Question

   int somefunction(bool a)
    {
      try
      {
        if(a)
        throw Error("msg");
        return 2;
      }
     catch (Error const & error)
     {
       //do i need to return anything here??
       //return -1;
     }
    }

Answer 1

You need to either return something or re-throw the exception (or throw a new one). You can rethrow the same exception by just using the keyword

throw

in the catch block with no exception or arguments afterwards.