Espaces de noms
Variantes
Affichages
Actions

std::equal

De cppreference.com
< cpp‎ | algorithm

 
 
Bibliothèque d'algorithmes
Fonctions
Original:
Functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Non-modification de la séquence des opérations
Original:
Non-modifying sequence operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
all_of
any_of
none_of
(C++11)
(C++11)
(C++11)
for_each
count
count_if
mismatch
equal
Modification de la séquence des opérations
Original:
Modifying sequence operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Des opérations de partitionnement
Original:
Partitioning operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Opérations de tri (sur les gammes triés)
Original:
Sorting operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
is_sorted (C++11)
is_sorted_until (C++11)
sort
Opérations binaires de recherche (sur les gammes triés)
Original:
Binary search operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Définir les opérations (sur les gammes triés)
Original:
Set operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Opérations Heap
Original:
Heap operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Minimum / maximum de fonctionnement
Original:
Minimum/maximum operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Opérations numériques
Original:
Numeric operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Bibliothèque C
Original:
C library
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 
Defined in header <algorithm>
template< class InputIt1, class InputIt2 >

bool equal( InputIt1 first1, InputIt1 last1,

            InputIt2 first2 );
(1)
template< class InputIt1, class InputIt2, class BinaryPredicate >

bool equal( InputIt1 first1, InputIt1 last1,

            InputIt2 first2, BinaryPredicate p );
(2)
Retours true si les éléments sont les mêmes dans les deux gammes: l'une définie par [first1, last1) et un autre à partir de first2. La première version de la fonction utilise operator== de comparer les éléments, la seconde utilise le prédicat binaire donné p .
Original:
Returns true if the elements are the same in two ranges: one defined by [first1, last1) and another starting at first2. The first version of the function uses operator== to compare the elements, the second 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.

Sommaire

[modifier] Paramètres

first1, last1 -
la première plage des éléments de comparaison
Original:
the first range of the elements to compare
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
first2 -
au début de la seconde plage des éléments de comparaison
Original:
beginning of the second range of the elements to compare
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.
The types  Type1 and  Type2 must be such that objects of types InputIt1 and InputIt2 can be dereferenced and then implicitly converted to  Type1 and  Type2 respectively.

Type requirements
-
InputIt1, InputIt2 must meet the requirements of InputIterator.

[modifier] Retourne la valeur

true si les éléments dans les deux gammes sont égaux
Original:
true if the elements in the two ranges are equal
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Notes

std::equal peut pas être utilisé pour comparer les intervalles formés par les itérateurs de std::unordered_set, std::unordered_multiset, std::unordered_map, ou std::unordered_multimap parce que l'ordre dans lequel les éléments sont stockés dans les récipients peuvent être différents, même si les deux récipients stocker les mêmes éléments .
Original:
std::equal may not be used to compare the ranges formed by the iterators from std::unordered_set, std::unordered_multiset, std::unordered_map, or std::unordered_multimap because the order in which the elements are stored in those containers may be different even if the two containers store the same elements.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
{{{1}}}
Original:
{{{2}}}
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Complexité

Tout au plus last1 - first1 applications du prédicat
Original:
At most last1 - first1 applications of the predicate
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Mise en œuvre possible

First version
template<class InputIt1, class InputIt2>
bool equal(InputIt1 first1, InputIt1 last1, 
           InputIt2 first2)
{
    for (; first1 != last1; ++first1, ++first2) {
        if (!(*first1 == *first2)) {
            return false;
        }
    }
    return true;
}
Second version
template<class InputIt1, class InputIt2, class BinaryPredicate>
bool equal(InputIt1 first1, InputIt1 last1, 
           InputIt2 first2, BinaryPredicate p)
{
    for (; first1 != last1; ++first1, ++first2) {
        if (!p(*first1, *first2)) {
            return false;
        }
    }
    return true;
}

[modifier] Exemple

Le code suivant utilise equal() pour tester si une chaîne est un palindrome
Original:
The following code uses equal() to test if a string is a palindrome
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <iostream>
#include <algorithm>
#include <string>
 
void test(const std::string& s)
{
    if(std::equal(s.begin(), s.begin() + s.size()/2, s.rbegin())) {
        std::cout << "\"" << s << "\" is a palindrome\n";
    } else {
        std::cout << "\"" << s << "\" is not palindrome\n";
    }
}
int main()
{
    test("radar");
    test("hello");
}

Résultat :

"radar" is a palindrome
"hello" is not palindrome
trouve le premier élément répondant à des critères spécifiques
Original:
finds the first element satisfying specific criteria
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction générique) [edit]
renvoie vrai si une plage est lexicographiquement inférieur à un autre
Original:
returns true if one range is lexicographically less than another
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction générique) [edit]
trouve la première position dans laquelle deux plages différentes
Original:
finds the first position where two ranges differ
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction générique) [edit]
recherches pour une série d'éléments
Original:
searches for a range of elements
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction générique) [edit]