1// -*- C++ -*- 2 3// Copyright (C) 2005 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 2, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// You should have received a copy of the GNU General Public License along 17// with this library; see the file COPYING. If not, write to the Free 18// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19// USA. 20 21// As a special exception, you may use this file as part of a free software 22// library without restriction. Specifically, if other files instantiate 23// templates or use macros or inline functions from this file, or you compile 24// this file and link it with other files to produce an executable, this 25// file does not by itself cause the resulting executable to be covered by 26// the GNU General Public License. This exception does not however 27// invalidate any other reasons why the executable file might be covered by 28// the GNU General Public License. 29 30// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 31 32// Permission to use, copy, modify, sell, and distribute this software 33// is hereby granted without fee, provided that the above copyright 34// notice appears in all copies, and that both that copyright notice and 35// this permission notice appear in supporting documentation. None of 36// the above authors, nor IBM Haifa Research Laboratories, make any 37// representation about the suitability of this software for any 38// purpose. It is provided "as is" without express or implied warranty. 39 40/** 41 * @file typelist_contains.hpp 42 * Contains typelist utilities. 43 * Typelists are an idea by Andrei Alexandrescu. 44 */ 45 46#ifndef TYPELIST_CONTAINS_HPP 47#define TYPELIST_CONTAINS_HPP 48 49#ifdef _MSC_VER 50#pragma warning(disable: 4503) 51#endif // #ifdef _MSC_VER 52 53#include <ext/pb_assoc/detail/type_utils.hpp> 54 55namespace detail 56{ 57 58 template<class Typelist_Chain, class T> 59 struct typelist_contains_; 60 61 template<class T> 62 struct typelist_contains_< 63 null_type, 64 T> 65 { 66 enum 67 { 68 value = false 69 }; 70 }; 71 72 template<class Hd, class Tl, class T> 73 struct typelist_contains_< 74 typelist_chain<Hd, Tl>, 75 T> 76 { 77 enum 78 { 79 value = 80 typelist_contains_< 81 Tl, T>::value 82 }; 83 }; 84 85 template<class Tl, class T> 86 struct typelist_contains_< 87 typelist_chain<T, Tl>, 88 T> 89 { 90 enum 91 { 92 value = true 93 }; 94 }; 95 96} // namespace detail 97 98#endif // #ifndef TYPELIST_CONTAINS_HPP 99 100