std::numeric_limits::lowest — cppreference.com

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`static constexpr T lowest()`		(depuis C++11)

Renvoie la plus petite valeur finie représentable par la T type numérique, c'est-à une valeur finie x telle qu'il n'y a pas d'autre valeur finie y où y < x. Ceci est différent de std::numeric_limits<T>::min() de types à virgule flottante. N'a de sens que pour les types bornés .

Original:

Returns the lowest finite value representable by the numeric type T, that is, a finite value x such that there is no other finite value y where y < x. This is different from std::numeric_limits<T>::min() for floating-point types. Only meaningful for bounded types.

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Retourne la valeur


`T`	`std::numeric_limits<T>::lowest()`

/* non-specialized */	`T();`

`bool`	`false`

`char`	CHAR_MIN

`signed char`	SCHAR_MIN

`unsigned char`	`0`

`wchar_t`	WCHAR_MIN

`char16_t`	`0`

`char32_t`	`0`

`short`	SHRT_MIN

`unsigned short`	`0`

`int`	INT_MIN

`unsigned int`	`0`

`long`	LONG_MIN

`unsigned long`	`0`

`long long`	LLONG_MIN

`unsigned long long`	`0`

`float`	`-FLT_MAX`

`double`	`-DBL_MAX`

`long double`	`-LDBL_MAX`

Notes

Alors que ce n'est pas vrai pour C + + fondamentale flottante poing types, un tiers à virgule flottante de type T peut exister tel que std::numeric_limits<T>::lowest() != -std::numeric_limits<T>::max() .

Original:

While it's not true for fundamental C++ floating-poing types, a third-party floating-point type T may exist such that std::numeric_limits<T>::lowest() != -std::numeric_limits<T>::max().

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Exceptions

Exemple

Démontre min, max, et plus faible pour types à virgule flottante

Original:

Demonstrates min, max, and lowest for floating-point types

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#include <limits>
#include <iostream>
int main()
{
    
    std::cout << "std::numeric_limits<T>::min():\n"
              << "\tfloat: " << std::numeric_limits<float>::min()
              << " or " << std::hexfloat << std::numeric_limits<float>::min() << '\n'
              << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::min()
              << " or " << std::hexfloat << std::numeric_limits<double>::min() << '\n';
    std::cout << "std::numeric_limits<T>::lowest():\n"
              << "\tfloat: " << std::defaultfloat << std::numeric_limits<float>::lowest()
              << " or " << std::hexfloat << std::numeric_limits<float>::lowest() << '\n'
              << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::lowest()
              << " or " << std::hexfloat << std::numeric_limits<double>::lowest() << '\n';
    std::cout << "std::numeric_limits<T>::max():\n"
              << "\tfloat: " << std::defaultfloat << std::numeric_limits<float>::max()
              << " or " << std::hexfloat << std::numeric_limits<float>::max() << '\n'
              << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::max()
              << " or " << std::hexfloat << std::numeric_limits<double>::max() << '\n';
}

Résultat :

std::numeric_limits<T>::min():
        float: 1.17549e-38 or 0x1p-126
        double: 2.22507e-308 or 0x1p-1022
std::numeric_limits<T>::lowest():
        float: -3.40282e+38 or -0x1.fffffep+127
        double: -1.79769e+308 or -0x1.fffffffffffffp+1023
std::numeric_limits<T>::max():
        float: 3.40282e+38 or 0x1.fffffep+127
        double: 1.79769e+308 or 0x1.fffffffffffffp+1023

Voir aussi


min [ statique Original: static The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. ]	renvoie la plus petite valeur finie du type donné Original: returns the smallest finite value of the given type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique statique) [edit]

denorm_min [ statique Original: static The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. ]	retourne la plus petite valeur positive inférieure à la normale de la donnée à virgule flottante de type Original: returns the smallest positive subnormal value of the given floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique statique) [edit]

max [ statique Original: static The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. ]	renvoie la plus grande valeur finie du type donné Original: returns the largest finite value of the given type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique statique) [edit]