clamp.h

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#ifndef CLAMP_H
#define CLAMP_H
 
#define DEFINE_CLAMP(type, name)                                      \
[[gnu::always_inline]]                                                \
static inline type clamp_##name(type input, type lower, type upper) {  \
    if (input < lower) return lower;                                  \
    if (input > upper) return upper;                                  \
    return input;                                                     \
}
 
DEFINE_CLAMP(int, int)
DEFINE_CLAMP(unsigned int, uint)
DEFINE_CLAMP(long, long)
DEFINE_CLAMP(unsigned long, ulong)
DEFINE_CLAMP(float, float)
 
#define CLAMP(input, lower_bound, upper_bound) \
    _Generic((input) + (lower_bound) + (upper_bound), \
    int: clamp_int, \
    unsigned int: clamp_uint, \
    long: clamp_long, \
    unsigned long: clamp_ulong, \
    float: clamp_float \
)(input, lower_bound, upper_bound)
 
 
#endif // CLAMP_H