std::iter_swap - cppreference.com

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Elemento definito nell'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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Parametri

a, b	-	iteratori agli elementi da scambiare Original: iterators to the elements to swap The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Type requirements
-`ForwardIt1, ForwardIt2` must meet the requirements of `ForwardIterator`.
-`a, b` must meet the requirements of `Swappable`.

Valore di ritorno

(Nessuno)

Original:

(none)

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Complessità

costante

Original:

constant

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Possibile implementazione

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

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

Vedi anche


	scambia i valori di due oggetti Original: swaps the values of two objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello) [modifica]

	Scambia due gamme di elementi Original: swaps two ranges of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello) [modifica]