std_functional.org

C++ 17 std::functional

std::function is a templated object that is used to store and call any callable type, such as functions, objects, lambdas and the result of std::bind

source code from: https://shaharmike.com/cpp/lambdas-and-functions/#std-function

#include <iostream>
#include <functional>

using namespace std;


void global_f()
{
	cout << "global_f()" << endl;
}

struct Functor
{
	void operator()() {cout << "Functor" << endl;}
};

int main()
{
	std::function<void()> f;
	cout << "sizeof(f): " << sizeof(f) << endl;
	
	f = global_f;
	f();
	
	f = [](){cout << "lambda" << endl;};
	f();
	
	Functor functor;
	f = functor;
	f();
	
	f = std::bind(global_f);
	f();
		
	return 0;
}