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  1. #include <cstdio>
  2. #include <memory>
  3.  
  4. template <typename T>
  5. struct allocator{
  6.     template<typename... Args>
  7.     auto operator()(Args&&... args) const { 
  8. 	    return std::make_unique<T>(std::forward<Args>(args)...);
  9.     }
  10. };
  11.  
  12. template <typename T, typename A = allocator<T>>
  13. auto get(A a=A{}) {
  14. 	return [a](auto... args){ 
  15. 		return a(args...); 
  16. 	};
  17. };
  18.  
  19.  
  20. int main() {
  21.   auto up0 = get<int>()(); 
  22.   auto up1 = get<int>()(1); 
  23.   auto up0b = get<int>(allocator<int>())();
  24.   auto up1b = get<int>(allocator<int>())(1);
  25.   auto up0c = get<int>([](auto ... args){ return std::make_unique<int>(args...); })();
  26.   auto up1c = get<int>([](auto ... args){ return std::make_unique<int>(args...); })(1);
  27.  
  28.   printf("%d\n", *up0);
  29.   printf("%d\n", *up0b);
  30.   printf("%d\n", *up0c);
  31.   printf("%d\n", *up1);
  32.   printf("%d\n", *up1b);
  33.   printf("%d\n", *up1c);
  34. }
Success #stdin #stdout 0s 3460KB
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https://ideone.com/L0NNuk
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language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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