std::fill_n — cppreference.com

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Déclaré dans l'en-tête `<algorithm>`
`template< class OutputIt, class Size, class T > void fill_n( OutputIt first, Size count, const T& value ); template< class OutputIt, class Size, class T > OutputIt fill_n( OutputIt first, Size count, const T& value );`		(avant C++11) (depuis C++11)

Affecte la valeur donnée à value les éléments count premiers pas dans la gamme débutant à first si count>0. Ne fait rien autrement .

Original:

Assigns the given value value to the first count elements in the range beginning at first if count>0. Does nothing otherwise.

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Paramètres

first	-	le début de la série d'éléments à modifier Original: the beginning of the range of elements to modify The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	nombre d'éléments à modifier Original: number of elements to modify The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
value	-	la valeur à affecter Original: the value to be assigned The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Type requirements
-`OutputIt` must meet the requirements of `OutputIterator`.

Retourne la valeur

(Aucun) (avant C++11)

Original:

(none) (avant C++11)

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Iterator une après le dernier élément affecté si count>0, first autrement. (depuis C++11)

Original:

Iterator one past the last element assigned if count>0, first otherwise. (depuis C++11)

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Complexité

Exactement missions count, pour count>0 .

Original:

Exactly count assignments, for count>0.

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Mise en œuvre possible

template<class OutputIt, class Size, class T>
OutputIt fill_n(OutputIt first, Size count, const T& value)
{
    for (Size i = 0; i < count; i++) {
        *first++ = value;
    }
    return first;
}

Exemple

Le code suivant utilise fill_n() d'affecter -1 au premier semestre un vecteur d'entiers:

Original:

The following code uses fill_n() to assign -1 to the first half of a vector of integers:

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#include <algorithm>
#include <vector>
#include <iostream>
 
int main()
{
    std::vector<int> v1{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
 
    std::fill_n(v1.begin(), 5, -1);
 
    for (vector<int>::iterator it = v1.begin(); it != v1.end(); ++it) {
        std::cout << *it << " ";
    }
    std::cout << "\n";
}

Résultat :

Voir aussi


	attribue un ensemble d'éléments d'une certaine valeur Original: assigns a range of elements a certain value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) [edit]