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

public member function

<functional>

template <class Ret, class... Args>  void swap (function<Ret(Args...)>& x, function<Ret(Args...)>& y);

Exchanges the targets

It behaves as if x.swap(y) was called.

x,y

function objects of the same type (with the same signature, as described by the template parameters Ret and Args...).

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// swapping functions
#include <iostream>     // std::cout
#include <functional>   // std::function, std::plus

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

  swap(foo,bar);

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

  return 0;
}

foo is not callable.
bar is callable.

function::swap

Swap targets (public member function)

swap

Exchange values of two objects (function template)

function::assign

Assign target and allocator (public member function)

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