@class NSMutableArray; @interface GCObjectPool : NSObject { NSMutableArray *objects; struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } lock; } - (id)init; - (void).cxx_destruct; - (BOOL)addObjectWith:(id /* block */)a0; - (id)takeObjectOrCreateWith:(id /* block */)a0; @end