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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. struct A { };
  5. struct B { };
  6.  
  7. struct C {
  8.     template <typename U,
  9.               typename std::enable_if<std::is_integral<U>::value>::type* = nullptr>
  10.     explicit operator U() const {
  11.         return 1;
  12.     }
  13.  
  14.     template<typename U,
  15. 	 typename std::enable_if<std::is_same<U, A>::value>::type* = nullptr>
  16.     explicit operator U() const {
  17.         return A{ };
  18.     }
  19.  
  20.      template<typename U,
  21. 	 typename std::enable_if<std::is_same<U, B>::value>::type* = nullptr>
  22.     explicit operator U() const {
  23.         return B{ };
  24.     }
  25.  
  26. };
  27.  
  28. int main() {
  29.     C c;
  30.     long y = static_cast<int>(c);
  31.     B b = static_cast<B>(c);
  32.     A a = static_cast<A>(c);
  33. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/smfPwF
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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