cpp/numeric/fenv/feround

Manages the floating-point rounding direction.

@1@ Attempts to establish the floating-point rounding direction equal to the argument, which is expected to be one of the floating point rounding macros.

@2@ Returns the value of the floating point rounding macro that corresponds to the current rounding direction.

Return value
1) on success, non-zero otherwise.

2) The floating point rounding macro describing the current rounding direction or a negative value if the direction cannot be determined.