blocxx
SafeBool.hpp
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32
33
34#ifndef BLOCXX_SAFE_BOOL_HPP_INCLUDE_GUARD_
35#define BLOCXX_SAFE_BOOL_HPP_INCLUDE_GUARD_
36
42#include "blocxx/BLOCXX_config.h"
43
44namespace BLOCXX_NAMESPACE
45{
46
47#ifdef __xlC__
48#define BLOCXX_SAFE_BOOL_IMPL(classname, type, variable, test) \
49 operator bool () const \
50 { \
51 return (test);\
52 } \
53 bool operator !() const \
54 { \
55 return !(test); \
56 }
57#else // functional compilers
58#define BLOCXX_SAFE_BOOL_IMPL(classname, type, variable, test) \
59 typedef type classname::*safe_bool; \
60 operator safe_bool () const \
61 { \
62 return (test) ? &variable : 0; \
63 } \
64 bool operator !() const \
65 { \
66 return !(test); \
67 }
68#endif
69
70} // end namespace BLOCXX_NAMESPACE
71
72
73#endif
Taken from RFC 1321.