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  1. #include <string>
  2.  
  3. class C
  4. {
  5.     std::string p_String = "";
  6.     bool p_Bool = false;
  7.     int p_Int = 0;
  8. public:
  9.     template <typename T>
  10.     operator T() const
  11.     {
  12.         if constexpr (std::is_same<T, bool>::value)
  13.             return p_Bool;
  14.         if constexpr (std::is_same<T, std::string>::value)
  15.             return p_String;
  16.         if constexpr (std::is_same<T, int>::value)
  17.             return p_Int;
  18.     }
  19. };
  20.  
  21. int main()
  22. {
  23.     C instance;
  24.     bool b = static_cast<bool>(instance);
  25.     int i = static_cast<int>(instance);
  26.     std::string s = static_cast<std::string const&>(instance);
  27.     //std::string s = static_cast<std::string>(instance);
  28. }
  29.  
Success #stdin #stdout 0s 5008KB
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https://ideone.com/koqMfm
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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