Namespace
Varianti

std::equal

Da cppreference.com.
< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
Original:
Functions
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Non modifica le operazioni di sequenza
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Non-modifying sequence operations
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all_of
any_of
none_of
(C++11)
(C++11)
(C++11)
for_each
count
count_if
mismatch
equal
Modifica delle operazioni di sequenza
Original:
Modifying sequence operations
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Partizionamento operazioni
Original:
Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
Original:
Sorting operations (on sorted ranges)
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Binarie (le operazioni di ricerca sui campi ordinati)
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Binary search operations (on sorted ranges)
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Impostare le operazioni (su intervalli ordinati)
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Set operations (on sorted ranges)
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Heap operazioni
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Heap operations
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Minimo / massimo le operazioni
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Minimum/maximum operations
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Operazioni numeriche
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Numeric operations
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Libreria C
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C library
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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)
Restituisce true se gli elementi sono gli stessi in due gruppi: uno definito da [first1, last1) e un altro a partire da first2. La prima versione della funzione utilizza operator== per confrontare gli elementi, il secondo utilizza il predicato binario dato 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.
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Indice

[modifica] Parametri

first1, last1 -
la prima gamma di elementi da confrontare
Original:
the first range of the elements to compare
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first2 -
all'inizio del secondo intervallo di elementi da confrontare
Original:
beginning of the second range of the elements to compare
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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 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.

[modifica] Valore di ritorno

true se gli elementi delle due gamme sono uguali
Original:
true if the elements in the two ranges are equal
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[modifica] Note

std::equal non può essere utilizzata per confrontare gli intervalli formate dagli iteratori da std::unordered_set, std::unordered_multiset, std::unordered_map o std::unordered_multimap perché l'ordine in cui sono memorizzati gli elementi in tali contenitori possono essere diversi, anche se i due contenitori memorizzare gli stessi elementi.
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.
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{{{1}}}
Original:
{{{2}}}
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[modifica] Complessità

Al massimo last1 - first1 applicazioni del predicato
Original:
At most last1 - first1 applications of the predicate
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[modifica] Possibile implementazione

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;
}

[modifica] Esempio

Il codice seguente utilizza equal() per verificare se una stringa è un palindromo
Original:
The following code uses equal() to test if a string is a palindrome
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#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");
}

Output:

"radar" is a palindrome
"hello" is not palindrome
trova il primo elemento che soddisfi i criteri specifici
Original:
finds the first element satisfying specific criteria
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(funzione di modello) [edit]
restituisce true se un intervallo è lessicograficamente minore di un altro
Original:
returns true if one range is lexicographically less than another
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(funzione di modello) [edit]
trova la prima posizione in cui due intervalli diversi
Original:
finds the first position where two ranges differ
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(funzione di modello) [edit]
searches for a range of elements
(funzione di modello) [edit]