cmath.h

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// Provide an uniform interface for basic math functions between AVR libc and newer
// standards that support <cmath>
#pragma once
 
#ifndef __AVR__
#include <cmath> // abs
 
#include <algorithm>
using std::max;
using std::min;
#else
 
// AVR libc doesn't support cmath
#include <math.h>
 
template <typename T>
static inline const T min(const T a, const T b) {
    return a <= b ? a : b;
}
 
template <typename T>
static inline const T max(const T a, const T b) {
    return a > b ? a : b;
}
 
template <typename T>
static inline const T abs(const T n) {
    return n < 0 ? -n : n;
}
 
static inline const int16_t abs(const int16_t n) {
    // Use builtin function only when possible
    return __builtin_abs((n));
}
 
#endif