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objc/黑箱中的 retain 和 release.md
@@ -52,7 +52,7 @@ id objc_object::rootRetain() {
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`extra_rc` 就是用于保存自动引用计数的标志位,下面就是 `isa` 结构体中的结构:
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接下来我们会分三种情况对 `rootRetain` 进行分析。
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