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mesa: Define introspection macro to determine whether a type is trivially destructible.

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Only implemented on GCC and Clang for now.  Other compilers use a
dummy implementation that always returns false, which should be a safe
[but slightly inefficient] assumption in all cases.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Francisco Jerez 2013-10-09 10:37:21 -07:00
parent be63803b0c
commit 98ab905af0
1 changed files with 23 additions and 1 deletions
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24
src/mesa/main/compiler.h
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@ -444,7 +444,29 @@ do { \
#define Elements(x) (sizeof(x)/sizeof(*(x))) #define Elements(x) (sizeof(x)/sizeof(*(x)))
#endif #endif
#ifdef __cplusplus
/**
* Macro function that evaluates to true if T is a trivially
* destructible type -- that is, if its (non-virtual) destructor
* performs no action and all member variables and base classes are
* trivially destructible themselves.
*/
# if defined(__GNUC__)
# if ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)))
# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
# endif
# elif (defined(__clang__) && defined(__has_feature))
# if __has_feature(has_trivial_destructor)
# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
# endif
# endif
# ifndef HAS_TRIVIAL_DESTRUCTOR
/* It's always safe (if inefficient) to assume that a
* destructor is non-trivial.
*/
# define HAS_TRIVIAL_DESTRUCTOR(T) (false)
# endif
#endif
#ifdef __cplusplus #ifdef __cplusplus
} }