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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. struct interface {
  5. 	virtual int hello() = 0;
  6. };
  7.  
  8. struct implementation : public interface {
  9. 	virtual int hello() {
  10. 		std::cout << "hello()\n";
  11. 		return 42;
  12. 	}
  13. 	~implementation() {
  14. 		std::cout << "~implementation()\n";
  15. 	}
  16. };
  17.  
  18. struct adapter {
  19. 	interface* obj;
  20.  
  21. 	adapter(std::function<int()>&& func) {
  22. 		struct lambda : public interface {
  23. 			std::function<int()> func;
  24. 			lambda(std::function<int()> func_): func(func_) { }
  25. 			virtual int hello() {
  26. 				return this->func();
  27. 			}
  28. 		};
  29. 		this->obj = new lambda{func};
  30. 	}
  31.  
  32. 	adapter(interface&& impl) {
  33. 		this->obj = &impl;
  34. 	}
  35. };
  36.  
  37. int main() {
  38. 	adapter a([]() { std::cout << "hello from lambda\n"; return 99; });
  39. 	a.obj->hello();
  40.  
  41. 	adapter b{implementation()};
  42. 	b.obj->hello();
  43.  
  44. 	return 0;
  45. }
Success #stdin #stdout 0s 3456KB
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Standard input is empty
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hello from lambda
~implementation()
hello()
https://ideone.com/Gz3ICk
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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