core/enable_if.hpp
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1 // Boost enable_if library
2 
3 // Copyright 2003 (c) The Trustees of Indiana University.
4 
5 // Use, modification, and distribution is subject to the Boost Software
6 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
7 // http://www.boost.org/LICENSE_1_0.txt)
8 
9 // Authors: Jaakko Jarvi (jajarvi at osl.iu.edu)
10 // Jeremiah Willcock (jewillco at osl.iu.edu)
11 // Andrew Lumsdaine (lums at osl.iu.edu)
12 
13 
14 #ifndef BOOST_CORE_ENABLE_IF_HPP
15 #define BOOST_CORE_ENABLE_IF_HPP
16 
17 #include "boost/config.hpp"
18 
19 // Even the definition of enable_if causes problems on some compilers,
20 // so it's macroed out for all compilers that do not support SFINAE
21 
22 #ifndef BOOST_NO_SFINAE
23 
24 namespace boost
25 {
26 
27  template <bool B, class T = void>
28  struct enable_if_c {
29  typedef T type;
30  };
31 
32  template <class T>
33  struct enable_if_c<false, T> {};
34 
35  template <class Cond, class T = void>
36  struct enable_if : public enable_if_c<Cond::value, T> {};
37 
38  template <bool B, class T>
40  typedef typename T::type type;
41  };
42 
43  template <class T>
44  struct lazy_enable_if_c<false, T> {};
45 
46  template <class Cond, class T>
47  struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T> {};
48 
49 
50  template <bool B, class T = void>
51  struct disable_if_c {
52  typedef T type;
53  };
54 
55  template <class T>
56  struct disable_if_c<true, T> {};
57 
58  template <class Cond, class T = void>
59  struct disable_if : public disable_if_c<Cond::value, T> {};
60 
61  template <bool B, class T>
63  typedef typename T::type type;
64  };
65 
66  template <class T>
67  struct lazy_disable_if_c<true, T> {};
68 
69  template <class Cond, class T>
70  struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {};
71 
72 } // namespace boost
73 
74 #else
75 
76 namespace boost {
77 
78  namespace detail { typedef void enable_if_default_T; }
79 
80  template <typename T>
81  struct enable_if_does_not_work_on_this_compiler;
82 
83  template <bool B, class T = detail::enable_if_default_T>
84  struct enable_if_c : enable_if_does_not_work_on_this_compiler<T>
85  { };
86 
87  template <bool B, class T = detail::enable_if_default_T>
88  struct disable_if_c : enable_if_does_not_work_on_this_compiler<T>
89  { };
90 
91  template <bool B, class T = detail::enable_if_default_T>
92  struct lazy_enable_if_c : enable_if_does_not_work_on_this_compiler<T>
93  { };
94 
95  template <bool B, class T = detail::enable_if_default_T>
96  struct lazy_disable_if_c : enable_if_does_not_work_on_this_compiler<T>
97  { };
98 
99  template <class Cond, class T = detail::enable_if_default_T>
100  struct enable_if : enable_if_does_not_work_on_this_compiler<T>
101  { };
102 
103  template <class Cond, class T = detail::enable_if_default_T>
104  struct disable_if : enable_if_does_not_work_on_this_compiler<T>
105  { };
106 
107  template <class Cond, class T = detail::enable_if_default_T>
108  struct lazy_enable_if : enable_if_does_not_work_on_this_compiler<T>
109  { };
110 
111  template <class Cond, class T = detail::enable_if_default_T>
112  struct lazy_disable_if : enable_if_does_not_work_on_this_compiler<T>
113  { };
114 
115 } // namespace boost
116 
117 #endif // BOOST_NO_SFINAE
118 
119 #endif
BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE.
const char * detail
GLenum type


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Author(s): Sergey Dorodnicov , Doron Hirshberg , Mark Horn , Reagan Lopez , Itay Carpis
autogenerated on Mon May 3 2021 02:47:14