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std::partition_copy

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< cpp‎ | algorithm

 
 
Algoritmo biblioteca
Funciones
Original:
Functions
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Para no modificar la secuencia de las operaciones
Original:
Non-modifying sequence operations
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Modificación de la secuencia de operaciones
Original:
Modifying sequence operations
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Particionamiento operaciones
Original:
Partitioning operations
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is_partitioned(C++11)
partition
partition_copy(C++11)
Clasificación de las operaciones (en rangos ordenados)
Original:
Sorting operations (on sorted ranges)
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Las operaciones binarias de búsqueda (en rangos ordenados)
Original:
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 OutputIt1,

          class OutputIt2, class UnaryPredicate >
std::pair<OutputIt1, OutputIt2>
     partition_copy(InputIt first, InputIt last,
                    OutputIt1 d_first_true, OutputIt2 d_first_false,

                    UnaryPredicate p);
(desde C++11)
Copia los elementos que satisfacen el predicado de la p [first, last) amplia gama de principios en d_first_true y copia los elementos que no cumplan p al inicio de arena a d_first_false .
Original:
Copies the elements that satisfy the predicate p from the range [first, last) to the range beginning at d_first_true, and copies the elements that do not satisfy p to the range beginning at d_first_false.
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Contenido

[editar] Parámetros

first, last -
la gama de elementos a ordenar
Original:
the range of elements to sort
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d_first_true -
el comienzo del rango de salida para los elementos que satisfacen p
Original:
the beginning of the output range for the elements that satisfy p
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d_first_false -
el comienzo del rango de salida para los elementos que no satisfacen p
Original:
the beginning of the output range for the elements that do not satisfy p
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p - unary predicate which returns ​true
si el elemento debe ser colocado en d_first_true
Original:
if the element should be placed in d_first_true
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.

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

 bool pred(const Type &a);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The type Type must be such that an object of type InputIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.
-
OutputIt1 must meet the requirements of OutputIterator.
-
OutputIt2 must meet the requirements of OutputIterator.

[editar] Valor de retorno

Un pair construido a partir de la iterador al final del intervalo de d_first_true y el iterador al final del intervalo de d_first_false .
Original:
A pair constructed from the iterator to the end of the d_first_true range and the iterator to the end of the d_first_false range.
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[editar] Complejidad

Exactamente distance(first, last) aplicaciones de p .
Original:
Exactly distance(first, last) applications of p.
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[editar] Posible implementación

template<class InputIt, class OutputIt1,
         class OutputIt2, class UnaryPredicate>
std::pair<OutputIt1, OutputIt2>
    partition_copy(InputIt first, InputIt last,
                   OutputIt1 d_first_true, OutputIt2 d_first_false,
                   UnaryPredicate p)
{
    while (first != last) {
        if (p(*first)) {
            *d_first_true = *first;
            ++d_first_true;
        } else {
            *d_first_false = *first;
            ++d_first_false;
        }
        ++first;
    }
    return std::pair<OutputIt1, OutputIt2>(d_first_true, d_first_false);
}

[editar] Ejemplo

#include <iostream>
#include <algorithm>
#include <utility>
 
int main()
{
    int arr [10] = {1,2,3,4,5,6,7,8,9,10};
    int true_arr [5] = {0};
    int false_arr [5] = {0};
 
    std::partition_copy(std::begin(arr), std::end(arr), std::begin(true_arr),std::begin(false_arr),
                        [] (int i) {return i > 5;});
 
    std::cout << "true_arr: ";
    for (auto it = std::begin(true_arr); it != std::end(true_arr); ++it) {
        std::cout << *it << ' ';
    }
    std::cout << '\n'; 
 
    std::cout << "false_arr: ";
    for (auto it = std::begin(false_arr); it != std::end(false_arr); ++it) {
        std::cout << *it << ' ';
    }
    std::cout << '\n'; 
 
    return 0;
 
}

Output:

true_arr: 6 7 8 9 10
false_arr: 1 2 3 4 5

[editar] Ver también

divide una serie de elementos en dos grupos
Original:
divides a range of elements into two groups
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(función de plantilla) [edit]
elementos divide en dos grupos, preservando su orden relativo
Original:
divides elements into two groups while preserving their relative order
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(función de plantilla) [edit]