C++ Function as Parameter

main.cpp

#include <iostream>

// Compile & run with: g++ main.cpp -o main && ./main

using namespace std;

void caller(std::function<void(string)> func, string arg = "World") {

	func(arg);

}

void sayHello(string name) {

	cout << "Hello, " << name << "!" << endl;

}

int main() {

	caller(sayHello, "papa");

	return 0;

}