Le 12 janv. 09 à 03:29, Graham Cox a écrit :
On 12 Jan 2009, at 1:20 pm, Michael A. Crawford wrote:
I want to force derived classes to implement a given interface
without provided a default implementation. Does the concept exist
in Objective-C (I'm almost sure it does)? If so, what does the
syntax look like?
The nearest thing to pure virtual methods is a formal protocol,
declared using the @protocol directive.
file:///Developer/Documentation/DocSets/com.apple.ADC_Reference_Library.CoreReference.docset/Contents/Resources/Documents/documentation/Cocoa/Conceptual/ObjectiveC/Articles/chapter_7_section_6.html
A class that "conforms to" the formal protocol is required to
implement the methods of the protocol.
Just for the record. Mac OS 10.5 introduced two new keywords to define
methods in a protocol:
@required
@optional.
A class that "conforms to" the formal protocol is required to
implement the methods marked as required of the protocol.
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
