std::copy, std::copy_if
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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, | (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. The text has been machine-translated via Google Translate.
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| Sommaire | 
[modifier] Paramètres
| first, last | - |  l'éventail des éléments à copier Original:  the range of elements to copy The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | 
| d_first | - |  le début de la plage de destination. Si  d_firstest dans[first, last), std::copy_backward doit être utilisé à la place de std::copy .Original:  the beginning of the destination range. If  d_firstis within[first, last), std::copy_backward must be used instead of std::copy.The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | 
| pred | - | unary predicate which returns true  pour les éléments requis . Original:  for the required elements  The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. 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. | 
| Type requirements | ||
| - InputItmust meet the requirements ofInputIterator. | ||
| - OutputItmust meet the requirements ofOutputIterator. | ||
[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 
2) last - first missionsOriginal:
Exactly 
last - first assignmentsThe text has been machine-translated via Google Translate.
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Exactement 
last - first applications du prédicatOriginal:
Exactly 
last - first applications of the predicateThe text has been machine-translated via Google Translate.
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[modifier] Notes
Dans la pratique, les implémentations de 
std::copy évitent les affectations multiples et utilisent des fonctions de copie binaire telles que std::memmove si le type de valeur est TriviallyCopyableOriginal:
In practice, implementations of 
std::copy avoid multiple assignments and use bulk copy functions such as std::memcpy if the value type is TriviallyCopyableThe text has been machine-translated via Google Translate.
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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  The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) | |
|  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  The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) | |


