QT undefined reference to `vtable for "xxx"'
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QT编译时遇到问题
undefined reference to `vtable for “XXX"'
找了很多办法，改虚函数、改基类函数实现等等.....
后来发现注掉Q_OBJECT，错误就不再提示。如果没有语法错误，且不论在QtCreator中怎么清理项目，错误仍存在，那么可能的原因应该是在程序输出目录中由qmake生成的makefile文件里不存在编译Q_OBJECT的信息，因此信号/槽机制失效。而在该类加上Q_OBJECT后，QtCreator没有自动执行qmake来更新makefile文件，这时就会在link时有上述错误。
解决方法：删除程序的输出目录build-XXX-XXX-release或者debug,重新构建项目就行了，运行，就可以了。
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