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  1. #include <iostream>
  2. #include <sstream>
  3.  
  4. template <class exception, class charT, class traits>
  5. std::basic_ostream<charT,traits>& throw_cpp(std::basic_ostream<charT,traits>& os)
  6. {
  7.     std::stringstream& self = dynamic_cast<std::stringstream&>(os); //maybe throws std::bad_cast
  8.     throw exception(self.str());
  9.     return os; //redundant, but the compiler might not know that.
  10. }
  11.  
  12. #include <stdexcept>
  13. #include <fstream>
  14. int main() {
  15.     try {
  16.         int world = 42;
  17.         std::stringstream() << "HELLO " << world << throw_cpp<std::logic_error>;
  18.     } catch(const std::logic_error& e) {
  19.         std::cerr << e.what() << '\n'; 
  20.     }
  21.     try {
  22.         std::fstream() << "HELLO " << throw_cpp<std::logic_error>;
  23.     } catch(const std::exception& e) {
  24.         std::cerr << e.what() << '\n'; 
  25.     }
  26. }
Success #stdin #stdout #stderr 0s 3028KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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HELLO 42
std::bad_cast
https://ideone.com/F9eutl
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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