ezura

// objc
@interface ObjcClass<T> : NSObject
@property(nonnull) T property;
@end

// swift
protocol ContainGenericType {
    associatedtype T
    var property: T { get }
}

ezura

class Obj2 {
    var tag: String
    init(_ tag: String) {
        self.tag = tag
    }
    
    func defer1() {
        print(tag, #function, "start", CFGetRetainCount(self))
        defer { print(tag, #function, "defer", CFGetRetainCount(self)) }
        print(tag, #function, "end", CFGetRetainCount(self))

ezura

    do {
        let obj2 = NSObject()
        CFGetRetainCount(obj2)  // 2
        let test = { CFGetRetainCount(obj2) }
        CFGetRetainCount(obj2)  // 3
        test()                  // 4
        CFGetRetainCount(obj2)  // 3
    }