std::float_t; std::double_t
Description
The types float_t and double_t are floating types at least as wide as float and double, respectively, and such that double_t is at least as wide as float_t.
The value of FLT_EVAL_METHOD
determines the types of float_t and double_t.
FLT_EVAL_METHOD
Explanation:
0
float_t and double_t are equivalent to float and double, respectively
1
both float_t and double_t are equivalent to double
2
both float_t and double_t are equivalent to long double
other both float_t and double_t are implementation defined
Declarations
typedef /*implementation defined*/ float_t
typedef /*implementation defined*/ double_t
Examples
#include <float.h>
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%d\n", FLT_EVAL_METHOD);
printf("%zu %zu\n", sizeof(float),sizeof(float_t));
printf("%zu %zu\n", sizeof(double),sizeof(double_t));
return 0;
}
0
4 4
8 8