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[round.style]
17 Language support library [support]
17.3 Implementation properties [support.limits]
17.3.4 Enum float_round_style [round.style]
namespace std {enum float_round_style { round_indeterminate = -1, round_toward_zero = 0, round_to_nearest = 1, round_toward_infinity = 2, round_toward_neg_infinity = 3};}
The rounding mode for floating-point arithmetic is characterized by the values:
round_indeterminate if the rounding style is indeterminable
round_toward_zero if the rounding style is toward zero
round_to_nearest if the rounding style is to the nearest representable value
round_toward_infinity if the rounding style is toward infinity
round_toward_neg_infinity if the rounding style is toward negative infinity