What means a word "USING" in declaration of @protocol
?
The declaration is:
@protocol name
USING
// declaration of methods
@end
There's no using
keyword in Objective-C.
Two possibilities:
It's somewhere defined as a macro, in that case you have to look it up in your code. (Xcode helps you with this if you click on it using a right-click.)
The file is actually Objective-C++. The using
keyword comes from C++, but I don't think there's a special functionality in the context of @protocol
.
Given the fact that it's written in capitals, I'd say it's a macro.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.