std::rank — cppreference.com

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Déclaré dans l'en-tête `<type_traits>`
`template< class T > struct rank;`		(depuis C++11)

If T is an array type, provides the member constant value equal to the number of dimensions of the array. For any other type, value is 0.

Inherited from std::integral_constant

Member constants


value [ 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. ]	the number of dimensions of `T` or zero (constante membre statique publique)

Member functions


	convertit l'objet en `std::size_t`, retourne `value` Original: converts the object to `std::size_t`, returns `value` 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)

Member types


Type d' Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`value_type`	`std::size_t`

`type`	`std::integral_constant<std::size_t, value>`

Mise en œuvre possible

template<class T>
struct rank : std::integral_constant<std::size_t, 0> {};

template<class T>
struct rank<T[]> : public std::integral_constant<std::size_t, rank<T>::value + 1> {};

template<class T, size_t N>
struct rank<T[N]> : public std::integral_constant<std::size_t, rank<T>::value + 1> {};

Exemple

#include <iostream>
#include <type_traits>

int main()
{
    std::cout << std::rank<int[1][2][3]>::value << '\n';
    std::cout << std::rank<int[][2][3][4]>::value << '\n';
    std::cout << std::rank<int>::value << '\n';
}

Résultat :

Voir aussi


is_array (C++11)	vérifie si un type est un type tableau Original: checks if a type is an array type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe générique) [edit]

extent (C++11)	obtient la taille d'un type de réseau le long d'une dimension spécifiée Original: obtains the size of an array type along a specified dimension The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe générique) [edit]

remove_extent (C++11)	supprime une mesure du type tableau donné Original: removes one extent from the given array type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe générique) [edit]

remove_all_extents (C++11)	supprime toutes les extensions du type tableau donné Original: removes all extents from the given array type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe générique) [edit]