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  1. // Test1.cpp: определяет точку входа для консольного приложения.
  2. //
  3. #include <memory>
  4. #include <utility>
  5. #include <functional>
  6.  
  7. template <typename T> 
  8. struct Callable;
  9.  
  10. template <typename R, typename... Args> 
  11. struct Callable <R(Args...)>
  12. {
  13. 	virtual R operator () (Args&&...) {}
  14. };
  15.  
  16. template <typename T> 
  17. class Function;
  18.  
  19. template <typename R, typename... Args> 
  20. class Function<R(Args...)>
  21. {
  22. 	typedef std::unique_ptr <Callable<R(Args...)>> Ptr;
  23. 	Ptr ptr;
  24.  
  25. 	template <typename T>
  26. 	class Realisation : public Callable<R(Args...)>
  27. 	{
  28. 		T t;
  29. 	public :
  30. 		R operator () (Args&&... args)
  31. 		{
  32. 			return t(std::forward<Args>(args)...);
  33. 		}
  34.  
  35. 		Realisation () {}
  36.  
  37. 		Realisation(T&& at) : t(std::move(at)) 
  38. 		{}
  39. 	};
  40.  
  41. public :
  42. 	R operator () (Args&&... args)
  43. 	{
  44. 		return ptr->operator () (std::forward<Args>(args)...);
  45. 	}
  46.  
  47. 	Function () 
  48. 	{}
  49.  
  50. 	template <typename T>
  51. 	Function (T&& t): ptr(std::make_unique<Realisation<T>>(std::move(t)))
  52. 	{}
  53. };
  54.  
  55. int main()
  56. {	
  57. 	Function<void(const char*)> f = [] (const char* a) { printf("%s\n", a); };
  58. 	f("Hello, world!");
  59.  
  60. 	getchar();
  61.     return 0;
  62. }
  63.  
  64.  
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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Hello, world!
https://ideone.com/19jEMM
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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