C series of the derived class how to write copy for the reference counting semantics of small programs oh

Packet : 432594如何为派生类提供写时拷贝语义的引用计数.rar filelist
实例18  如何为派生类提供写时拷贝语义的引用计数\18.cpp
实例18  如何为派生类提供写时拷贝语义的引用计数\readme.txt
实例18  如何为派生类提供写时拷贝语义的引用计数

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