cpp/numeric/math/ceil

@1-3@ Computes the smallest integer value not less than.

Return value
If no errors occur, the smallest integer value not less than, that is $⌈num⌉$, is returned.

Error handling
Errors are reported as specified in math_errhandling.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),
 * The current rounding mode has no effect.
 * If is ±∞, it is returned unmodified
 * If is ±0, it is returned, unmodified
 * If is NaN, NaN is returned