使用CArray碰到error C2248: 'CObject::operator =' : cannot access private member declared in class 'CObject'

http://www.cppblog.com/hlong/archive/2007/11/20/37015.html
問題大概像是文章內所述,
照他的寫法也可以compile過,
不過看不太懂為什麼要這樣改?