SafeBool.hpp

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00032 
00033 #ifndef MaximInterfaceCore_SafeBool_hpp
00034 #define MaximInterfaceCore_SafeBool_hpp
00035 
00036 #include <stddef.h>
00037 #include "Unconstructible.hpp"
00038 
00039 namespace MaximInterfaceCore {
00040 namespace detail {
00041 
00042 // Implement SafeBool as a member function pointer since some compilers allow
00043 // function pointer to void pointer conversion.
00044 struct SafeBoolHelper : Unconstructible {
00045   void trueValue() const {}
00046 };
00047 
00048 } // namespace detail
00049 
00050 /// @brief Type definition for SafeBool.
00051 /// @details
00052 /// SafeBool is a boolean type that eliminates many error-prone implicit
00053 /// conversions allowed by the fundamental bool type.
00054 /// @note
00055 /// SafeBool can be used to add an explicit bool conversion operator to a type.
00056 typedef void (detail::SafeBoolHelper::*SafeBool)() const;
00057 
00058 /// Constructor for SafeBool.
00059 inline SafeBool makeSafeBool(bool value) {
00060   return value ? &detail::SafeBoolHelper::trueValue : NULL;
00061 }
00062 
00063 } // namespace MaximInterfaceCore
00064 
00065 #endif