C++ Tuple Library - swap (tuple)

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Description

It exchanges the contents of two tuples.

Declaration

Following is the declaration for std::swap (tuple)

C++98

	
template <class... Types>
   void swap (tuple<Types...>& x, tuple<Types...>& y) noexcept;

C++11

template <class... Types>
   void swap (tuple<Types...>& x, tuple<Types...>& y) noexcept;

Parameters

x,y − These are tuple objects.

Return Value

none

Exceptions

No-throw guarantee − this member function never throws exceptions.

Data races

The members of both pair objects, x and y, are modified.

Example

In below example for std::swap (tuple).

#include <iostream>
#include <tuple>

int main () {
   std::tuple<int,char> a (100,'a');
   std::tuple<int,char> b (200,'b');

   swap(a,b);

   std::cout << "a contains: " << std::get<0>(a) << " and " << std::get<1>(a) << '\n';

   return 0;
}

The output should be like this −

a contains: 200 and b