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  1. #include <iostream>
  2. #include <functional>
  3. #include <string>
  4.  
  5. struct TestA
  6. {
  7.     std::string s;
  8.     TestA(){}
  9.     TestA(std::string const&s) : s(s) {}
  10.     TestA(TestA const&) = default;
  11.     TestA(TestA &&) = default;
  12.     TestA &operator=(TestA const&) = default;
  13.     TestA &operator=(TestA &&) = default;
  14.     ~TestA() = default;
  15. };
  16.  
  17. template<typename T, typename... Args>
  18. std::function<T &&(Args...)> WrapCtor()
  19. {
  20.     return [](Args... args) -> T &&
  21.     {
  22.         return T(args...);
  23.     };
  24. }
  25.  
  26. int main()
  27. {
  28.     auto f = WrapCtor<TestA, std::string const&>();
  29.     TestA inst = f("test");
  30.     std::cout << inst.s << std::endl;
  31. }
  32.  
Runtime error #stdin #stdout 0s 4052KB
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Standard input is empty
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language:

						
C++14 (gcc 8.3)

					

					

						
created:
								
						
11 years ago

					

					

						
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