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std::unique_copy

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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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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 InputIt, class OutputIt >

ForwardIt unique_copy( InputIt first, InputIt last,

                       OutputIt d_first );
(1)
template< class InputIt, class OutputIt, class BinaryPredicate >

ForwardIt unique_copy( InputIt first, InputIt last,

                       OutputIt d_first, BinaryPredicate p );
(2)
Copia los elementos de la [first, last) rango, a otro principio rango en d_first de tal manera que no hay elementos iguales consecutivos. Sólo el primer elemento de cada grupo de elementos iguales se copia. La primera versión utiliza operator== para comparar los elementos, la segunda versión utiliza el predicado binario dado p .
Original:
Copies the elements from the range [first, last), to another range beginning at d_first in such a way that there are no consecutive equal elements. Only the first element of each group of equal elements is copied. The first version uses operator== to compare the elements, the second version uses the given binary predicate p.
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Contenido

[editar] Parámetros

first, last -
el intervalo de elementos de proceso
Original:
the range of elements to process
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d_first -
el comienzo del rango de destino
Original:
the beginning of the destination range
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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
-
InputIt must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.
-
The type of dereferenced InputIt must meet the requirements of CopyAssignable.
-
The type of dereferenced InputIt must meet the requirements of CopyConstructible. if neither InputIt nor OutputIt satisfies ForwardIterator

[editar] Valor de retorno

Salida de iterador al elemento más allá del último elemento escrito
Original:
Output iterator to the element past the last written element
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[editar] Posible implementación

First version
template<class ForwardIt, class OutputIt>
ForwardIt unique_copy(ForwardIt first, ForwardIt last,
                      OutputIt d_first)
{
 
    if (first == last)
        return d_first;
 
    *d_first = *first;
     while (++first != last) {
        if (!(*d_first == *first)) {
            *(++d_first) = *first;
        }
    }
    return ++d_first;
}
Second version
template<class ForwardIt, class OutputIt, class BinaryPredicate>
ForwardIt unique_copy(ForwardIt first, ForwardIt last,
                            OutputIt d_first, BinaryPredicate p)
{
 
    if (first == last)
        return d_first;
 
    *d_first = *first;
    while (++first != last) {
        if (!p(*result, *first)) {
            *(++d_first) = *first;
        }
    }
    return ++d_first;
}

[editar] Ejemplo

Los adornos de los siguientes programas todos los múltiples espacios consecutivos en una cadena constante e imprime el resultado
Original:
The following program trims all multiple consecutive spaces in a const string and prints the result
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#include <string>
#include <iostream>
#include <algorithm>
#include <iterator>
 
int main()
{
    std::string s1 = "The      string    with many       spaces!";
    std::cout << "before: " << s1 << '\n';
 
    std::string s2;
    std::unique_copy(s1.begin(), s1.end(), std::back_inserter(s2),
                     [](char c1, char c2){ return c1 == ' ' && c2 == ' '; });
 
    std::cout << "after:  " << s2 << '\n';
}

Output:

before: The      string    with many       spaces!
after:  The string with many spaces!

[editar] Complejidad

lineal en la distancia entre first y last
Original:
linear in the distance between first and last
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[editar] Ver también

encuentra dos idénticas (o alguna otra relación) elementos adyacentes el uno al otro
Original:
finds two identical (or some other relationship) items adjacent to each other
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(función de plantilla) [edit]
removes consecutive duplicate elements in a range
(función de plantilla) [edit]