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  1. #include <iostream>
  2.  
  3. #include <string>
  4.  
  5. #include <type_traits>
  6.  
  7.  
  8.  
  9. struct B { B() {} B(int) {} };
  10.  
  11. struct C {};
  12.  
  13.  
  14.  
  15. struct A : B, C
  16.  
  17. {
  18.  
  19. public:
  20.  
  21.     template <
  22.  
  23.         class T,
  24.  
  25.         class =
  26.  
  27.             typename std::enable_if<
  28.  
  29.                 std::is_convertible<T, B>::value, T>::type> 
  30.  
  31.     A(T&& t)
  32.  
  33.     {
  34.  
  35.         std::cout << "A(T&&)\n";
  36.  
  37.     }
  38.  
  39.  
  40.  
  41.     template <class... TArgs>
  42.  
  43.     A(TArgs&&... targs)
  44.  
  45.     {
  46.  
  47.         std::cout << "A(TArgs&&)\n";
  48.  
  49.     }
  50.  
  51. };
  52.  
  53.  
  54.  
  55. int main()
  56.  
  57. {
  58.  
  59.     B b;
  60.  
  61.  
  62.  
  63.     A a1(b);
  64.  
  65.     A a2(4);
  66.  
  67.     A a3("hello");
  68.  
  69.  
  70.  
  71.     return 0;
  72.  
  73. }
  74.  
  75.  
  76.  
  77.  
Success #stdin #stdout 0s 2852KB
comments (?)
stdin 
Standard input is empty
stdout 
A(T&&)
A(T&&)
A(TArgs&&)
https://ideone.com/xJEjic
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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