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std::numeric_limits::round_style

提供: cppreference.com

 
 
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static const std::float_round_style round_style
(C + + 11時まで)
static constexpr std::float_round_style round_style
(C + + 11以来)
std::numeric_limits<T>::round_stylemの正確repesentableのいずれかの値ではない値がその型のオブジェクトに格納されるたびTの値は浮動小数点型のTによって使用される丸めスタイルを識別.
Original:
The value of std::numeric_limits<T>::round_stylem identifies the rounding style used by the floating-point type T whenever a value that is not one of the exactly repesentable values of T is stored in an object of that type.
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[編集] 標準の専門分野

T
std::numeric_limits<T>::round_styleの値
Original:
value of std::numeric_limits<T>::round_style
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/* non-specialized */ std::round_toward_zero
bool std::round_toward_zero
char std::round_toward_zero
signed char std::round_toward_zero
unsigned char std::round_toward_zero
wchar_t std::round_toward_zero
char16_t std::round_toward_zero
char32_t std::round_toward_zero
short std::round_toward_zero
unsigned short std::round_toward_zero
int std::round_toward_zero
unsigned int std::round_toward_zero
long std::round_toward_zero
unsigned long std::round_toward_zero
long long std::round_toward_zero
unsigned long long std::round_toward_zero
float
通常std::round_to_nearest
Original:
usually std::round_to_nearest
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double
通常std::round_to_nearest
Original:
usually std::round_to_nearest
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long double
通常std::round_to_nearest
Original:
usually std::round_to_nearest
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[編集]

10進値0.1は、バイナリ浮動小数点型で表現できない。 IEEE-745doubleに格納されているとき、それは0x1.9999999999999*2-4
0x1.999999999999a*2-4
の間に入る。 0x1.999999999999a*2-4
で表現可能な最も近い値への丸めの結果.
Original:
The decimal value 0.1 cannot be represented by a binary floating-point type. When stored in an IEEE-745 double, it falls between 0x1.9999999999999*2-4
and 0x1.999999999999a*2-4
. Rounding to nearest representable value results in 0x1.999999999999a*2-4
.
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0x1.3333333333333*2-2
間と0x1.3333333333334*2-2
最寄りに丸められており、0x1.3333333333333*2-2
として格納されている同様に、10進値0.3、.
Original:
Similarly, the decimal value 0.3, which is between 0x1.3333333333333*2-2
and 0x1.3333333333334*2-2
is rounded to nearest and is stored as 0x1.3333333333333*2-2
.
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#include <iostream>
#include <limits>
int main()
{
    std::cout << std::hexfloat << "The decimal 0.1 is stored in a double as "
              << 0.1 << '\n'
              << "The decimal 0.3 is stored in a double as "
              << 0.3 << '\n'
              << "The rounding style is " << std::numeric_limits<double>::round_style << '\n';
}

Output:

The decimal 0.1 is stored in a double as 0x1.999999999999ap-4
The decimal 0.3 is stored in a double as 0x1.3333333333333p-2
The rounding style is 1

[編集] も参照してください

浮動小数点丸めモードを示しています
Original:
indicates floating-point rounding modes
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(列挙) [edit]