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std::prev

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< cpp‎ | iterator

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C++
 
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)
 
Déclaré dans l'en-tête <iterator>
template< class BidirIt >

BidirIt prev( BidirIt it,

              typename std::iterator_traits<BidirIt>::difference_type n = 1 );
 (depuis C++11)
Retour le prédécesseur de nth it itérateur .
Original:
Return the nth predecessor of iterator it.
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Sommaire

[modifier] Paramètres

it -
un itérateur
Original:
an iterator
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n -
nombre de it éléments devraient être descendu
Original:
number of elements it should be descended
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Type requirements
-
BidirIt must meet the requirements of BidirectionalIterator.

[modifier] Retourne la valeur

Le prédécesseur de nth it itérateur .
Original:
The nth predecessor of iterator it.
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[modifier] Mise en œuvre possible

template<class BidirIt>
BidirIt prev(BidirIt it, typename std::iterator_traits<BidirIt>::difference_type n = 1)
{
    std::advance(it, -n);
    return it;
}

[modifier] Exemple

#include <iostream>
#include <iterator>
#include <vector>
 
int main() 
{
    std::vector<int> v{ 3, 1, 4 };
 
    auto it = v.end();
 
    auto pv = std::prev(it, 2);
 
    std::cout << *pv << '\n';
}

Résultat : 

1

[modifier] Voir aussi

(C++11)
incrémenter un itérateur
Original:
increment an iterator
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(fonction) [edit]
avance un itérateur par distance donnée
Original:
advances an iterator by given distance
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(fonction) [edit]
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