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GenProg.hh
1 /* ========================================================================= *
2 * *
3 * OpenMesh *
4 * Copyright (c) 2001-2015, RWTH-Aachen University *
5 * Department of Computer Graphics and Multimedia *
6 * All rights reserved. *
7 * www.openmesh.org *
8 * *
9 *---------------------------------------------------------------------------*
10 * This file is part of OpenMesh. *
11 *---------------------------------------------------------------------------*
12 * *
13 * Redistribution and use in source and binary forms, with or without *
14 * modification, are permitted provided that the following conditions *
15 * are met: *
16 * *
17 * 1. Redistributions of source code must retain the above copyright notice, *
18 * this list of conditions and the following disclaimer. *
19 * *
20 * 2. Redistributions in binary form must reproduce the above copyright *
21 * notice, this list of conditions and the following disclaimer in the *
22 * documentation and/or other materials provided with the distribution. *
23 * *
24 * 3. Neither the name of the copyright holder nor the names of its *
25 * contributors may be used to endorse or promote products derived from *
26 * this software without specific prior written permission. *
27 * *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
31 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
32 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
33 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
34 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
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38 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
39 * *
40 * ========================================================================= */
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Date$ *
46 * *
47 \*===========================================================================*/
48
49
50 //=============================================================================
51 //
52 // Utils for generic/generative programming
53 //
54 //=============================================================================
55
56 #ifndef OPENMESH_GENPROG_HH
57 #define OPENMESH_GENPROG_HH
58
59
60 //== INCLUDES =================================================================
61
62 #include <OpenMesh/Core/System/config.h>
63
64
65 //== NAMESPACES ===============================================================
66
67 namespace OpenMesh {
68
69 namespace GenProg {
70 #ifndef DOXY_IGNORE_THIS
71
72 //== IMPLEMENTATION ===========================================================
73
74
76 template <bool b> struct Bool2Type { enum { my_bool = b }; };
77
79 template <int i> struct Int2Type { enum { my_int = i }; };
80
82 typedef Bool2Type<true> TrueType;
83
85 typedef Bool2Type<false> FalseType;
86
87 //-----------------------------------------------------------------------------
89 template <bool Expr> struct AssertCompile;
90 template <> struct AssertCompile<true> {};
91
92
93
94 //--- Template "if" w/ partial specialization ---------------------------------
95 #if OM_PARTIAL_SPECIALIZATION
96
97
98 template <bool condition, class Then, class Else>
99 struct IF { typedef Then Result; };
100
106 template <class Then, class Else>
107 struct IF<false, Then, Else> { typedef Else Result; };
108
109
110
111
112
113 //--- Template "if" w/o partial specialization --------------------------------
114 #else
115
116
117 struct SelectThen
118 {
119 template <class Then, class Else> struct Select {
120 typedef Then Result;
121 };
122 };
123
124 struct SelectElse
125 {
126 template <class Then, class Else> struct Select {
127 typedef Else Result;
128 };
129 };
130
131 template <bool condition> struct ChooseSelector {
132 typedef SelectThen Result;
133 };
134
135 template <> struct ChooseSelector<false> {
136 typedef SelectElse Result;
137 };
138
139
146 template <bool condition, class Then, class Else>
147 class IF
148 {
149 typedef typename ChooseSelector<condition>::Result Selector;
150 public:
151 typedef typename Selector::template Select<Then, Else>::Result Result;
152 };
153
154 #endif
155
156 //=============================================================================
157 #endif
158 } // namespace GenProg
159 } // namespace OpenMesh
160
161 #define assert_compile(EXPR) GenProg::AssertCompile<(EXPR)>();
162
163 //=============================================================================
164 #endif // OPENMESH_GENPROG_HH defined
165 //=============================================================================
OpenMesh
Definition: MeshItems.hh:64
config.h