NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
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NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
这句话的意思是:
第一个非内联虚函数(方法)成员没有定义(实现)。
即:虚函数没有被实现。
那么什么是“虚函数”呢?
参考:问题十五:C++中抽象类,虚函数是什么鬼?怎么测试
简单来说,“虚函数”是父类声明的子类必须实现的函数。
一个类中,这种需要实现的“虚函数”可能有好几个。
在编译时(具体说应该是在链接时),当遇到类的第一个虚函数没有被实现,就会报这个错误。
解决方式:
首先,查看父类中定义的所有虚函数有哪些;
然后,在子类中实现所有这些虚函数(最简单的实现方式是将其全部实现为“空函数”,确保能编译成功)。
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