Re: does GNUstep support exception as well as apple implementation?

[Dr. H. Nikolaus Schaller]

Hi David,

Am 04.06.2010 um 15:30 schrieb David Chisnall:

> On 4 Jun 2010, at 12:18, Shuduo Sang wrote:
>
> > Does it mean the exception implementation of GNUstep is not  
> > complete as well as Apple runtime?
>
>
> There are two implementations of exception handling for use with  
> GNUstep.  One is the old NeXT-style implementation, using setjmp()/ 
> longjmp(), which is slow, unsafe, and needs to die a quick and  
> peaceful death.  You may only use this with the NS_DURING family of  
> macros.

Can you explain that a little?

My view is:

Exceptions are exceptions and should never occur in normal operation.  
So it does not matter that they are slow when they got rised (is this  
currect English?). Or you have a fundamental design problem. So, IMHO  
the only "cost" is the setjmp() hidden by the NS_DURING macro which  
AFAIK fills an array with some pointers and values.

And what is specifically unsafe with using them? They have been in use  
for 20 years now.

BR,
Nikolaus