Push multiple types onto same vector

//NOT BY ME
// http://stackoverflow.com/questions/13461869/c-push-multiple-types-onto-vector


#include <iostream>
#include <string>
#include <vector>
#include <memory>

class any_type
{
public:
   virtual ~any_type() {}
   virtual void print() = 0;
};

template <class T>
class concrete_type : public any_type
{
public:
   concrete_type(const T& value) : value_(value)
   {}

   virtual void print()
   {
      std::cout << value_ << '\n';
   }
private:
   T value_;
};

int main()
{
   std::vector<std::unique_ptr<any_type>> v(2);

   v[0].reset(new concrete_type<int>(99));
   v[1].reset(new concrete_type<std::string>("Bottles of Beer"));

   for(size_t x = 0; x < 2; ++x)
   {
      v[x]->print();
   }

   return 0;
}