fork download
copy 
  1. #include <iostream>
  2. #include <string>
  3. #include <memory>
  4. #include <vector>
  5.  
  6. class IProduct {
  7. public:
  8.   virtual std::string Name() = 0;
  9.   virtual bool Say() = 0;
  10.   virtual ~IProduct() {}
  11. };
  12.  
  13. using Product = std::shared_ptr<IProduct>;
  14.  
  15. class IFactory {
  16. public:
  17.   Product Create(const std::string& owner) {
  18.     Product p = CreateClass(owner);
  19.     RegisterClass(p);
  20.     return p;
  21.   }
  22.   virtual ~IFactory() {}
  23. protected:
  24.   virtual Product CreateClass(const std::string&) = 0;
  25.   virtual void RegisterClass(Product p) = 0;
  26. };
  27.  
  28. class A : public IProduct {
  29.   std::string owner;
  30. public:
  31.   A(const std::string& owner) {
  32.     this->owner = owner;
  33.   }
  34.   std::string Name() {
  35.     return owner;
  36.   }
  37.   bool Say() {
  38.     std::cout << "Baw " << X << std::endl;
  39.     return true;
  40.   }
  41. private:
  42.   int X = 123;
  43. };
  44.  
  45. class B : public IProduct {
  46.   std::string owner;
  47. public:
  48.   B(const std::string& owner) {
  49.     this->owner = owner;
  50.   }
  51.   std::string Name() {
  52.     return owner;
  53.   }
  54.   bool Say() {
  55.     std::cout << "Maw " << X << std::endl;
  56.     return true;
  57.   }
  58. protected:
  59.   char X = 'b';
  60. };
  61.  
  62. class ClassFactory : public IFactory {
  63.   std::vector<std::string> owners;
  64. protected:
  65.   Product CreateClass(const std::string& owner) {
  66.     if (owner == "A")
  67.       return std::make_shared<A>(owner);
  68.     else if (owner == "B")
  69.       return std::make_shared<B>(owner);
  70.     else
  71.       return nullptr;
  72.   }
  73.   void RegisterClass(Product p) {
  74.     owners.push_back(p->Name());
  75.   }
  76. };
  77.  
  78. int main()
  79. {
  80.   auto factory = std::make_shared<ClassFactory>();
  81.  
  82.   auto x = factory->Create("A");
  83.   std::cout << x->Name() << std::endl;
  84.   std::cout << std::boolalpha << x->Say() << std::endl;
  85.  
  86.   auto y = factory->Create("B");
  87.   std::cout << y->Name() << std::endl;
  88.   std::cout << std::boolalpha << y->Say() << std::endl;
  89. }
  90.  
Success #stdin #stdout 0s 4376KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
A
Baw 123
true
B
Maw b
true
https://ideone.com/uUbAfy
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!