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

class IProduct {
public:
  virtual std::string Name() = 0;
  virtual bool Say() = 0;
  virtual ~IProduct() {}
};

using Product = std::shared_ptr<IProduct>;

class IFactory {
public:
  Product Create(const std::string& owner) {
    Product p = CreateClass(owner);
    RegisterClass(p);
    return p;
  }
  virtual ~IFactory() {}
protected:
  virtual Product CreateClass(const std::string&) = 0;
  virtual void RegisterClass(Product p) = 0;
};

class A : public IProduct {
  std::string owner;
public:
  A(const std::string& owner) {
    this->owner = owner;
  }
  std::string Name() {
    return owner;
  }
  bool Say() {
    std::cout << "Baw " << X << std::endl;
    return true;
  }
private:
  int X = 123;
};

class B : public IProduct {
  std::string owner;
public:
  B(const std::string& owner) {
    this->owner = owner;
  }
  std::string Name() {
    return owner;
  }
  bool Say() {
    std::cout << "Maw " << X << std::endl;
    return true;
  }
protected:
  char X = 'b';
};

class ClassFactory : public IFactory {
  std::vector<std::string> owners;
protected:
  Product CreateClass(const std::string& owner) {
    if (owner == "A")
      return std::make_shared<A>(owner);
    else if (owner == "B")
      return std::make_shared<B>(owner);
    else
      return nullptr;
  }
  void RegisterClass(Product p) {
    owners.push_back(p->Name());
  }
};

int main()
{
  auto factory = std::make_shared<ClassFactory>();

  auto x = factory->Create("A");
  std::cout << x->Name() << std::endl;
  std::cout << std::boolalpha << x->Say() << std::endl;

  auto y = factory->Create("B");
  std::cout << y->Name() << std::endl;
  std::cout << std::boolalpha << y->Say() << std::endl;
}

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