vs项目编译到xcode上报的错

1.vtable for XXX:  referenced form :a missing vtable usually means the first non-inline virtual member function has no definition

Linked command failed with exit code 

原因：1.在xcode下编译cocos2d-x项目，如果子类继承了父类但是没有实现父类的虚函数，就会报如上错误。同时，没有实现析构函数也会出现同样问题。