Developer Documentation

GenProg.hh
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41
42
43
44
45 //=============================================================================
46 //
47 // Utils for generic/generative programming
48 //
49 //=============================================================================
50
51 #ifndef OPENMESH_GENPROG_HH
52 #define OPENMESH_GENPROG_HH
53
54
55 //== INCLUDES =================================================================
56
57 #include <OpenMesh/Core/System/config.h>
58
59
60 //== NAMESPACES ===============================================================
61
62 namespace OpenMesh {
63
64 namespace GenProg {
65 #ifndef DOXY_IGNORE_THIS
66
67 //== IMPLEMENTATION ===========================================================
68
69
71 template <bool b> struct Bool2Type { enum { my_bool = b }; };
72
74 template <int i> struct Int2Type { enum { my_int = i }; };
75
77 typedef Bool2Type<true> TrueType;
78
80 typedef Bool2Type<false> FalseType;
81
82 //-----------------------------------------------------------------------------
84 template <bool Expr> struct AssertCompile;
85 template <> struct AssertCompile<true> {};
86
87
88
89 //--- Template "if" w/ partial specialization ---------------------------------
90 #if OM_PARTIAL_SPECIALIZATION
91
92
93 template <bool condition, class Then, class Else>
94 struct IF { typedef Then Result; };
95
101 template <class Then, class Else>
102 struct IF<false, Then, Else> { typedef Else Result; };
103
104
105
106
107
108 //--- Template "if" w/o partial specialization --------------------------------
109 #else
110
111
112 struct SelectThen
113 {
114 template <class Then, class Else> struct Select {
115 typedef Then Result;
116 };
117 };
118
119 struct SelectElse
120 {
121 template <class Then, class Else> struct Select {
122 typedef Else Result;
123 };
124 };
125
126 template <bool condition> struct ChooseSelector {
127 typedef SelectThen Result;
128 };
129
130 template <> struct ChooseSelector<false> {
131 typedef SelectElse Result;
132 };
133
134
141 template <bool condition, class Then, class Else>
142 class IF
143 {
144 typedef typename ChooseSelector<condition>::Result Selector;
145 public:
146 typedef typename Selector::template Select<Then, Else>::Result Result;
147 };
148
149 #endif
150
151 //=============================================================================
152 #endif
153 } // namespace GenProg
154 } // namespace OpenMesh
155
156 #define assert_compile(EXPR) GenProg::AssertCompile<(EXPR)>();
157
158 //=============================================================================
159 #endif // OPENMESH_GENPROG_HH defined
160 //=============================================================================
config.h
OpenMesh
Definition: MeshItems.hh:59