OpenMesh: OpenMesh/Core/Utils/GenProg.hh Source File

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GenProg.hh
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42 /*===========================================================================*\
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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
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:64