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Showing content from https://cplusplus.com/reference/stack/stack/swap/ below:

public member function

<stack>

std::stack::swap 
void swap (stack& x) noexcept(/*see below*/);

Swap contents

Exchanges the contents of the container adaptor (*this) by those of x.

This member function calls the non-member function swap (unqualified) to swap the underlying containers.

The noexcept specifier matches the swap operation on the underlying container.



Parameters
x
Another stack container adaptor of the same type (i.e., instantiated with the same template parameters, T and Container). Sizes may differ.

Return value none

Example 
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// stack::swap
#include <iostream>       // std::cout
#include <stack>          // std::stack

int main ()
{
  std::stack<int> foo,bar;
  foo.push (10); foo.push(20); foo.push(30);
  bar.push (111); bar.push(222);

  foo.swap(bar);

  std::cout << "size of foo: " << foo.size() << '\n';
  std::cout << "size of bar: " << bar.size() << '\n';

  return 0;
}

Output: 
size of foo: 2
size of bar: 3


Complexity Constant.

Data races Both *this and x are modified.

Exception safety Provides the same level of guarantees as the operation performed on the underlying container objects.

See also
swap (stack)
Exchange contents of stacks (public member function)
swap
Exchange values of two objects (function template)

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