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GenProg.hh
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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 //=============================================================================

acg pic Project OpenMesh, ©  Computer Graphics Group, RWTH Aachen. Documentation generated using doxygen .