On 21 Feb 2006, at 19:18, Derek Zhou wrote:
"Andrew Ruder" <[EMAIL PROTECTED]> writes:
2. make the ivar/setter generic somehow ... eg by using a void*
rather than an int. Actually a windows handle is an unsigned long
thought I'm not sure it's guaranteed to stay that way ... using
void*
in the generic part should be safe though.
The worst thing about the void * is that the number of warnings
generated on a amd64 machine is pretty staggering on NSStream. I've
included a sample output below. Can't this be done with typedef's?
- Andy
I don't have a 64bit machine so I cannot verify, but In
Foundation/NSRunloop.h there is:
- (void) addEvent: (void*)data
type: (RunLoopEventType)type
watcher: (id<RunLoopEvents>)watcher
forMode: (NSString*)mode;
Where data is the file descriptor (int) in Unix. So how does that
work?
You call it as [loop addEvent (void*)(intptr_t)desc type: type
watcher: watcher forMode: mode]
The double cast tells the compiler how to pass it and not to generate
a warning.
The (intptr_t) tells it to extend an integer value to the size of a
pointer.
The (void*) tells it that it is OK to treat the value as an abstract
pointer.
PS. I made sure the code in svn does not generate warnings.
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