Changeset 3232 for code/trunk/src/util
- Timestamp:
- Jun 26, 2009, 11:41:11 AM (15 years ago)
- Location:
- code/trunk/src/util
- Files:
-
- 1 added
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
code/trunk/src/util/Convert.h
r3196 r3232 44 44 #include "Debug.h" 45 45 #include "String.h" 46 47 // GCC generates warnings when implicitely casting from float to int for instance. 48 // This is however exactly what convertValue does, so we need to suppress these warnings. 49 // They only occur when using the ImplicitConversion template. 50 #ifdef ORXONOX_COMPILER_GCC 51 # pragma GCC system_header 52 #endif 53 54 55 /////////////////////////////////////////////// 56 // Static detection for conversion functions // 57 /////////////////////////////////////////////// 58 59 /* The idea to use the sizeof() operator on return functions to determine function existance 60 is described in 'Modern C++ design' by Alexandrescu (2001). */ 61 62 // disable warnings about possible loss of data 63 #ifdef ORXONOX_COMPILER_MSVC 64 # pragma warning(push) 65 # pragma warning(disable:4244) 66 #endif 67 68 namespace orxonox 69 { 70 template <class FromType, class ToType> 71 class ImplicitConversion 72 { 73 private: 74 ImplicitConversion(); ImplicitConversion(const ImplicitConversion&); ~ImplicitConversion(); 75 // Gets chosen only if there is an implicit conversion from FromType to ToType. 76 static char test(ToType); 77 // Accepts any argument. Why do we not use a template? The reason is that with templates, 78 // the function above is only taken iff it is an exact type match. But since we want to 79 // check for implicit conversion, we have to use the ellipsis. 80 static long long test(...); 81 static FromType object; // helper object to handle private c'tor and d'tor 82 public: 83 // test(object) only has 'long long' return type iff the compiler doesn't choose test(...) 84 enum { exists = (sizeof(test(object)) == sizeof(char)) }; 85 }; 86 } 87 88 #ifdef ORXONOX_COMPILER_MSVC 89 # pragma warning(pop) 90 #endif 91 46 #include "TemplateUtils.h" 92 47 93 48 ////////////////////////////////////
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