www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - Is there any way I can have one handler for multiple exceptions?

reply Andrej Mitrovic <andrej.mitrovich gmail.com> writes:
I'm trying to do something like the following:

import std.exception;

class Foo : Exception
{
    this(string msg) { super(msg); }
}

class Bar : Exception
{
    this(string msg) { super(msg); }
}

void main()
{
    try
    {
    }
    catch (Foo) catch (Bar)
    {
    }
}

Some function might throw two types of exceptions, but I don't care
which one it is, I'd like to handle them both within one catch block.
Is this possible?

My use case is for the cmdln.interact library, I'm using userInput!()
to get an integer from the user and the function can throw either a
NoInputException or ConvException, but I don't really care which one
it is because if either exception is thrown my next action is to use a
predefined default.

Their base class is Exception, but catching all forms of Exceptions is
a bad idea.
Jul 11 2011
parent reply "Steven Schveighoffer" <schveiguy yahoo.com> writes:
On Mon, 11 Jul 2011 18:08:19 -0400, Andrej Mitrovic  
<andrej.mitrovich gmail.com> wrote:


 I'm trying to do something like the following:

 import std.exception;

 class Foo : Exception
 {
     this(string msg) { super(msg); }
 }

 class Bar : Exception
 {
     this(string msg) { super(msg); }
 }

 void main()
 {
     try
     {
     }
     catch (Foo) catch (Bar)
     {
     }
 }

 Some function might throw two types of exceptions, but I don't care
 which one it is, I'd like to handle them both within one catch block.
 Is this possible?


Call a function?


void main()
{
    void handleEx(Exception e)
    {
       // exception handling code here
    }

    try
    {
    }
    catch(Foo f)
    {
       handleEx(f);
    }
    catch(Bar b)
    {
       handleEx(b);
    }
}

Another option is *shudders* goto.

-Steve
Jul 12 2011
parent Andrej Mitrovic <andrej.mitrovich gmail.com> writes:
On 7/12/11, Steven Schveighoffer <schveiguy yahoo.com> wrote:

 Call a function?
 void main()
 {
     void handleEx(Exception e)
     {
        // exception handling code here
     }

     try
     {
     }
     catch(Foo f)
     {
        handleEx(f);
     }
     catch(Bar b)
     {
        handleEx(b);
     }
 }


Yeah that's what I did finally.


 Another option is *shudders* goto.

 -Steve


Get outta here! :p
Jul 12 2011