= Cocoa Bridge Tips =

== `nil` ==

In Objective-C, `nil` is a null pointer.  In Lisp, `nil` is...well, let's not get
into it.  Don't mix these up.
Use `+null-ptr+` in Lisp where you would write `nil` in Objective-C.

For example, you would write
{{{
(#/arrayWithObjects: ns:ns-array #@"foo" #@"bar" #@"baz"
                     +null-ptr+) ;don't even think about putting nil here
}}}

== Memory Management ==

The [http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Tasks/MemoryManagementRules.html normal Cocoa memory managment rules] apply to instances
of Objective-C objects created from Lisp.  The Lisp doesn't
automatically release them.

== Class methods ==

A class method such as
{{{
@implementation FooPanel
+ sharedFooPanel
{
    ...
}
@end
}}}
is defined like this:
{{{
(objc:defmethod #/sharedFooPanel ((self +foo-panel))
  ...)
}}}