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util: Add EXPLICIT_CONVERSION macro.

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This can be used to specify that a C++ conversion operator is not
meant to be used for implicit conversions, which can lead to
unintended loss of information in some cases.  Implemented as a macro
in order to keep old GCC versions happy.

Reviewed-by: Plamena Manolova <plamena.manolova@intel.com>
This commit is contained in:
Francisco Jerez 2018-02-12 16:32:20 -08:00
parent 378e918e28
commit 8d1f1ce412
1 changed files with 10 additions and 0 deletions
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10
src/util/macros.h
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@ -285,4 +285,14 @@ do { \
#define MIN3( A, B, C ) ((A) < (B) ? MIN2(A, C) : MIN2(B, C))
#define MAX3( A, B, C ) ((A) > (B) ? MAX2(A, C) : MAX2(B, C))
/**
* Macro for declaring an explicit conversion operator. Defaults to an
* implicit conversion if C++11 is not supported.
*/
#if __cplusplus >= 201103L
#define EXPLICIT_CONVERSION explicit
#elif defined(__cplusplus)
#define EXPLICIT_CONVERSION
#endif
#endif /* UTIL_MACROS_H */