#include <iostream>
#include <functional>
#include <unordered_map>
#include <string>
using namespace std;
 
int main() {
	string greetings = "Hello, you filthy world!";
 
	unordered_map<string, function<void()>> menu = {
		{"Foo", []{ cout << "Foo" << endl; }},
		{"Greet", [&]{ cout << greetings << endl; }}
	};
 
	for(auto const & menu_item: menu){
		cout << "> " << menu_item.first << endl;
	}
 
	string decision;
	cin >> decision;
	menu.at(decision)();
 
	return 0;
}

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

R3JlZXQ=

Greet