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std::move_iterator

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< cpp‎ | iterator

 
 
Bibliothèque Iterator
Primitives Iterator
Original:
Iterator primitives
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iterator_traits
input_iterator_tag
output_iterator_tag
forward_iterator_tag
bidirectional_iterator_tag
random_access_iterator_tag
iterator
Adaptateurs Iterator
Original:
Iterator adaptors
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reverse_iterator
Itérateurs de flux
Original:
Stream iterators
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istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Opérations Iterator
Original:
Iterator operations
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advance
distance
prev (C++11)
next (C++11)
Gamme d'accès
Original:
Range access
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begin (C++11)
end (C++11)
 
std::istream_iterator
Les fonctions membres
Original:
Member functions
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move_iterator::move_iterator
move_iterator::operator=
move_iterator::base
move_iterator::operator*
move_iterator::operator->
move_iterator::operator[]
move_iterator::operator++
move_iterator::operator+
move_iterator::operator+=
move_iterator::operator--
move_iterator::operator-
move_iterator::operator-=
Tiers fonctions
Original:
Non-member functions
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operator==
operator!=
operator<
operator>
operator+
operator-
 
Defined in header <iterator>
template <class Iterator>
class move_iterator
(depuis C++11)
std::move_iterator est un adaptateur itérateur qui se comporte exactement comme l'itérateur sous-jacente (qui doit être d'au moins un InputIterator), sauf que le déréférencement convertit la valeur retournée par l'itérateur sous-jacent dans une rvalue. Si cet itérateur est utilisé comme un itérateur d'entrée, l'effet est que les valeurs sont déplacés d', plutôt que de copier de .
Original:
std::move_iterator is an iterator adaptor which behaves exactly like the underlying iterator (which must be at least an InputIterator), except that dereferencing converts the value returned by the underlying iterator into an rvalue. If this iterator is used as an input iterator, the effect is that the values are moved from, rather than copied from.
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Sommaire

[modifier] Types de membres

Type du membre Définition
iterator_type Iterator
difference_type std::iterator_traits<Iterator>::difference_type
pointer Iterator
value_type std::iterator_traits<Iterator>::value_type
iterator_category std::iterator_traits<Iterator>::iterator_category
reference value_type&&

[modifier] Fonctions membres

construit un nouvel itérateur adaptateur
Original:
constructs a new iterator adaptor
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(fonction membre publique) [edit]
assigne un autre itérateur
Original:
assigns another iterator
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(fonction membre publique) [edit]
accède à l'itérateur sous-jacent
Original:
accesses the underlying iterator
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(fonction membre publique) [edit]
accède à l'élément pointé vers
Original:
accesses the pointed-to element
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(fonction membre publique) [edit]
obtient de référence rvalue à l'élément indexé
Original:
obtains rvalue reference to indexed element
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(fonction membre publique) [edit]
avances ou décrémente l'itérateur
Original:
advances or decrements the iterator
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(fonction membre publique) [edit]

[modifier] Fonctions annexes

compare les itérateurs sous-jacents
Original:
compares the underlying iterators
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(fonction générique) [edit]
progrès de l'itérateur
Original:
advances the iterator
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(fonction générique) [edit]
calcule la distance entre deux adaptateurs itérateur
Original:
computes the distance between two iterator adaptors
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(fonction générique) [edit]

[modifier] Exemple

#include <iostream>
#include <algorithm>
#include <vector>
#include <iterator>
#include <numeric>
int main()
{
    std::vector<std::string> v{"this", "is", "an", "example"};
 
    std::cout << "Old contents of the vector: ";
    for(auto& s : v)
        std::cout << '"' << s << "\" ";
 
    typedef std::vector<std::string>::iterator iter_t;
    std::string concat = std::accumulate(
                             std::move_iterator<iter_t>(v.begin()),
                             std::move_iterator<iter_t>(v.end()),
                             std::string());  // Can be simplified with std::make_move_iterator
 
    std::cout << "\nConcatenated as string: " << concat << '\n'
              << "New contents of the vector: ";
    for(auto& s : v)
        std::cout << '"' << s << "\" ";
    std::cout << '\n';
}

Résultat :

Old contents of the vector: "this" "is" "an" "example"
Concatenated as string: thisisanexample
New contents of the vector: "" "" "" ""

[modifier] Voir aussi

crée un std::move_iterator de type inféré à partir de l'argument
Original:
creates a std::move_iterator of type inferred from the argument
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(fonction générique) [edit]