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std::numeric_limits::round_style

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C++
 
Bibliothèque d'utilitaires
 
Soutien aux types fondamentaux
Les types de base
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Basic types
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Types fondamentaux
Fixe les types entiers largeur (C++11)
Limites numériques
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Numeric limits
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numeric_limits
C numérique limite interface
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std::numeric_limits
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float_round_style
float_denorm_style
 
static const std::float_round_style round_style
 (avant C++11)
static constexpr std::float_round_style round_style
 (depuis C++11)
La valeur de std::numeric_limits<T>::round_stylem identifie le style arrondi utilisé par le T type virgule flottante à chaque fois une valeur qui n'est pas l'une des valeurs exactement repesentable de T est stocké dans un objet de ce type .
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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[modifier] Spécialisations standard

T
valeur de std::numeric_limits<T>::round_style
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
généralement std::round_to_nearest
Original:
usually std::round_to_nearest
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double
généralement std::round_to_nearest
Original:
usually std::round_to_nearest
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long double
généralement std::round_to_nearest
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usually std::round_to_nearest
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[modifier] Exemple

Le 0.1 valeur décimale ne peut pas être représenté par une binaire à virgule flottante de type. Lorsqu'elles sont stockées dans une carte IEEE-745 double, il se situe entre 0x1.9999999999999*2-4
 et 0x1.999999999999a*2-4
. Arrondi au plus près les résultats de valeurs représentables dans 0x1.999999999999a*2-4
 .
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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De même, la valeur décimale 0,3, qui est comprise entre 0x1.3333333333333*2-2
 et 0x1.3333333333334*2-2
 est arrondi à la plus proche et est stocké sous forme 0x1.3333333333333*2-2
 .
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';
}

Résultat : 

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

[modifier] Voir aussi
indique modes d'arrondi en virgule flottante
Original:
indicates floating-point rounding modes
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(enum) [edit]
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