Namensräume
Varianten
Aktionen

std::prev

Aus cppreference.com
< cpp‎ | iterator

This page has been machine-translated from the English version of the wiki using Google Translate.

The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

Click here for the English version of this page

 
C++
 
Iterator Bibliothek
Iterator Primitiven
Original:
Iterator primitives
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
iterator_traits
input_iterator_tag
output_iterator_tag
forward_iterator_tag
bidirectional_iterator_tag
random_access_iterator_tag
iterator
Iterator Adaptern
Original:
Iterator adaptors
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
reverse_iterator
Stream-Iteratoren
Original:
Stream iterators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Iterator Operationen
Original:
Iterator operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
advance
distance
prev(C++11)
next(C++11)
Reichen Zugang
Original:
Range access
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
begin(C++11)
end(C++11)
 
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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Inhaltsverzeichnis

[Bearbeiten] Parameter

it -
ein Iterator
Original:
an iterator
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
n -
Anzahl der Elemente it sollte abstammen
Original:
number of elements it should be descended
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Type requirements
-
BidirIt must meet the requirements of BidirectionalIterator.

[Bearbeiten] Rückgabewert

Die nth Vorgänger Iterator it .
Original:
The nth predecessor of iterator it.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[Bearbeiten] Mögliche Implementierung

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

[Bearbeiten] 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

[Bearbeiten] Siehe auch

(C++11)
inkrementieren einen Iterator
Original:
increment an iterator
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(Funktion) [edit]
Fortschritte einen Iterator gegeben durch Distanz
Original:
advances an iterator by given distance
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(Funktion) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/iterator/prev&oldid=29411“