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std::extent

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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
Informations sur le type d'exécution
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Runtime type information
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Caractères de type
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Type traits
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Catégories de type primaire
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is_void (C++11)
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Les relations et les requêtes de propriété
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Relationships and property queries
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is_same (C++11)
is_base_of (C++11)
is_convertible (C++11)
alignment_of (C++11)
rank (C++11)
extent (C++11)
Modifications de type
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Type modifications
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remove_cv
remove_const
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Tapez constantes traits
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Type trait constants
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integral_constant (C++11)
 
Defined in header <type_traits>
template< class T, unsigned N = 0>
struct extent;
(depuis C++11)
Si T est un type de tableau, fournit l'élément constant value égal au nombre d'éléments le long de la dimension de la matrice Nth, si N est en [0, std::rank<T>::value). Pour tout autre type, ou si T est un tableau de bornes inconnues le long de sa première dimension et N est 0, value est 0 .
Original:
If T is an array type, provides the member constant value equal to the number of elements along the Nth dimension of the array, if N is in [0, std::rank<T>::value). For any other type, or if T is array of unknown bound along its first dimension and N is 0, value is 0.
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Sommaire

Inherited from std::integral_constant

Member constants

value
[
statique
Original:
static
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]
the number of elements along the Nth dimension of T
(constante membre statique publique)

Member functions

operator std::size_t
convertit l'objet en std::size_t, retourne value
Original:
converts the object to std::size_t, returns value
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(fonction membre publique)

Member types

Type d'
Original:
Type
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Definition
value_type std::size_t
type std::integral_constant<std::size_t, value>

[modifier] Mise en œuvre possible

template<class T, unsigned N = 0>
struct extent : std::integral_constant<std::size_t, 0> {};
 
template<class T>
struct extent<T[], 0> : std::integral_constant<std::size_t, 0> {};
 
template<class T, unsigned N>
struct extent<T[], N> : std::integral_constant<std::size_t, std::extent<T, N-1>::value> {};
 
template<class T, std::size_t N>
struct extent<T[N], 0> : std::integral_constant<std::size_t, N> {};
 
template<class T, std::size_t I, unsigned N>
struct extent<T[I], N> : std::integral_constant<std::size_t, std::extent<T, N-1>::value> {};

[modifier] Exemple

#include <iostream>
#include <type_traits>
 
int main()
{
    std::cout << std::extent<int[3]>::value << '\n';
    std::cout << std::extent<int[3][4]>::value << '\n';
    std::cout << std::extent<int[3][4],1>::value << '\n';
    std::cout << std::extent<int[3][4],2>::value << '\n';
    std::cout << std::extent<int[]>::value << '\n';
}

Résultat :

3
3
4
0
0

[modifier] Voir aussi

(C++11)
vérifie si un type est un type tableau
Original:
checks if a type is an array type
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(classe générique) [edit]
(C++11)
obtient le nombre de dimensions d'un type de tableau
Original:
obtains the number of dimensions of an array type
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(classe générique) [edit]
supprime une mesure du type tableau donné
Original:
removes one extent from the given array type
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(classe générique) [edit]
supprime toutes les extensions du type tableau donné
Original:
removes all extents from the given array type
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(classe générique) [edit]