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

public member function

<functional>

std::function::swap 
void swap (function& x) noexcept;

Swap targets

Exchanges the target callable object stored in the object by the one in x.

Parameters
x
A function object of the same type (with the same signature, as described by its template parameters).

Return value none

Example 
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// function::swap example
#include <iostream>     // std::cout
#include <functional>   // std::function, std::plus

int main () {
  std::function<int(int,int)> foo,bar;
  foo = std::plus<int>();

  foo.swap(bar);

  std::cout << "foo is " << (foo ? "callable" : "not callable") << ".\n";
  std::cout << "bar is " << (bar ? "callable" : "not callable") << ".\n";

  return 0;
}

Output: 
foo is not callable.
bar is callable.


Data races Both *this and x are modified.

Exception safetyNo-throw guarantee: this member function never throws exceptions.

See also
swap (function)
Exchanges the targets (public member function)
function::operator=
Assign function object (public member function)

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