Question

In my project codding i have to use a try catch method to find the function execution status.

   try
   {
      //sample code
      //calling functions
      function1();
      function2();
      //........
   }
   catch(//need to catch exception)
   { 
    return failure;
   }

My requirement is that i have to catch all the exceptions that thrown from the try block

i have two options here,

1. catch(…)
2. catch(std::exception)

I think the first one will catch all the exceptions. And the second one, std::exception is the base class for all other exception classes in my program

   class MyException : public std::exception
   {
    // All the exceptions that i have use is derived from this class
   }. 

Which is better and more efficient.

Is the both method works same way. Help me and suggest any method

Answer 1

Always keep your specification as focused as possible so that you catch those that you know could be thrown, and catch derived exceptions (more specialised) before base ones:

try
{
    // Some stuff
}
catch (Derived& e)
{
    // Deal with specifics of Derived
}
catch (Base& e) 
{
    // Deal with general case of Base
}

Never use catch(...) except at the very top of your program stack (and certainly not in libraries.) When you do this, you cannot be sure about what caused the exception and therefore you cannot necessarily rely on things that you normaly would (such as memory management etc.)