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std::copy, std::copy_if

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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 InputIt, class OutputIt >
OutputIt copy( InputIt first, InputIt last, OutputIt d_first );
(1)
template< class InputIt, class OutputIt, class UnaryPredicate >

OutputIt copy_if( InputIt first, InputIt last,
                  OutputIt d_first,

                  UnaryPredicate pred );
(2) (depuis C++11)
Copier les éléments de la gamme, défini par [first, last), dans un autre intervalle au début d_first. La deuxième fonction ne copie que les éléments pour lesquels le prédicat renvoie pred true .
Original:
Copies the elements in the range, defined by [first, last), to another range beginning at d_first. The second function only copies the elements for which the predicate pred returns true.
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Sommaire

[modifier] Paramètres

first, last -
l'éventail des éléments à copier
Original:
the range of elements to copy
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d_first -
le début de la plage de destination. Si d_first est dans [first, last), std::copy_backward doit être utilisé à la place de std::copy .
Original:
the beginning of the destination range. If d_first is within [first, last), std::copy_backward must be used instead of std::copy.
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pred - unary predicate which returns ​true
pour les éléments requis
Original:
for the required elements
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.

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

 bool pred(const Type &a);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The type Type must be such that an object of type InputIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.

[modifier] Retourne la valeur

Itérateur de sortie de l'élément dans la zone de destination, une après le dernier élément copié .
Original:
Output iterator to the element in the destination range, one past the last element copied.
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[modifier] Complexité

1)
Exactement last - first missions
Original:
Exactly last - first assignments
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2)
Exactement last - first applications du prédicat
Original:
Exactly last - first applications of the predicate
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[modifier] Notes

Dans la pratique, les implémentations de std::copy éviter les affectations multiples et l'utilisation en vrac fonctions de copie tels que std::memcpy si le type de valeur est TriviallyCopyable
Original:
In practice, implementations of std::copy avoid multiple assignments and use bulk copy functions such as std::memcpy if the value type is TriviallyCopyable
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[modifier] Mise en œuvre possible

First version
template<class InputIt, class OutputIt>
OutputIt copy(InputIt first, InputIt last, 
              OutputIt d_first)
{
    while (first != last) {
        *d_first++ = *first++;
    }
    return d_first;
}
Second version
template<class InputIt, class OutputIt, class UnaryPredicate>
OutputIt copy_if(InputIt first, InputIt last, 
                 OutputIt d_first, UnaryPredicate pred)
{
    while (first != last) {
        if(pred(*first))
            *d_first++ = *first;
         first++;
    }
    return d_first;
}

[modifier] Exemple

Le code suivant utilise la copie à la fois sur le contenu d'un vecteur à l'autre et d'afficher le vecteur résultant:
Original:
The following code uses copy to both copy the contents of one vector to another and to display the resulting vector:
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#include <algorithm>
#include <iostream>
#include <vector>
#include <iterator>
 
int main()
{
    std::vector<int> from_vector;
    for (int i = 0; i < 10; i++) {
        from_vector.push_back(i);
    }
 
    std::vector<int> to_vector(10);
 
    std::copy(from_vector.begin(), from_vector.end(), to_vector.begin());
 
    std::cout << "to_vector contains: ";
    std::copy(to_vector.begin(), to_vector.end(), 
              std::ostream_iterator<int>(std::cout, " "));
    std::cout << std::endl;
}

Résultat :

to_vector contains: 0 1 2 3 4 5 6 7 8 9

[modifier] Voir aussi

copie une plage d'éléments dans l'ordre inverse
Original:
copies a range of elements in backwards order
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(fonction générique) [edit]
Copie une série d'éléments en omettant ceux qui satisfont à certains critères
Original:
copies a range of elements omitting those that satisfy specific criteria
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(fonction générique) [edit]