On Apr 29, 2012, at 8:00 PM, Don Quixote de la Mancha wrote:

> Place some assertions as the very first executable lines in each of
> your subroutines.
...
> #include <assert.h>
> 
> void foo( int *ptr )
> {
>   assert( NULL != ptr );

Ouch. Don’t use this in a Cocoa app; use NSAssert and NSParameterAssert 
instead. You’ll get much better reporting of the error, because you can use 
custom messages with parameters, and the app will raise an exception and log 
the backtrace. On Mac OS the system will also put up the standard crash alert, 
whereas a call to abort() (which is what assert() calls) just makes the app 
vanish with no explanation to the user.

—Jens

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