Selective member import/export is best used for providing a version of the exported class interface that is more restrictive; that is, one for which you can design a DLL that exposes fewer public and private features than the language would otherwise allow. It is also useful for fine-tuning the exportable interface: when you know that the client, by definition, is unable to access some private data, you need not export the entire class.
If you export one virtual function in a class, you must export all of them, or at least provide versions that the client can use directly.
If you have a class in which you are using selective member import/export with virtual functions, the functions must be in the exportable interface or defined inline (visible to the client).
If you define a member as dllexport but do not include it in the class definition, a compiler error is generated. You must define the member in the class header.
Although the definition of class members as dllimport or dllexport is permitted, you cannot override the interface specified in the class definition.
If you define a member function in a place other than the body of the class definition in which you declared it, a warning is generated if the function is defined as dllexport or dllimport (if this definition differs from that specified in the class declaration).
注：本站部分文章源于互联网，版权归原作者所有！如有侵权，请原作者与本站联系，本站将立即删除！ 本站文章除特别注明外均可转载，但需注明出处！ [MinTao学以致用网] 
