链接错误不能声明抽象方法的抽象基类？
Linker error from not declaring abstract method in abstract base class?
很抱歉，您所访问的页面不存在或链接错误！
你必须在同一个程序中定义所有此类成员，否则会产生一个链接错误。
If you declare a static data member within a class definition as dllexport , a definition must occur somewhere within the same program (as with nonclass external linkage).
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