std::tuple::swap

 

C++

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optional

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std::tuple

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tuple::swap

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std::swap

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Defined in header <tuple>
void swap( tuple& other );		(since C++11)

Calls swap (which might be std::swap, or might be found via ADL) for each element in *this and its corresponding element in other.

Parameters

other

-

tuple of values to swap

Return value

(none)

Exceptions

noexcept specification:   noexcept(     noexcept(swap(std::declval<T0&>>(), std::declval<T0&>())) &&     noexcept(swap(std::declval<T1&>>(), std::declval<T1&>())) &&     noexcept(swap(std::declval<T2&>>(), std::declval<T2&>())) &&     ... )	(until C++17)
noexcept specification:   noexcept(     std::is_nothrow_swappable<T0>::value &&     std::is_nothrow_swappable<T1>::value &&     std::is_nothrow_swappable<T2>::value &&     ... )	(since C++17)

Example

Run this code

#include <iostream>
#include <tuple>
#include <string>
 
int main()
{
    std::tuple<int, std::string, float> p1, p2;
    p1 = std::make_tuple(10, "test", 3.14);
    p2.swap(p1);
    std::cout << "("  << std::get<0>(p2)
              << ", " << std::get<1>(p2)
              << ", " << std::get<2>(p2) << ")\n";
}

Output:

(10, test, 3.14)