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std::fill_n

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< cpp‎ | algorithm

 
 
Bibliothèque d'algorithmes
Fonctions
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Functions
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Non-modification de la séquence des opérations
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Non-modifying sequence operations
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Modification de la séquence des opérations
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Modifying sequence operations
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Des opérations de partitionnement
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Partitioning operations
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Opérations de tri (sur les gammes triés)
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Sorting operations (on sorted ranges)
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is_sorted (C++11)
is_sorted_until (C++11)
sort
Opérations binaires de recherche (sur les gammes triés)
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Binary search operations (on sorted ranges)
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Set operations (on sorted ranges)
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Opérations Heap
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Heap operations
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Minimum / maximum de fonctionnement
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Minimum/maximum operations
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Opérations numériques
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Numeric operations
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Bibliothèque C
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C library
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Defined in header <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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Sommaire

[modifier] Paramètres

first -
le début de la série d'éléments à modifier
Original:
the beginning of the range of elements to modify
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count -
nombre d'éléments à modifier
Original:
number of elements to modify
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value -
la valeur à affecter
Original:
the value to be assigned
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Type requirements
-
OutputIt must meet the requirements of OutputIterator.

[modifier] 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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[modifier] Complexité

Exactement missions count, pour count>0 .
Original:
Exactly count assignments, for count>0.
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[modifier] 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;
}

[modifier] 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 :

-1 -1 -1 -1 -1 5 6 7 8 9

[modifier] Voir aussi

attribue un ensemble d'éléments d'une certaine valeur
Original:
assigns a range of elements a certain value
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(fonction générique) [edit]