cpp/numeric/math/erf

@1-3@ Computes the of. @A@ Additional overloads are provided for all integer types, which are treated as.

Return value
If no errors occur, value of the error function of, that is , is returned. If a range error occurs due to underflow, the correct result (after rounding), that is is returned.

Error handling
Errors are reported as specified in math_errhandling.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),
 * If the argument is ±0, ±0 is returned
 * If the argument is ±∞, ±1 is returned
 * If the argument is NaN, NaN is returned