std::swap(std::tuple)

 

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tuple::swap

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operator==operator!=operator<operator<=operator>operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

swap(std::tuple)

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Defined in header <tuple>
	(1)
template<class... Types> void swap(std::tuple<Types...>& lhs,            std::tuple<Types...>& rhs )noexcept(/* see below */);			(since C++11) (until C++20)
template<class... Types> constexprvoid swap(std::tuple<Types...>& lhs,                      std::tuple<Types...>& rhs )noexcept(/* see below */);			(since C++20)
template<class... Types> constexprvoid swap(conststd::tuple<Types...>& lhs,                      conststd::tuple<Types...>& rhs )noexcept(/* see below */);		(2)	(since C++23)

Swaps the contents of lhs and rhs. Equivalent to lhs.swap(rhs).

1) This overload participates in overload resolution only if std::is_swappable_v<Ti> is true for all i from 0 to sizeof...(Types). 2) This overload participates in overload resolution only if std::is_swappable_v<const Ti> is true for all i from 0 to sizeof...(Types).

(since C++17)

Parameters

lhs, rhs

-

tuples whose contents to swap

Return value

(none)

Exceptions

noexcept specification:  

noexcept(noexcept(lhs.swap(rhs)))

Example

Run this code

#include <iostream>#include <string>#include <tuple>   int main(){std::tuple<int, std::string, float> p1{42, "ABCD", 2.71}, p2; p2 =std::make_tuple(10, "1234", 3.14);   auto print_p1_p2 =[&](auto rem){std::cout<< rem <<"p1 = {"<< std::get<0>(p1)<<", "<< std::get<1>(p1)<<", "<< std::get<2>(p1)<<"}, "<<"p2 = {"<< std::get<0>(p2)<<", "<< std::get<1>(p2)<<", "<< std::get<2>(p2)<<"}\n";};   print_p1_p2("Before p1.swap(p2): "); p1.swap(p2); print_p1_p2("After p1.swap(p2): "); swap(p1, p2); print_p1_p2("After swap(p1, p2): ");}

Output:

Before p1.swap(p2): p1 = {42, ABCD, 2.71}, p2 = {10, 1234, 3.14} After p1.swap(p2): p1 = {10, 1234, 3.14}, p2 = {42, ABCD, 2.71} After swap(p1, p2): p1 = {42, ABCD, 2.71}, p2 = {10, 1234, 3.14}

See also

swap	swaps the contents of two tuples (public member function)
std::swap(std::pair) (C++11)	specializes the std::swap algorithm (function template)