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GenProg.hh
1 /*===========================================================================*\
2 * *
3 * OpenMesh *
4 * Copyright (C) 2001-2012 by Computer Graphics Group, RWTH Aachen *
5 * www.openmesh.org *
6 * *
7 *---------------------------------------------------------------------------*
8 * This file is part of OpenMesh. *
9 * *
10 * OpenMesh is free software: you can redistribute it and/or modify *
11 * it under the terms of the GNU Lesser General Public License as *
12 * published by the Free Software Foundation, either version 3 of *
13 * the License, or (at your option) any later version with the *
14 * following exceptions: *
15 * *
16 * If other files instantiate templates or use macros *
17 * or inline functions from this file, or you compile this file and *
18 * link it with other files to produce an executable, this file does *
19 * not by itself cause the resulting executable to be covered by the *
20 * GNU Lesser General Public License. This exception does not however *
21 * invalidate any other reasons why the executable file might be *
22 * covered by the GNU Lesser General Public License. *
23 * *
24 * OpenMesh is distributed in the hope that it will be useful, *
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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27 * GNU Lesser General Public License for more details. *
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33 \*===========================================================================*/
34
35 /*===========================================================================*\
36 * *
37 * $Revision: 736 $ *
38 * $Date: 2012-10-08 09:30:49 +0200 (Mo, 08 Okt 2012) $ *
39 * *
40 \*===========================================================================*/
41
42
43 //=============================================================================
44 //
45 // Utils for generic/generative programming
46 //
47 //=============================================================================
48
49 #ifndef OPENMESH_GENPROG_HH
50 #define OPENMESH_GENPROG_HH
51
52
53 //== INCLUDES =================================================================
54
55 #include <OpenMesh/Core/System/config.h>
56
57
58 //== NAMESPACES ===============================================================
59
60 namespace OpenMesh {
61
62 namespace GenProg {
63 #ifndef DOXY_IGNORE_THIS
64
65 //== IMPLEMENTATION ===========================================================
66
67
69 template <bool b> struct Bool2Type { enum { my_bool = b }; };
70
72 template <int i> struct Int2Type { enum { my_int = i }; };
73
75 typedef Bool2Type<true> True;
76
78 typedef Bool2Type<false> False;
79
80 //-----------------------------------------------------------------------------
82 template <bool Expr> struct AssertCompile;
83 template <> struct AssertCompile<true> {};
84
85
86
87 //--- Template "if" w/ partial specialization ---------------------------------
88 #if OM_PARTIAL_SPECIALIZATION
89
90
91 template <bool condition, class Then, class Else>
92 struct IF { typedef Then Result; };
93
99 template <class Then, class Else>
100 struct IF<false, Then, Else> { typedef Else Result; };
101
102
103
104
105
106 //--- Template "if" w/o partial specialization --------------------------------
107 #else
108
109
110 struct SelectThen
111 {
112 template <class Then, class Else> struct Select {
113 typedef Then Result;
114 };
115 };
116
117 struct SelectElse
118 {
119 template <class Then, class Else> struct Select {
120 typedef Else Result;
121 };
122 };
123
124 template <bool condition> struct ChooseSelector {
125 typedef SelectThen Result;
126 };
127
128 template <> struct ChooseSelector<false> {
129 typedef SelectElse Result;
130 };
131
132
139 template <bool condition, class Then, class Else>
140 class IF
141 {
142 typedef typename ChooseSelector<condition>::Result Selector;
143 public:
144 typedef typename Selector::template Select<Then, Else>::Result Result;
145 };
146
147 #endif
148
149 //=============================================================================
150 #endif
151 } // namespace GenProg
152 } // namespace OpenMesh
153
154 #define assert_compile(EXPR) GenProg::AssertCompile<(EXPR)>();
155
156 //=============================================================================
157 #endif // OPENMESH_GENPROG_HH defined
158 //=============================================================================