blocxx

SafeBool.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2005, Quest Software, Inc. All rights reserved.
00003 * Copyright (C) 2006, Novell, Inc. All rights reserved.
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00005 * Redistribution and use in source and binary forms, with or without
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00032 
00033 
00034 #ifndef BLOCXX_SAFE_BOOL_HPP_INCLUDE_GUARD_
00035 #define BLOCXX_SAFE_BOOL_HPP_INCLUDE_GUARD_
00036 
00042 #include "blocxx/BLOCXX_config.h"
00043 
00044 namespace BLOCXX_NAMESPACE
00045 {
00046 
00047 #ifdef __xlC__
00048 #define BLOCXX_SAFE_BOOL_IMPL(classname, type, variable, test) \
00049    operator bool () const \
00050    { \
00051       return (test);\
00052    } \
00053    bool operator !() const \
00054    { \
00055       return !(test); \
00056    }
00057 #else // functional compilers
00058 #define BLOCXX_SAFE_BOOL_IMPL(classname, type, variable, test) \
00059    typedef type classname::*safe_bool; \
00060    operator safe_bool () const \
00061    { \
00062       return (test) ? &variable : 0; \
00063    } \
00064    bool operator !() const \
00065    { \
00066       return !(test); \
00067    }
00068 #endif
00069 
00070 } // end namespace BLOCXX_NAMESPACE
00071 
00072 
00073 #endif