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    std::prev

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    <metanoindex/>

     
    C++
     
    Iterator Bibliothek
    Iterator Primitiven
    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
    Iterator Adaptern
    Original:
    Iterator adaptors
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    reverse_iterator
    Stream-Iteratoren
    Original:
    Stream iterators
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    istream_iterator
    ostream_iterator
    istreambuf_iterator
    ostreambuf_iterator
    Iterator Operationen
    Original:
    Iterator operations
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    advance
    distance
    prev(C++11)
    next(C++11)
    Reichen Zugang
    Original:
    Range access
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    begin(C++11)
    end(C++11)
     
    <tbody> </tbody>
    definiert in Header <iterator>
    template< class BidirIt > BidirIt prev( BidirIt it, typename std::iterator_traits<BidirIt>::difference_type n = 1 );
    		 (seit C++11)
    Bringen Sie den nth Vorgänger Iterator it .
    Original:
    Return the nth predecessor of iterator it.
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    Parameter

    it -
    ein Iterator
    Original:
    an iterator
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    n -
    Anzahl der Elemente it sollte abstammen
    Original:
    number of elements it should be descended
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    Type requirements
    -
    BidirIt must meet the requirements of BidirectionalIterator.

    Rückgabewert

    Die nth Vorgänger Iterator it .
    Original:
    The nth predecessor of iterator it.
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    Mögliche Implementierung

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

    Beispiel

    #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';
}

    Output: 

    1

    Siehe auch

    (C++11)
    inkrementieren einen Iterator
    Original:
    increment an iterator
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    (Funktion) [edit]
    Fortschritte einen Iterator gegeben durch Distanz
    Original:
    advances an iterator by given distance
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    (Funktion) [edit]