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std::adjacent_find

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Defined in header <algorithm>
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)
Durchsucht den Bereich [first, last) für zwei aufeinanderfolgende identische Elemente. Die erste Version verwendet operator== um die Elemente zu vergleichen, verwendet die zweite Version des gegebenen binären Prädikats 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.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
das Spektrum der Elemente zu untersuchen
Original:
the range of elements to examine
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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.
The types  Type1 and  Type2 must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to both of them.

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[Bearbeiten] Rückgabewert

ein Iterator auf der ersten der gleiche Elemente. Wenn keine Elemente gefunden werden, wird last zurückgegeben
Original:
an iterator to the first of the identical elements. If no such elements are found, last is returned
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[Bearbeiten] Komplexität

Genau die kleinere der (result - first) und ((last - 1) - first) Anwendungen des Prädikats, wo result ist der Rückgabewert .
Original:
Exactly the smaller of (result - first) and ((last - 1) - first) applications of the predicate where result is the return value.
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[Bearbeiten] Mögliche Implementierung

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;
}

[Bearbeiten] Beispiel

Der folgende Code findet ein Paar äquivalenter ganze Zahlen in einem Array von intergers .
Original:
The following code finds a pair of equivalent integers in an array of intergers.
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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

[Bearbeiten] Siehe auch

removes consecutive duplicate elements in a range
(Funktions-Template) [edit]