38fd1498Szrj struct __reflection_typelist<> 61*38fd1498Szrj { 62*38fd1498Szrj typedef std::true_type empty; 63*38fd1498Szrj }; 64*38fd1498Szrj 65*38fd1498Szrj /// Partial specialization. 66*38fd1498Szrj template<typename _First, typename... _Rest> 67*38fd1498Szrj struct __reflection_typelist<_First, _Rest...> 68*38fd1498Szrj { 69*38fd1498Szrj typedef std::false_type empty; 70*38fd1498Szrj 71*38fd1498Szrj struct first 72*38fd1498Szrj { 73*38fd1498Szrj typedef _First type; 74*38fd1498Szrj }; 75*38fd1498Szrj 76*38fd1498Szrj struct rest 77*38fd1498Szrj { 78*38fd1498Szrj typedef __reflection_typelist<_Rest...> type; 79*38fd1498Szrj }; 80*38fd1498Szrj }; 81*38fd1498Szrj 82*38fd1498Szrj /// Sequence abstraction metafunctions for manipulating a typelist. 83*38fd1498Szrj 84*38fd1498Szrj 85*38fd1498Szrj 86*38fd1498Szrj /// Enumerate all the base classes of a class. Form of a typelist. 87*38fd1498Szrj template<typename _Tp> 88*38fd1498Szrj struct bases 89*38fd1498Szrj { 90*38fd1498Szrj typedef __reflection_typelist<__bases(_Tp)...> type; 91*38fd1498Szrj }; 92*38fd1498Szrj 93*38fd1498Szrj /// Enumerate all the direct base classes of a class. Form of a typelist. 94*38fd1498Szrj template<typename _Tp> 95*38fd1498Szrj struct direct_bases 96*38fd1498Szrj { 97*38fd1498Szrj typedef __reflection_typelist<__direct_bases(_Tp)...> type; 98*38fd1498Szrj }; 99*38fd1498Szrj 100*38fd1498Szrj /// @} group metaprogramming 101*38fd1498Szrj} 102*38fd1498Szrj 103*38fd1498Szrj_GLIBCXX_END_NAMESPACE_VERSION 104*38fd1498Szrj} 105*38fd1498Szrj 106*38fd1498Szrj#endif // _GLIBCXX_TR2_TYPE_TRAITS 107