std::begin — cppreference.com

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Déclaré dans l'en-tête `<iterator>`
`template< class C > auto begin( C& c ) -> decltype(c.begin());`	(1)	(depuis C++11)
`template< class C > auto begin( const C& c ) -> decltype(c.begin());`	(2)	(depuis C++11)
`template< class T, size_t N > T* begin( T (&array)[N] );`	(3)	(depuis C++11)

Retourne un itérateur au début de l'c conteneur donné ou un tableau array .

Original:

Returns an iterator to the beginning of the given container c or array array.

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Paramètres

c	-	un récipient avec un procédé `begin` Original: a container with a `begin` method The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
array	-	un tableau de type arbitraire Original: an array of arbitrary type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Retourne la valeur

un itérateur au début de c ou array

Original:

an iterator to the beginning of c or array

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Notes

En plus d'être inclus dans <iterator>, std::begin est assuré de devenir disponibles si l'un des en-têtes suivants sont inclus: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set> et <vector> .

Original:

In addition to being included in <iterator>, std::begin is guaranteed to become available if any of the following headers are included: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set>, and <vector>.

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Spécialisations

Spécialisations personnalisés de std::begin peut être fourni pour les classes qui n'exposent pas une fonction membre begin() approprié, mais peut être itérée. Les spécialisations suivantes sont déjà fournis par la bibliothèque standard:

Original:

Custom specializations of std::begin may be provided for classes that do not expose a suitable begin() member function, yet can be iterated. The following specializations are already provided by the standard library:

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Exemple

#include <iostream>
#include <vector>
#include <iterator>

int main() 
{
    std::vector<int> v = { 3, 1, 4 };
    auto vi = std::begin(v);
    std::cout << *vi << '\n'; 

    int a[] = { -5, 10, 15 };
    auto ai = std::begin(a);
    std::cout << *ai << '\n';
}

Résultat :

Voir aussi


	retourne un itérateur à l'extrémité d'un conteneur ou d'un tableau Original: returns an iterator to the end of a container or array The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]