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  1. #include <iostream>
  2. #include <string>
  3.  
  4.  
  5. struct ex1
  6. {
  7.     std::string reason;
  8.     ex1(std::string reason_): reason(reason_) {};
  9.     virtual std::string what()
  10.     {
  11.         return reason;
  12.     }
  13. };
  14.  
  15. struct ex2 : ex1
  16. {
  17.     std::string comment;
  18.     ex2(std::string reason_, std::string comment_) : ex1(reason_), comment(comment_) {}
  19.     virtual std::string what()
  20.     {
  21.         return reason + " " + comment;
  22.     }
  23. };
  24.  
  25. int main()
  26. {
  27.     try {
  28.         throw ex2("Hello", "there");
  29.     } catch (ex1 e) {
  30.         std::cout << e.what() << '\n';
  31.     }
  32.     try {
  33.         throw ex2("Hello", "there");
  34.     } catch (ex1& e) {
  35.         std::cout << e.what();
  36.     }
  37. }
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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Hello
Hello there
https://ideone.com/iu8BHh
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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