1 // -*- C++ -*- 2 3 // Copyright (C) 2005, 2006 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 terms 7 // of the GNU General Public License as published by the Free Software 8 // Foundation; either version 2, or (at your option) any later 9 // version. 10 11 // This library is distributed in the hope that it will be useful, but 12 // WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 // General Public License for more details. 15 16 // You should have received a copy of the GNU General Public License 17 // along with this library; see the file COPYING. If not, write to 18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19 // MA 02111-1307, USA. 20 21 // As a special exception, you may use this file as part of a free 22 // software library without restriction. Specifically, if other files 23 // instantiate templates or use macros or inline functions from this 24 // file, or you compile this file and link it with other files to 25 // produce an executable, this file does not by itself cause the 26 // resulting executable to be covered by the GNU General Public 27 // License. This exception does not however invalidate any other 28 // reasons why the executable file might be covered by the GNU General 29 // Public License. 30 31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32 33 // Permission to use, copy, modify, sell, and distribute this software 34 // is hereby granted without fee, provided that the above copyright 35 // notice appears in all copies, and that both that copyright notice 36 // and this permission notice appear in supporting documentation. None 37 // of the above authors, nor IBM Haifa Research Laboratories, make any 38 // representation about the suitability of this software for any 39 // purpose. It is provided "as is" without express or implied 40 // warranty. 41 42 /** 43 * @file type_utils.hpp 44 * Contains utilities for handnling types. All of these classes are based on 45 * "Modern C++" by Andrei Alxandrescu. 46 */ 47 48 #ifndef PB_DS_TYPE_UTILS_HPP 49 #define PB_DS_TYPE_UTILS_HPP 50 51 #include <cstddef> 52 #include <utility> 53 #include <tr1/type_traits> 54 #include <ext/type_traits.h> 55 #include <ext/numeric_traits.h> 56 57 namespace pb_ds 58 { 59 namespace detail 60 { 61 using std::tr1::is_same; 62 using std::tr1::is_const; 63 using std::tr1::is_pointer; 64 using std::tr1::is_reference; 65 using std::tr1::is_fundamental; 66 using std::tr1::is_member_object_pointer; 67 using std::tr1::is_member_pointer; 68 using std::tr1::is_base_of; 69 using std::tr1::remove_const; 70 using std::tr1::remove_reference; 71 72 // Need integral_const<bool, true> <-> integral_const<int, 1>, so 73 // because of this use the following typedefs instead of importing 74 // std::tr1's. 75 using std::tr1::integral_constant; 76 typedef std::tr1::integral_constant<int, 1> true_type; 77 typedef std::tr1::integral_constant<int, 0> false_type; 78 79 using __gnu_cxx::__conditional_type; 80 using __gnu_cxx::__numeric_traits; 81 82 template<typename T> 83 struct is_const_pointer 84 { 85 enum 86 { 87 value = is_const<T>::value && is_pointer<T>::value 88 }; 89 }; 90 91 template<typename T> 92 struct is_const_reference 93 { 94 enum 95 { 96 value = is_const<T>::value && is_reference<T>::value 97 }; 98 }; 99 100 template<typename T> 101 struct is_simple 102 { 103 enum 104 { 105 value = is_fundamental<typename remove_const<T>::type>::value 106 || is_pointer<typename remove_const<T>::type>::value 107 || is_member_pointer<T>::value 108 }; 109 }; 110 111 template<typename T> 112 class is_pair 113 { 114 private: 115 template<typename U> 116 struct is_pair_imp 117 { 118 enum 119 { 120 value = 0 121 }; 122 }; 123 124 template<typename U, typename V> 125 struct is_pair_imp<std::pair<U,V> > 126 { 127 enum 128 { 129 value = 1 130 }; 131 }; 132 133 public: 134 enum 135 { 136 value = is_pair_imp<T>::value 137 }; 138 }; 139 140 141 template<bool> 142 struct static_assert; 143 144 template<> 145 struct static_assert<true> 146 { }; 147 148 template<int> 149 struct static_assert_dumclass 150 { 151 enum 152 { 153 v = 1 154 }; 155 }; 156 157 template<typename Type> 158 struct type_to_type 159 { 160 typedef Type type; 161 }; 162 } // namespace detail 163 } // namespace pb_ds 164 165 #endif 166