1 /* -*- C++ -*- |
1 /* -*- mode: C++; indent-tabs-mode: nil; -*- |
2 * |
2 * |
3 * This file is a part of LEMON, a generic C++ optimization library |
3 * This file is a part of LEMON, a generic C++ optimization library. |
4 * |
4 * |
5 * Copyright (C) 2003-2008 |
5 * Copyright (C) 2003-2008 |
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
7 * (Egervary Research Group on Combinatorial Optimization, EGRES). |
7 * (Egervary Research Group on Combinatorial Optimization, EGRES). |
8 * |
8 * |
81 /**************** dummy class to avoid ambiguity ****************/ |
81 /**************** dummy class to avoid ambiguity ****************/ |
82 |
82 |
83 template<int T> struct dummy { dummy(int) {} }; |
83 template<int T> struct dummy { dummy(int) {} }; |
84 |
84 |
85 /**************** enable_if from BOOST ****************/ |
85 /**************** enable_if from BOOST ****************/ |
86 |
86 |
87 template <typename Type, typename T = void> |
87 template <typename Type, typename T = void> |
88 struct exists { |
88 struct exists { |
89 typedef T type; |
89 typedef T type; |
90 }; |
90 }; |
91 |
91 |
92 |
92 |
93 template <bool B, class T = void> |
93 template <bool B, class T = void> |
94 struct enable_if_c { |
94 struct enable_if_c { |
95 typedef T type; |
95 typedef T type; |
96 }; |
96 }; |
97 |
97 |
98 template <class T> |
98 template <class T> |
99 struct enable_if_c<false, T> {}; |
99 struct enable_if_c<false, T> {}; |
100 |
100 |
101 template <class Cond, class T = void> |
101 template <class Cond, class T = void> |
102 struct enable_if : public enable_if_c<Cond::value, T> {}; |
102 struct enable_if : public enable_if_c<Cond::value, T> {}; |
103 |
103 |
104 template <bool B, class T> |
104 template <bool B, class T> |
105 struct lazy_enable_if_c { |
105 struct lazy_enable_if_c { |
106 typedef typename T::type type; |
106 typedef typename T::type type; |
107 }; |
107 }; |
108 |
108 |
109 template <class T> |
109 template <class T> |
110 struct lazy_enable_if_c<false, T> {}; |
110 struct lazy_enable_if_c<false, T> {}; |
111 |
111 |
112 template <class Cond, class T> |
112 template <class Cond, class T> |
113 struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T> {}; |
113 struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T> {}; |
114 |
114 |
115 |
115 |
116 template <bool B, class T = void> |
116 template <bool B, class T = void> |
117 struct disable_if_c { |
117 struct disable_if_c { |
119 }; |
119 }; |
120 |
120 |
121 template <class T> |
121 template <class T> |
122 struct disable_if_c<true, T> {}; |
122 struct disable_if_c<true, T> {}; |
123 |
123 |
124 template <class Cond, class T = void> |
124 template <class Cond, class T = void> |
125 struct disable_if : public disable_if_c<Cond::value, T> {}; |
125 struct disable_if : public disable_if_c<Cond::value, T> {}; |
126 |
126 |
127 template <bool B, class T> |
127 template <bool B, class T> |
128 struct lazy_disable_if_c { |
128 struct lazy_disable_if_c { |
129 typedef typename T::type type; |
129 typedef typename T::type type; |
130 }; |
130 }; |
131 |
131 |
132 template <class T> |
132 template <class T> |
133 struct lazy_disable_if_c<true, T> {}; |
133 struct lazy_disable_if_c<true, T> {}; |
134 |
134 |
135 template <class Cond, class T> |
135 template <class Cond, class T> |
136 struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {}; |
136 struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {}; |
137 |
137 |
138 } // namespace lemon |
138 } // namespace lemon |
139 |
139 |
140 #endif |
140 #endif |