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remove compound literals from math.h to please c++ 

__FLOAT_BITS and __DOUBLE_BITS macros used union compound literals,
now they are changed into static inline functions. A good C compiler
generates the same code for both and the later is C++ conformant.
This commit is contained in:
Szabolcs Nagy 2013-05-06 17:52:48 +00:00
parent da49b872f5
commit 2897bfdd60
1 changed files with 10 additions and 5 deletions
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15
include/math.h
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@ -43,11 +43,16 @@ int __fpclassify(double);
int __fpclassifyf(float);
int __fpclassifyl(long double);
union __float_repr { float __f; __uint32_t __i; };
union __double_repr { double __f; __uint64_t __i; };
#define __FLOAT_BITS(f) (((union __float_repr){ (float)(f) }).__i)
#define __DOUBLE_BITS(f) (((union __double_repr){ (double)(f) }).__i)
static __inline __uint32_t __FLOAT_BITS(float __f)
{
union {float __f; __uint32_t __i;} __u = {__f};
return __u.__i;
}
static __inline __uint64_t __DOUBLE_BITS(double __f)
{
union {double __f; __uint64_t __i;} __u = {__f};
return __u.__i;
}
#define fpclassify(x) ( \
sizeof(x) == sizeof(float) ? __fpclassifyf(x) : \