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

public member function

<functional>

explicit operator bool() const noexcept;

Check if callable

A function object is callable if it is not an empty function (i.e., if it has a callable object as target).

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// function::operator bool 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;
}

foo is not callable.
bar is callable.

function::target

Get pointer to target (public member function)

function::operator()

Call target (public member function)

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