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std::iter_swap

Da cppreference.com.
< 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 ForwardIt1, class ForwardIt2 >
void iter_swap( ForwardIt1 a, ForwardIt2 b );
Scambia i valori degli elementi indicati sono gli iteratori che punta a.
Original:
Swaps the values of the elements the given iterators are pointing to.
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Indice

[modifica] Parametri

a, b -
iteratori agli elementi da scambiare
Original:
iterators to the elements to swap
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Type requirements
-
ForwardIt1, ForwardIt2 must meet the requirements of ForwardIterator.
-
*a, *b must meet the requirements of Swappable.

[modifica] Valore di ritorno

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

costante
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constant
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[modifica] Possibile implementazione

template<class ForwardIt1, class ForwardIt2>
void iter_swap(ForwardIt1 a, ForwardIt2 b)
{
   using std::swap;
   swap(*a, *b);
}

[modifica] Esempio

Il seguente è un implementazione di ordinamento per selezione in C + +
Original:
The following is an implementation of selection sort in C++
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#include <random>
#include <vector>
#include <iostream>
#include <algorithm>
#include <functional>
#include <iterator>
 
template<class ForwardIt>
void selection_sort(ForwardIt begin, ForwardIt end)
{
    for (ForwardIt i = begin; i != end; ++i)
        std::iter_swap(i, std::min_element(i, end));
}
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dist(-10, 10);
    std::vector<int> v;
    generate_n(back_inserter(v), 20, bind(dist, gen));
 
    std::cout << "Before sort: ";
    copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, " "));
 
    selection_sort(v.begin(), v.end());
 
    std::cout << "\nAfter sort: ";
    copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, " "));
    std::cout << '\n';
}

Output:

Before sort: -7 6 2 4 -1 6 -9 -1 2 -5 10 -9 -5 -3 -5 -3 6 6 1 8
After sort: -9 -9 -7 -5 -5 -5 -3 -3 -1 -1 1 2 2 4 6 6 6 6 8 10

[modifica] Vedi anche

scambia i valori di due oggetti
Original:
swaps the values of two objects
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(funzione di modello) [edit]
Scambia due gamme di elementi
Original:
swaps two ranges of elements
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(funzione di modello) [edit]