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std::partition_copy

Da cppreference.com.
< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
Original:
Functions
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Non modifica le operazioni di sequenza
Original:
Non-modifying sequence operations
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Modifica delle operazioni di sequenza
Original:
Modifying sequence operations
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Partizionamento operazioni
Original:
Partitioning operations
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is_partitioned(C++11)
partition
partition_copy(C++11)
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 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);
(dal C++11)
Copia gli elementi che soddisfano la p predicato dal [first, last) gamma all'inizio gamma a d_first_true, e copia gli elementi che non soddisfano p all'inizio gamma 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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Indice

[modifica] Parametri

first, last -
la gamma di elementi da ordinare
Original:
the range of elements to sort
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d_first_true -
l'inizio del campo di uscita per gli elementi che soddisfano p
Original:
the beginning of the output range for the elements that satisfy p
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d_first_false -
l'inizio del campo di uscita per gli elementi che non soddisfano 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
se l'elemento deve essere posto in 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.

[modifica] Valore di ritorno

Un pair costruito dal iteratore alla fine del campo d_first_true e l'iteratore alla fine del campo 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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[modifica] Complessità

Esattamente distance(first, last) applicazioni di p.
Original:
Exactly distance(first, last) applications of p.
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[modifica] Possibile implementazione

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);
}

[modifica] Esempio

#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

[modifica] Vedi anche

divide una serie di elementi in due gruppi
Original:
divides a range of elements into two groups
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(funzione di modello) [edit]
divide gli elementi in due gruppi, mantenendo l'ordine relativo
Original:
divides elements into two groups while preserving their relative order
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(funzione di modello) [edit]