abs.h

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#ifndef ABS_H
#define ABS_H
 
[[gnu::always_inline]]
static inline signed int abs_i(int x) {
    return (x < 0) ? -x : x;
}
 
[[gnu::always_inline]]
static inline float abs_f(float x) {
    return (x < 0.0f) ? -x : x;
}
 
#define ABS(x) _Generic((x) + 0, \
    int: abs_i, \
    float: abs_f \
)((x))
 
#endif // ABS_H