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std::float_round_style

STD：浮动[医]圆[医]风格

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

类型枚举常数std::float_round_style当表达式的结果存储在浮点类型的对象中时，指示浮点算法使用的舍入样式。这些价值是：

枚举常数

NameDefinition
std::round_indeterminateRounding style cannot be determined
std::round_toward_zeroRounding toward zero
std::round_to_nearestRounding toward nearest representable value
std::round_toward_infinityRounding toward positive infinity
std::round_toward_neg_infinityRounding toward negative infinity

另见

round_style staticidentifies the rounding style used by the type (public static member constant)
FE_DOWNWARDFE_TONEARESTFE_TOWARDZEROFE_UPWARD (C++11)floating-point rounding direction (macro constant)

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http：//en.cppreference.com/w/cpp/type/NUMERIC[医]限制/浮动[医]圆[医]风格

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