std::prev – cppreference.com
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(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 The text has been machine-translated via Google Translate. |
| n | - | Anzahl der Elemente Original: number of elements The text has been machine-translated via Google Translate. |
| Type requirements | ||
-BidirIt must meet the requirements of BidirectionalIterator.
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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:
Siehe auch
inkrementieren einen Iterator Original: increment an iterator The text has been machine-translated via Google Translate. (Funktion) [edit] | |
Fortschritte einen Iterator gegeben durch Distanz Original: advances an iterator by given distance The text has been machine-translated via Google Translate. (Funktion) [edit] | |