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std::copy_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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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 InputIt, class Size, class OutputIt >
OutputIt copy_n( InputIt first, Size count, OutputIt result );
Copie exactement count valeurs du début de la plage à first au début de la plage à result, si count>0. Ne fait rien autrement .
Original:
Copies exactly count values from the range beginning at first to the range beginning at result, if count>0. Does nothing otherwise.
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Sommaire

[modifier] Paramètres

first -
le début de la série d'éléments à copier
Original:
the beginning of the range of elements to copy from
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count -
nombre d'éléments à copier
Original:
number of the elements to copy
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result -
le début de la plage de destination
Original:
the beginning of the destination range
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Type requirements
-
InputIt must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.

[modifier] Retourne la valeur

Iterator dans la plage de destination, pointant après le dernier élément copié ou si count>0 first autrement .
Original:
Iterator in the destination range, pointing past the last element copied if count>0 or first otherwise.
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[modifier] Complexité

Exactement count missions, si count>0 .
Original:
Exactly count assignments, if count>0.
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[modifier] Mise en œuvre possible

template< class InputIt, class Size, class OutputIt>
OutputIt copy_n(InputIt first, Size count, OutputIt result)
{
    if (count > 0) {
        *result++ = *first;
        for (Size i = 1; i < count; ++i) {
            *result++ = *++first;
        }
    }
    return result;
}

[modifier] Exemple

#include <iostream>
#include <string>
#include <algorithm>
#include <iterator>
 
int main()
{
    std::string in = "1234567890";
    std::string out;
 
    std::copy_n(in.begin(), 4, std::back_inserter(out));
    std::cout << out << '\n';
}

Résultat :

1234

[modifier] Voir aussi


(C++11)
Copie une série d'éléments vers un nouvel emplacement
Original:
copies a range of elements to a new location
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(fonction générique) [edit]