std::float_round_style - cppreference.com

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enum float_round_style { round_indeterminate = -1, round_toward_zero = 0, round_to_nearest = 1, round_toward_infinity = 2, round_toward_neg_infinity = 3 };

Enumeration constants of type std::float_round_style indicate the rounding style used by floating-point arithmetic whenever a result of an expression is stored in an object of a floating-point type.

Enumeration constants

Enumerator Meaning
std::round_indeterminate rounding style cannot be determined
std::round_toward_zero rounding toward zero
std::round_to_nearest rounding toward nearest representable value
std::round_toward_infinity rounding toward positive infinity
std::round_toward_neg_infinity rounding toward negative infinity

See also