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  1. #include <exception>
  2. #include <iostream>
  3. #include <stdexcept>
  4.  
  5. template<typename E>
  6. void rethrow_unwrapped(const E& e)
  7. {
  8.     try {
  9.         std::rethrow_if_nested(e);
  10.     } catch(const std::nested_exception& e) {
  11.         rethrow_unwrapped(e);
  12.     } catch(...) {
  13.         throw;
  14.     }
  15. }
  16.  
  17. void foo();
  18.  
  19. int main()
  20. {
  21.     try {
  22.         foo();
  23.     } catch(const std::exception& e) {
  24.         try {
  25.             rethrow_unwrapped(e);
  26.         } catch (const std::logic_error& e) {
  27.             std::cout << "success! unwrapped to logic_error" << std::endl;
  28.         }
  29.     }
  30.  
  31.     return 0;
  32. }
  33.  
  34. void never_called()
  35. {
  36.     throw std::logic_error("never_called() was called");
  37. }
  38.  
  39. void throws_with_nested()
  40. {
  41.     try {
  42.         never_called();
  43.     } catch (...) {
  44.         std::throw_with_nested( std::runtime_error("something broke") );
  45.     }
  46. }
  47.  
  48. void foo()
  49. {
  50.     try {
  51.         throws_with_nested();
  52.     } catch (...) {
  53.         std::throw_with_nested( std::runtime_error("oops") );
  54.     }
  55. }
Success #stdin #stdout 0s 3476KB
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stdin
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Standard input is empty
stdout
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success! unwrapped to logic_error
https://ideone.com/peUiKs
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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