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var counter = 0;  // 引用计数器
class BaseClass {
    init() {
        counter=counter+1
    }
    deinit {
        counter=counter-1
    }
}
 
var show: BaseClass? = BaseClass()
 
 
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Snippet Metadata
Owner	w3xue
Created	3 years ago
Modified	3 years ago
Visibility	Public