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      std::copy, std::copy_if

      De cppreference.com
      < cpp‎ | algorithm

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      C++
       
      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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      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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      Déclaré dans l'en-tête <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 predtrue .
      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 - prédicat unéaire qui retourne ​true
      pour les éléments requis
      Original:
      for the required elements
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      .

      L'expression pred(v) doit pouvoir être convertie à bool pour tout argument v de type (possiblement const) VT, où VT est le type de valeur de InputIt, inconditionellement de value category, et ne doit pas modifier v. Ainsi, un type-paramètre VT&n'est pas permis ainsi que pour VT sauf pour VT un déplacement est équivalent à une copie (depuis C++11). ​

      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 évitent les affectations multiples et utilisent des fonctions de copie binaire telles que std::memmove 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]
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/algorithm/copy&oldid=49956 »
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