cpp/numeric/math/erfc

@1-3@ Computes the of, that is , but without loss of precision for large @A@ Additional overloads are provided for all integer types, which are treated as.

Return value
If no errors occur, value of the complementary error function of, that is or , is returned.

If a range error occurs due to underflow, the correct result (after rounding) 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 is returned
 * If the argument is -∞, 2 is returned
 * If the argument is NaN, NaN is returned