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std::generate_n

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Bibliothèque d'algorithmes
Fonctions
Original:
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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Définir les opérations (sur les gammes triés)
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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 Generator >

void generate_n( OutputIt first, Size count, Generator g );
template< class OutputIt, class Size, class Generator >

OutputIt generate_n( OutputIt first, Size count, Generator g );
(avant C++11)

(depuis C++11)
Ayants droit, les valeurs générées par la fonction g objet donné, aux éléments count premiers pas dans la gamme débutant à first, si count>0. Ne fait rien autrement .
Original:
Assigns values, generated by given function object g, 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 générer
Original:
the beginning of the range of elements to generate
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count -
nombre d'éléments à générer
Original:
number of the elements to generate
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g - generator function object that will be called.

The signature of the function should be equivalent to the following:

Ret fun();

The type  Ret must be such that an object of type OutputIt can be dereferenced and assigned a value of type  Ret. ​

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 count invocations de g() et des affectations, pour count>0 .
Original:
Exactly count invocations of g() and assignments, for count>0.
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[modifier] Mise en œuvre possible

template< class OutputIt, class Size, class Generator >
OutputIt generate_n( OutputIt first, Size count, Generator g )
{
    for( Size i = 0; i < count; i++ ) {
        *first++ = g();
    }
    return first;
}

[modifier] Exemple

Le code suivant remplit un tableau d'entiers avec des nombres aléatoires .
Original:
The following code fills an array of integers with random numbers.
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#include <cstddef>
#include <cstdlib>
#include <iostream>
#include <iterator>
#include <algorithm>
 
int main()
{
    const std::size_t N = 5;
    int ar[N];
    std::generate_n(ar, N, std::rand); // Using the C function rand()
 
    std::cout << "ar: ";
    std::copy(ar, ar+N, std::ostream_iterator<int>(std::cout, " "));
    std::cout << "\n";
}

Résultat :

52894 15984720 41513563 41346135 51451456

[modifier] Voir aussi

assigne une valeur à un nombre d'éléments
Original:
assigns a value to a number of elements
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(fonction générique) [edit]
enregistre le résultat d'une fonction dans une plage
Original:
saves the result of a function in a range
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(fonction générique) [edit]