How can I abstract out a repeating try catch pattern in C++

Question

I have a pattern that repeats for several member functions that looks like this:

int myClass::abstract_one(int sig1)
{
  try {
    return _original->abstr         


        

Answer 1

I asked a very similar conceptual question, see Is re-throwing an exception legal in a nested 'try'?.

Basically, you can move the various exception handlers to a separate function by catching all exceptions, calling the handler and rethrowing the active exception.

void handle() {
 try {
  throw;
 } catch (std::exception& err) {
   handleException(err);
 } catch (MyException& err) {
   handleMyException(err);
 } catch (...) {
   handleException();
 }
}

try {
   return _original->abstract_two(sig2);
} catch (...) {
   handle();
}

It scales well with more different exception kinds to differenciate. You can pack the first try .. catch(...) into macros if you like to:

BEGIN_CATCH_HANDLER
return _original->abstract_two(sig2);
END_CATCH_HANDLER