Milena (Olena)  User documentation 2.0a Id
 All Classes Namespaces Functions Variables Typedefs Enumerator Groups Pages
bool.hh
1 // Copyright (C) 2007, 2008, 2009 EPITA Research and Development Laboratory (LRDE)
2 //
3 // This file is part of Olena.
4 //
5 // Olena is free software: you can redistribute it and/or modify it under
6 // the terms of the GNU General Public License as published by the Free
7 // Software Foundation, version 2 of the License.
8 //
9 // Olena is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 // General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License
15 // along with Olena. If not, see <http://www.gnu.org/licenses/>.
16 //
17 // As a special exception, you may use this file as part of a free
18 // software project without restriction. Specifically, if other files
19 // instantiate templates or use macros or inline functions from this
20 // file, or you compile this file and link it with other files to produce
21 // an executable, this file does not by itself cause the resulting
22 // executable to be covered by the GNU General Public License. This
23 // exception does not however invalidate any other reasons why the
24 // executable file might be covered by the GNU General Public License.
25 
26 #ifndef MLN_METAL_BOOL_HH
27 # define MLN_METAL_BOOL_HH
28 
32 
33 # include <string>
34 
35 
36 # define mlc_bool(B) mln::metal::bool_<( B )>
37 
38 // The macro above is very convenient for static checks on Boolean
39 // expressions, e.g., "mlc_bool(m == n)::check();"
40 
41 
42 
43 namespace mln
44 {
45 
46  namespace metal
47  {
48 
49  // Fwd decl.
50  template <bool b> struct bool_;
51 
52 
54  template <>
55  struct bool_< true >
56  {
57  typedef bool_<true> check_t;
58  static const bool value = true;
59  typedef bool_<true> eval;
60  static void check();
61  std::string name() const { return "true"; }
62  };
63 
64  typedef bool_<true> true_;
65 
66 
68  template <>
69  struct bool_< false >
70  {
71  typedef bool_<false> check_not_t;
72  static const bool value = false;
73  typedef bool_<false> eval;
74  static void check_not();
75  std::string name() const { return "false"; }
76  };
77 
78  typedef bool_<false> false_;
79 
80 
81 # ifndef MLN_INCLUDE_ONLY
82 
83  inline
84  void true_::check()
85  {
86  }
87 
88  inline
89  void false_::check_not()
90  {
91  }
92 
93 # endif // ! MLN_INCLUDE_ONLY
94 
95  } // end of namespace mln::metal
96 
97 } // end of namespace mln
98 
99 
100 # include <mln/metal/bexpr.hh>
101 
102 
103 #endif // ! MLN_METAL_BOOL_HH