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std::copy_backward

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< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
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Functions
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Non modifica le operazioni di sequenza
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Non-modifying sequence operations
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Modifica delle operazioni di sequenza
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Modifying sequence operations
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Partizionamento operazioni
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Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
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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 BidirIt1, class BidirIt2 >
BidirIt2 copy_backward( BidirIt1 first, BidirIt1 last, BidirIt2 d_last );
Copia gli elementi della gamma, definito da [first, last), ad un altro intervallo termina a d_last. Gli elementi vengono copiati in ordine inverso (l'ultimo elemento viene copiato prima), ma il loro ordine relativo è conservato.
Original:
Copies the elements from the range, defined by [first, last), to another range ending at d_last. The elements are copied in reverse order (the last element is copied first), but their relative order is preserved.
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Indice

[modifica] Parametri

first, last -
la gamma degli elementi da copiare
Original:
the range of the elements to copy
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d_last -
fine del campo di destinazione. Se d_last è all'interno [first, last), std::copy deve essere usato al posto di std::copy_backward .
Original:
end of the destination range. If d_last is within [first, last), std::copy must be used instead of std::copy_backward.
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Type requirements
-
BidirIt must meet the requirements of BidirectionalIterator.

[modifica] Valore di ritorno

iteratore per l'ultimo elemento copiato.
Original:
iterator to the last element copied.
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[modifica] Complessità

Esattamente last - first incarichi.
Original:
Exactly last - first assignments.
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[modifica] Possibile implementazione

template< class BidirIt1, class BidirIt2 >
BidirIt2 copy_backward(BidirIt1 first, BidirIt1 last, BidirIt2 d_last)
{
    while (first != last) {
        *(--d_last) = *(--last);
    }
    return d_last;
}

[modifica] Esempio

#include <algorithm>
#include <iostream>
 
int main()
{
    std::vector<int> from_vector;
    for (int i = 0; i < 10; i++) {
        from_vector.push_back(i);
    }
 
    std::vector<int> to_vector(15);
 
    std::copy_backward(from_vector.begin(), from_vector.end(), to_vector.end());
 
    std::cout << "to_vector contains: ";
    for (unsigned int i = 0; i < to_vector.size(); i++) {
        std::cout << to_vector[i] << " ";
    }
 }

Output:

to_vector contains: 0 0 0 0 0 0 1 2 3 4 5 6 7 8 9

[modifica] Vedi anche

copia un intervallo di elementi in una nuova posizione
Original:
copies a range of elements to a new location
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(funzione di modello) [edit]