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Bu duruma ne denir?",[162,164,166,168],{"key":133,"text":163},"Bir weak referans zinciri",{"key":136,"text":165},"Bir retain cycle (güçlü referans döngüsü)",{"key":139,"text":167},"Sarkan bir pointer (dangling pointer)",{"key":142,"text":169},"Bir copy-on-write ihlali","İki nesne dışarıdan hiçbir referans olmadan birbirini güçlü tuttuğunda, ikisinin de sayısı asla sıfıra ulaşmaz, bu yüzden ARC onları asla dealloc edemez — bu bir retain (güçlü referans) döngüsüdür, bir bellek sızıntısı biçimidir.",{"id":172,"topic":9,"difficulty":129,"body":173,"options":174,"correct_key":142,"explanation":183},"019f956d-6def-7007-8138-80b1cb231d97","Bir property'yi `weak var delegate: SomeDelegate?` olarak tanımlamak, referans edilen nesnenin ARC referans sayısına ne yapar?",[175,177,179,181],{"key":133,"text":176},"Normal bir referans gibi güçlü referans sayısını tam olarak bir artırır",{"key":136,"text":178},"Referans sayısını kalıcı olarak hemen sıfıra ayarlar",{"key":139,"text":180},"Güvenlik için referans sayısını ikiye katlar",{"key":142,"text":182},"Güçlü referans sayısını hiç artırmaz","Bir `weak` referans güçlü referans sayısına katkıda bulunmaz, bu yüzden bir nesneyi yalnızca `weak` ile tutmak onu canlı tutmaz.",{"id":185,"topic":9,"difficulty":186,"body":187,"options":188,"correct_key":142,"explanation":197},"019f956d-6def-78d6-8d92-9e8818fd9ec9",2,"İşaret ettiği nesne dealloc edildiğinde bir `weak` referansın değerine ne olur?",[189,191,193,195],{"key":133,"text":190},"Serbest bırakılan bellek konumunu değişmeden göstermeye devam eder",{"key":136,"text":192},"Dealloc olduğu anda uygulamayı çökertir",{"key":139,"text":194},"Bunu önlemek için sessizce güçlü bir referansa dönüştürülür",{"key":142,"text":196},"Otomatik olarak `nil` olur","Weak referanslar, referans edilen nesne dealloc edildiğinde runtime tarafından otomatik olarak `nil`'e ayarlanır; weak referansların optional olarak bildirilmesi gerekmesinin tam nedeni budur.",{"id":199,"topic":9,"difficulty":186,"body":200,"options":201,"correct_key":136,"explanation":210},"019f956d-6df0-71db-b6d7-8d03b95441ef","Bir `weak var` property'sinin neden her zaman bir Optional tip olarak bildirilmesi gerekir (ör. `weak var x: Foo?`, asla `weak var x: Foo` değil)?",[202,204,206,208],{"key":133,"text":203},"Çünkü Optional tipler optional-olmayan class referanslarından daha az bellek kullanır",{"key":136,"text":205},"Çünkü referans, referans edilen nesne dealloc edildiğinde herhangi bir anda `nil` olabilir",{"key":139,"text":207},"Çünkü Swift derleyicisi tüm weak anahtar kelimelerinin bir enum tipinden önce gelmesini gerektirir",{"key":142,"text":209},"Çünkü optional-olmayan weak referanslar bildirimde her zaman çökerdi","Bir weak referans, ömrü boyunca herhangi bir anda otomatik olarak nil'e ayarlanabildiğinden, tip sistemi nil'in temsil edilebilir, geçerli bir değer olması için onun Optional olmasını 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