c++ exceptions, can what() be NULL? -

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Can any time () be taped in the std :: exception?

Is E.Vot () being checked downwards? 

  // ...} hold (const std :: exception & e) {std :: string error; If (E. (he ()) error = e.what (); }   
 
 
 The content of the string is defined as executing, so I think the answer is yes.  
  Edit:  Not so standard says:  
  virtual const char * what () const throw (); 5 Returns: An implementation-defined NTBS  
 
 so it must return the string, not just an indicator and a string  NULL . As others have pointed out that getting an exception is easy, whose  returns  back  NULL , but I'm not sure these things should be in line with standards . Of course, if you are implementing () in your own exception class, then I will consider it very bad behavior that it will allow it to return. 
 
  More:  
 
 Another question is whether the  what ()  faucet, and such exciting issues back Please, please see

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