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std::adjacent_find

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Bibliothèque d'algorithmes
Fonctions
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Functions
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Non-modification de la séquence des opérations
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Non-modifying sequence operations
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Modification de la séquence des opérations
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Modifying sequence operations
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Des opérations de partitionnement
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Partitioning operations
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Opérations de tri (sur les gammes triés)
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Sorting operations (on sorted ranges)
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Opérations binaires de recherche (sur les gammes triés)
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Binary search operations (on sorted ranges)
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Set operations (on sorted ranges)
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Heap operations
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Numeric operations
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C library
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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)
Recherche dans le [first, last) plage pour deux éléments consécutifs identiques. La première version utilise operator== de comparer les éléments, la deuxième version utilise le prédicat binaire donné 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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Sommaire

[modifier] Paramètres

first, last -
l'éventail des éléments à examiner
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.

[modifier] Retourne la valeur

un itérateur pour le premier des éléments identiques. Si aucun de ces éléments sont trouvés, last est retourné
Original:
an iterator to the first of the identical elements. If no such elements are found, last is returned
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[modifier] Complexité

Exactement les petites applications de (result - first) et ((last - 1) - first) du prédicat result où est la valeur de retour .
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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[modifier] Mise en œuvre possible

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;
}

[modifier] Exemple

Le code suivant recherche une paire d'entiers équivalentes dans un tableau de 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);
    }
}

Résultat :

match at: 4

[modifier] Voir aussi

supprime les doublons successifs dans une plage
Original:
removes consecutive duplicate elements in a range
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(fonction générique) [edit]