> The forward declaration is used to tell the compiler: "The word MyClass > represents a class. I don't give you the implementation yet, but it > represents a class, and the implementation will be provided later".
…and this allows you to create a property for an instance of that class in the .h that has the @class forward declaration. This way, you don't need to put #import class.h in there. You will need to include that last line in the .m in order for the property to work. So, in essence, you are putting your #import statement in the implementation and use the @class in the interface in order to reference its iVars in the .h This is all done for performance reasons Op Mar 21, 2013, om 10:20 PM heeft Jean Suisse <jean.li...@gmail.com> het volgende geschreven: > A few minutes search gave me this. While I haven't taken a deep look to these > resources, they do look good. > > - What's a forward declaration ? (several languages including Obj-C) > http://en.wikipedia.org/wiki/Forward_declaration > > - When to use a forward declaration (C++): > http://stackoverflow.com/questions/553682/when-to-use-forward-declaration > > - Objective C Programming Tutorial | Using @class And #import Directives > http://www.youtube.com/watch?v=0b9Qok2uHhU > > @class allows you to declare a class. > Example: @class MyClass; > > The forward declaration is used to tell the compiler: "The word MyClass > represents a class. I don't give you the implementation yet, but it > represents a class, and the implementation will be provided later". > > Jean > > On 21 mars 2013, at 21:43, H Miersch <hmier...@me.com> wrote: > >> hi. >> >> what exactly does @class do? >> >> and what does "forward declaration" mean? >> _______________________________________________ >> >> 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: >> https://lists.apple.com/mailman/options/cocoa-dev/jean.lists%40gmail.com >> >> This email sent to jean.li...@gmail.com > > _______________________________________________ > > 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: > https://lists.apple.com/mailman/options/cocoa-dev/diederik%40tenhorses.com > > This email sent to diede...@tenhorses.com > _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
