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User's Guide to the GNU Objective-C Class Library

15.1 Basic Querying

Method: Collection (BOOL) @keyword{-isEmpty}

Returns YES if the receiver contains no members; returns NO otherwise.

Method: Collection (const char *) @keyword{-contentEncoding}

Returns a description of the C type that the receiving collection can hold. The description is a string of the form returned by the Objective-C @encode directive.