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std::inplace_merge

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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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merge
inplace_merge
includes
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 BidirIt >
void inplace_merge( BidirIt first, BidirIt middle, BidirIt last );
(1)
template< class BidirIt, class Compare>
void inplace_merge( BidirIt first, BidirIt middle, BidirIt last, Compare comp );
(2)
Unisce due intervalli consecutivi ordinati [first, middle) e [middle, last) in una gamma [first, last) ordinati. L'ordine degli elementi uguali è garantito per essere preservato. La prima versione utilizza operator< di confrontare gli elementi, la seconda versione utilizza la funzione di confronto dato comp.
Original:
Merges two consecutive sorted ranges [first, middle) and [middle, last) into one sorted range [first, last). The order of equal elements is guaranteed to be preserved. The first version uses operator< to compare the elements, the second version uses the given comparison function comp.
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Indice

[modifica] Parametri

first -
l'inizio del primo intervallo ordinato
Original:
the beginning of the first sorted range
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middle -
alla fine del primo intervallo ordinati e l'inizio del secondo
Original:
the end of the first sorted range and the beginning of the second
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last -
la fine del secondo intervallo ordinato
Original:
the end of the second sorted range
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comp - comparison function which returns ​true if the first argument is less than the second.

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

 bool cmp(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 BidirIt can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
BidirIt must meet the requirements of ValueSwappable and BidirectionalIterator.
-
The type of dereferenced BidirIt must meet the requirements of MoveAssignable and MoveConstructible.

[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Complessità

Esattamente N-1 confronti se un numero sufficiente di memoria aggiuntiva è disponibile, altrimenti N·log(N) dove N = std::distance(first, last).
Original:
Exactly N-1 comparisons if enough additional memory is available, otherwise N·log(N) where N = std::distance(first, last).
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[modifica] Note

Questa funzione tenta di allocare un buffer temporaneo, di solito chiamando std::get_temporary_buffer. Se l'allocazione non riesce, l'algoritmo meno efficiente è scelto.
Original:
This function attempts to allocate a temporary buffer, typically by calling std::get_temporary_buffer. If the allocation fails, the less efficient algorithm is chosen.
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[modifica] Esempio

Il seguente codice è un'implementazione di merge sort .
Original:
The following code is an implementation of merge sort.
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#include <vector>
#include <iostream>
#include <algorithm>
 
template<class Iter>
void merge_sort(Iter first, Iter last)
{
    if (last - first > 1) {
        Iter middle = first + (last - first) / 2;
        merge_sort(first, middle);
        merge_sort(middle, last);
        std::inplace_merge(first, middle, last);
    }
}
 
int main()
{
    std::vector<int> v{8, 2, -2, 0, 11, 11, 1, 7, 3};
    merge_sort(v.begin(), v.end());
    for(auto n : v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

Output:

-2 0 1 2 3 7 8 11 11

[modifica] Vedi anche

unisce due campi ordinati
Original:
merges two sorted ranges
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(funzione di modello) [edit]
ordina una serie in ordine crescente
Original:
sorts a range into ascending order
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(funzione di modello) [edit]
Ordina un intervallo di elementi, mantenendo ordine tra elementi uguali
Original:
sorts a range of elements while preserving order between equal elements
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(funzione di modello) [edit]