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  1. #include <iostream>
  2.  
  3.     // test stubs:
  4.     template<typename... Ts>
  5.     using UPtr = int;
  6.     template<typename... Ts>
  7.     using SPtr = double;
  8.  
  9.     template<typename T, typename...TA>
  10.     UPtr<T,TA...> makeUniquePtr() {
  11.     	std::cout << "makeUniquePtr\n";
  12.     	return {};
  13.     }
  14.     template<typename T, typename...TA>
  15.     SPtr<T,TA...> makeSharedPtr() {
  16.     	std::cout << "makeSharedPtr\n";
  17.     	return {};
  18.     }
  19.  
  20.     struct unique_ptr_maker {
  21.       template<typename T, typename...TA, typename...Args>
  22.       static UPtr<T, TA...> make(Args&&...args) {
  23.         return makeUniquePtr<T, TA...>( std::forward<Args>(args)... );
  24.       }
  25.     };
  26.     struct shared_ptr_maker {
  27.       template<typename T, typename...TA, typename...Args>
  28.       static SPtr<T, TA...> make(Args&&...args) {
  29.         return makeSharedPtr<T, TA...>( std::forward<Args>(args)... );
  30.       }
  31.     };
  32.  
  33. template<typename maker, class T, class... TA> void func() {
  34. 	std::cout << "func\n";
  35. 	maker::template make<T, TA...>();
  36. }
  37.  
  38. template<class T, class... TA> void implementation1()
  39. {
  40. 	func<unique_ptr_maker, T, TA...>();
  41. }
  42. template<class T, class... TA> void implementation2()
  43. {
  44. 	func<shared_ptr_maker, T, TA...>();
  45. }
  46. int main() {
  47. 	implementation1<int, double>();
  48. 	implementation2<int, char>();
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 3296KB
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Standard input is empty
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func
makeUniquePtr
func
makeSharedPtr
https://ideone.com/CMmHlX
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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