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std::vector::operator[] — cppreference.com

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reference operator[]( size_type pos );

const_reference operator[]( size_type pos ) const;

Renvoie une référence à l'élément à pos emplacement spécifié. Aucune vérification de limites est effectuée .

Original:

Returns a reference to the element at specified location pos. No bounds checking is performed.

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Paramètres

pos -

position de l'élément de retour

Original:

position of the element to return

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Retourne la valeur

une référence à l'élément souhaité

Original:

reference to the requested element

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Complexité

Constante

Original:

Constant

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Exemple

Le code suivant utilise operator[] lire et d'écrire dans un std::vector<int>:

Original:

The following code uses operator[] read from and write to a std::vector<int>:

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#include <vector>
#include <iostream>
 
int main()
{
    std::vector<int> numbers {2, 4, 6, 8};

    std::cout << "Second element: " << numbers[1] << '\n';

    numbers[0] = 5;

    std::cout << "All numbers:";
    for (auto i : numbers) {
        std::cout << ' ' << i;
    }
    std::cout << '\n';
}

Résultat : 

Second element: 4
All numbers: 5 4 6 8

Voir aussi

accède à l'élément spécifié avec vérification de bornes
(fonction membre publique) [edit]