dynamic_methods.cpp

#include <functional>

using namespace std;

class Test
{
	public:
		Test();
		void say_hello(string way);
	private:
		typedef void (Test::*hellomethod_t) (string name);
		map <string, hellomethod_t> methods;
		void hello1(string name) { cout << "hello1, " << name << endl; }
		void hello2(string name) { cout << "hello2, " << name << endl; }
};

Test::Test()
{
	methods["way1"] = &Test::hello1;
}

void Test::say_hello(string way)
{
	hellomethod_t fn = methods[way];
	(this->*fn)(string("Bob"));
}

int main()
{
	Test t;
	t.say_hello("way1");
}