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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. class Animal {
  5. public:
  6.     virtual ~Animal() = default;
  7.     virtual const char *says() const = 0;
  8.  
  9.     static std::unique_ptr<Animal> makeLion()
  10.     {
  11.         class Lion : public Animal
  12.         {
  13.         public:
  14.             virtual const char *says() const override
  15.             {
  16.                 return "roar";
  17.             }
  18.         };
  19.         return std::make_unique<Lion>();
  20.     }
  21.     static std::unique_ptr<Animal> makeTiger() {
  22.         class Tiger : public Animal
  23.         {
  24.         public:
  25.             virtual const char *says() const override
  26.             {
  27.                 return "meow";
  28.             }
  29.         };
  30.         return std::make_unique<Tiger>();
  31.     }
  32.     static std::unique_ptr<Animal> makePig() {
  33.         class Pig : public Animal
  34.         {
  35.         public:
  36.             virtual const char *says() const override
  37.             {
  38.                 return "That\'s all Folks!";
  39.             }
  40.         };
  41.         return std::make_unique<Pig>();
  42.     }
  43. };
  44.  
  45. int main() {    
  46.     std::cout << Animal::makeLion()->says() << std::endl;
  47. }
  48.  
Success #stdin #stdout 0s 3468KB
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Standard input is empty
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roar
https://ideone.com/ETkSyL
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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