#include <iostream>
#include <vector>
#include <memory>
#include <random>
 
using namespace std;
 
struct GO { virtual void say_hello()=0; };
struct A:GO { void say_hello() { cout<<"I'm a warefulf\n";} };
struct B:GO { void say_hello() { cout<<"I'm a soldier\n";}};
 
template <class T> 
shared_ptr<GO> generator() {
	return make_shared<T>(); 
};
 
typedef shared_ptr<GO> (*gen_fn)();
vector <gen_fn> generators{generator<A>, generator<B>};
 
int main() {
	vector<shared_ptr<GO>> universe; 
 
	default_random_engine generator;
    uniform_int_distribution<int> distribution(0,generators.size()-1);
 
    for (int i=0; i<10; i++) {   
        int mytype = distribution(generator); 
        universe.push_back(generators[mytype]()); 
    }
 
    for (auto x: universe) 
        x->say_hello(); 
	return 0;
}

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