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std::equal_range

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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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is_sorted (C++11)
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sort
Opérations binaires de recherche (sur les gammes triés)
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Binary search operations (on sorted ranges)
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binary_search
equal_range
Définir les opérations (sur les gammes triés)
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Set operations (on sorted ranges)
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Opérations Heap
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Heap operations
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Numeric operations
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Bibliothèque C
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C library
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Defined in header <algorithm>
template< class ForwardIt, class T >

std::pair<ForwardIt,ForwardIt>
    equal_range( ForwardIt first, ForwardIt last,

                 const T& value );
(1)
template< class ForwardIt, class T, class Compare >

std::pair<ForwardIt,ForwardIt>
    equal_range( ForwardIt first, ForwardIt last,

                 const T& value, Compare comp );
(2)
Renvoie une plage contenant tous les éléments sont égaux à value dans la gamme [first, last) triés. La plage est définie par deux itérateurs, une pointe vers le premier élément qui est au moins' value et que l'autre pointant vers le premier élément' plus que value. Le premier itérateur peut être obtenue avec lower_bound() alternativement, la seconde - avec upper_bound() .
Original:
Returns a range containing all elements equal to value in the sorted range [first, last). The range is defined by two iterators, one pointing to the first element that is not less than value and another pointing to the first element greater than value. The first iterator may be alternatively obtained with lower_bound(), the second - with upper_bound().
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La première version utilise operator< de comparer les éléments, la deuxième version utilise la fonction de comparaison donnée comp .
Original:
The first version uses operator< to compare the elements, the second version uses the given comparison function comp.
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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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value -
valeur à comparer les éléments d'
Original:
value to compare the elements to
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comp - comparison function which returns ​true if the first argument is less than the second.

The signature of the comparison function should be equivalent to the following:

 bool cmp(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 type Type1 must be such that an object of type T can be implicitly converted to Type1. The type Type2 must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to Type2. ​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[modifier] Retourne la valeur

std::pair contenant une paire d'itérateurs définissant l'intervalle désiré, le premier désignant le premier élément qui est au moins' value que la seconde et pointant vers le premier élément' plus grande que value .
Original:
std::pair containing a pair of iterators defining the wanted range, the first pointing to the first element that is not less than value and the second pointing to the first element greater than value.
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S'il n'y a pas d'éléments' pas moins que value, last est retourné comme le premier élément. Même s'il n'y a pas d'éléments' plus que value, last est retourné comme le deuxième élément
Original:
If there are no elements not less than value, last is returned as the first element. Similarly if there are no elements greater than value, last is returned as the second element
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[modifier] Complexité

Logarithmique de la distance entre first et last
Original:
Logarithmic in the distance between first and last
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[modifier] Mise en œuvre possible

First version
template<class ForwardIt, class T 
std::pair<ForwardIt,ForwardIt> 
    equal_range(ForwardIt first, ForwardIt last,
                const T& value)
{
    return std::make_pair(std::lower_bound(first, last, value),
                          std::upper_bound(first, last, value));
}
Second version
template<class ForwardIt, class T, class Compare>
std::pair<ForwardIt,ForwardIt> 
    equal_range(ForwardIt first, ForwardIt last,
                const T& value, Compare comp);
{
    return std::make_pair(std::lower_bound(first, last, value, comp),
                          std::upper_bound(first, last, value, comp));
}

[modifier] Exemple

#include <algorithm>
#include <vector>
#include <iostream>
 
struct S
{
    int number;
    char name;
 
    S ( int number, char name  )
        : number ( number ), name ( name )
    {}
 
    // only the number is relevant with this comparison
    bool operator< ( const S& s ) const
    {
        return number < s.number;
    }
};
 
 
int main()
{
    std::vector<S> vec = { {1,'A'}, {2,'B'}, {2,'C'}, {2,'D'}, {3,'F'}, {4,'G'} };
 
    S value ( 2, '?' );
 
    auto p = std::equal_range(vec.begin(),vec.end(),value);
 
    for ( auto i = p.first; i != p.second; ++i )
        std::cout << i->name << ' ';
}

Résultat :

B C D

[modifier] Voir aussi

retourne un itérateur sur le premier élément' pas moins que la valeur donnée
Original:
returns an iterator to the first element not less than the given value
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(fonction générique) [edit]
retourne un itérateur sur le premier élément' plus grande qu'une certaine valeur
Original:
returns an iterator to the first element greater than a certain value
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(fonction générique) [edit]
détermine si un élément existe dans une certaine plage
Original:
determines if an element exists in a certain range
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(fonction générique) [edit]