[c.math.abs] (original) (raw)

26 Numerics library [numerics]

26.8 Mathematical functions for floating-point types [c.math]

26.8.2 Absolute values [c.math.abs]

The headers <cstdlib> ([cstdlib.syn]) and<cmath> ([cmath.syn]) declare the functions described in this subclause.

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int abs(int j);long int abs(long int j);long long int abs(long long int j);float abs(float j);double abs(double j);long double abs(long double j);

Effects:The absfunctions have the semantics specified in the C standard library for the functions abs, labs, llabs,fabsf, fabs, and fabsl.

Remarks:If abs() is called with an argument of type Xfor which is_unsigned_v<X> is true and if X cannot be converted to intby integral promotion, the program is ill-formed.

[ Note

Arguments that can be promoted to int are permitted for compatibility with C.

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