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std::numeric_limits::round_error

STD：：数字[医]限制：：圆[医]误差

static T round_error(​(until C++11)
static constexpr T round_error(​(since C++11)

返回以ULPS%28单位表示的最大可能的舍入误差，该值在ISO 10967定义的最后一个位置%29，它可以从0.5%28四舍五入到最近的数字%29到1.0%28舍入到零或无穷大%29。只有当std::numeric_limits<T>::is_integer==false...

返回值

Tstd::numeric_limits::round_error()
/* non-specialized */T(
boolfalse
char​0​
signed char​0​
unsigned char​0​
wchar_t​0​
char16_t​0​
char32_t​0​
short​0​
unsigned short​0​
int​0​
unsigned int​0​
long​0​
unsigned long​0​
long long​0​
unsigned long long​0​
float0.5F
double0.5
long double0.5L

例外

(none)(until C++11)
noexcept specification: noexcept(since C++11)

另见

round_style staticidentifies the rounding style used by the type (public static member constant)

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http：//en.cppreference.com/w/cpp/type/NUMERIC[医]极限/圆[医]误差

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