...
This compliant solution follows the guidance of PRE00-C. Prefer inline or static functions to function-like macros by defining an inline function iabs() to replace the ABS() macro. Unlike the ABS() macro, which operates on operands of any type, the abs() function will truncate arguments of types wider than int whose value is not in range of the latter type.
...
| Code Block | ||||
|---|---|---|---|---|
| ||||
#include <complex.h>
#include <math.h>
static inline long long llabs(long long v) {
return v < 0 ? -v : v;
}
static inline long labs(long v) {
return v < 0 ? -v : v;
}
static inline int iabs(int v) {
return v < 0 ? -v : v;
}
static inline int sabs(short v) {
return v < 0 ? -v : v;
}
static inline int scabs(signed char v) {
return v < 0 ? -v : v;
}
#define ABS(v) _Generic(v, signed char : scabs, \
short : sabs, \
int : iabs, \
long : labs, \
long long : llabs, \
float : fabsf, \
double : fabs, \
long double : fabsl, \
double complex : cabs, \
float complex : cabsf, \
long double complex : cabsl)(v)
void func(int n) {
/* Validate that n is within the desired range */
int m = ABS(++n);
/* ... */
} |
...