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std::numeric_limits::min

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Fixe les types entiers largeur (C++11)
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Numeric limits
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numeric_limits
C numérique limite interface
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std::numeric_limits
 
static T min()
(avant C++11)
static constexpr T min()
(depuis C++11)
Retourne la valeur minimale représentable fini par le T type numérique. Pour flotter types de points de dénormalisation renvoie la valeur minimale positif normalisé. N'a de sens que pour les types bornées et non bornées pour les types non signés, c'est-à-types qui représentent un ensemble infini de valeurs négatives n'ont aucun minimum significatif .
Original:
Returns the minimum finite value representable by the numeric type T. For floating point types with denormalization returns the minimum positive normalized value. Only meaningful for bounded types and for unbounded unsigned types, that is, types that represent an infinite set of negative values have no meaningful minimum.
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Sommaire

[modifier] Retourne la valeur

T std::numeric_limits<T>::min()
/* 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_MIN
double DBL_MIN
long double LDBL_MIN

[modifier] Exceptions

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Exemple

Illustre l'utilisation de types typedef, et la différence dans le signe du résultat entre les types entiers et en virgule flottante
Original:
Demonstrates the use with typedef types, and the difference in the sign of the result between integer and floating-point types
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#include <limits>
#include <cstddef>
#include <iostream>
int main()
{
    std::cout << "short: " << std::dec << std::numeric_limits<short>::min()
              << " or " << std::hex << std::showbase << std::numeric_limits<short>::min() << '\n'
              << "int: " << std::dec << std::numeric_limits<int>::min() << std::showbase
              << " or " << std::hex << std::numeric_limits<int>::min() << '\n' << std::dec 
              << "ptrdiff_t: " << std::numeric_limits<std::ptrdiff_t>::min() << std::showbase
              << " or " << std::hex << std::numeric_limits<std::ptrdiff_t>::min() << '\n'
              << "float: " << std::numeric_limits<float>::min()
              << " or " << std::hexfloat << std::numeric_limits<float>::min() << '\n'
              << "double: " << std::defaultfloat << std::numeric_limits<double>::min()
              << " or " << std::hexfloat << std::numeric_limits<double>::min() << '\n';
}

Résultat :

short: -32768 or 0x8000
int: -2147483648 or 0x80000000
ptrdiff_t: -9223372036854775808 or 0x8000000000000000
float: 1.17549e-38 or 0x1p-126
double: 2.22507e-308 or 0x1p-1022

[modifier] Voir aussi

[
statique
Original:
static
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]
(C++11)
renvoie la plus petite valeur finie du type donné
Original:
returns the lowest finite value of the given type
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(fonction membre publique statique) [edit]
[
statique
Original:
static
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]
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
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(fonction membre publique statique) [edit]
[
statique
Original:
static
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]
renvoie la plus grande valeur finie du type donné
Original:
returns the largest finite value of the given type
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(fonction membre publique statique) [edit]