std::tuple::swap

 

C++

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Technical Specifications

 

Utilities library

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rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=

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pair

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Swap, forward and move

swap

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declval (C++11)

 

std::tuple

Member functions

tuple::tuple

tuple::operator=

tuple::swap

Non-member functions

make_tuple

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operator==operator!=operator<operator<=operator>operator>=

std::swap

get

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ignore

 

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&>())) &&
    ...

)

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)