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std::equal

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< cpp‎ | algorithm

 
 
Algoritmo biblioteca
Funciones
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Functions
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Para no modificar la secuencia de las operaciones
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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
Modificación de la secuencia de operaciones
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Modifying sequence operations
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Particionamiento operaciones
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Partitioning operations
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Clasificación de las operaciones (en rangos ordenados)
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Sorting operations (on sorted ranges)
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Las operaciones binarias de búsqueda (en rangos ordenados)
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Binary search operations (on sorted ranges)
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Conjunto de operaciones (en rangos ordenados)
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Set operations (on sorted ranges)
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Operaciones del montón
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Heap operations
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Mínimo / máximo de operaciones
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Minimum/maximum operations
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Operaciones numéricas
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Numeric operations
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C biblioteca
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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)
Regreso true si los elementos son los mismos en dos gamas: una de ellas definida por [first1, last1) y otro a partir de first2. La primera versión de la función utiliza operator== para comparar los elementos, el segundo utiliza el predicado binario dado 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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Contenido

[editar] Parámetros

first1, last1 -
el primer rango de los elementos para comparar
Original:
the first range of the elements to compare
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first2 -
a partir de la segunda gama de los elementos para comparar
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.

[editar] Valor de retorno

true si los elementos en los dos intervalos son iguales
Original:
true if the elements in the two ranges are equal
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[editar] Notas

std::equal no puede ser utilizado para comparar los intervalos formados por los iteradores de std::unordered_set, std::unordered_multiset, std::unordered_map, o std::unordered_multimap porque el orden en el que los elementos se almacenan en los contenedores puede ser diferente incluso si los dos recipientes almacenar los mismos elementos .
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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[editar] Complejidad

A lo sumo last1 - first1 aplicaciones del predicado
Original:
At most last1 - first1 applications of the predicate
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[editar] Posible implementación

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;
}

[editar] Ejemplo

El código siguiente utiliza equal() para probar si una cadena es un palíndromo
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
encuentra el primer elemento que satisfaga los criterios específicos
Original:
finds the first element satisfying specific criteria
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(función de plantilla) [edit]
devuelve true si el rango es menor que otro lexicográfico
Original:
returns true if one range is lexicographically less than another
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(función de plantilla) [edit]
encuentra la primera posición donde dos rangos diferentes
Original:
finds the first position where two ranges differ
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(función de plantilla) [edit]
searches for a range of elements
(función de plantilla) [edit]