std::adjacent_find
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| Elemento definito nell'header <algorithm>
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| template< class ForwardIt > ForwardIt adjacent_find( ForwardIt first, ForwardIt last ); |
(1) | |
| template< class ForwardIt, BinaryPredicate p > ForwardIt adjacent_find( ForwardIt first, ForwardIt last, BinaryPredicate p ); |
(2) | |
Cerca il
[first, last) gamma per due elementi consecutivi uguali. La prima versione utilizza operator== di confrontare gli elementi, la seconda versione utilizza il predicato binario dato p. Original:
Searches the range
[first, last) for two consecutive identical elements. The first version uses operator== to compare the elements, the second version uses the given binary predicate p. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Indice |
[modifica] Parametri
| first, last | - | la gamma di elementi da esaminare
Original: the range of elements to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| p | - | binary predicate which returns true if the elements should be treated as equal. The signature of the predicate function should be equivalent to the following: bool pred(const Type1 &a, const Type2 &b); The signature does not need to have const &, but the function must not modify the objects passed to it. |
| Type requirements | ||
-ForwardIt must meet the requirements of ForwardIterator.
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[modifica] Valore di ritorno
un iteratore al primo degli elementi identici. Se non tali elementi si trovano,
last viene restituitoOriginal:
an iterator to the first of the identical elements. If no such elements are found,
last is returnedThe text has been machine-translated via Google Translate.
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[modifica] Complessità
Esattamente le applicazioni più piccole e di
(result - first) ((last - 1) - first) del predicato in cui result è il valore di ritorno.Original:
Exactly the smaller of
(result - first) and ((last - 1) - first) applications of the predicate where result is the return value.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[modifica] Possibile implementazione
| First version |
|---|
template<class ForwardIt> ForwardIt adjacent_find(ForwardIt first, ForwardIt last) { if (first == last) { return last; } ForwardIt next = first; ++next; for (next != last; ++next, ++first) { if (*first == *next) { return first; } } return last; } |
| Second version |
template<class ForwardIt, BinaryPredicate p> ForwardIt adjacent_find(ForwardIt first, ForwardIt last, BinaryPredicate p) { if (first == last) { return last; } ForwardIt next = first; ++next; for (next != last; ++next, ++first) { if (p(*first, *next)) { return first; } } return last; } |
[modifica] Esempio
Il codice riportato di seguito trova una coppia di interi equivalenti in una vasta gamma di intergers .
Original:
The following code finds a pair of equivalent integers in an array of intergers.
The text has been machine-translated via Google Translate.
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#include <algorithm> #include <iostream> int main() { std::vector<int> v1{0, 1, 2, 3, 40, 40, 5}; std::vector<int>::iterator result; result = std::adjacent_find(v1.begin(), v1.end()); if (result == v1.end()) { std::cout << "no matching adjacent elements"; } else { std::cout << "match at: " << std::distance(v1.begin(), result); } }
Output:
match at: 4
[modifica] Vedi anche
| removes consecutive duplicate elements in a range (funzione di modello) | |
