我很确定这个问题是重复的,但我的代码在这里有所不同,以下是我的代码.它失败了“未定义的符号”错误,不确定丢失了什么.
class Parent {
public :
virtual int func () = 0;
virtual ~Parent();
};
class Child : public Parent {
public :
int data;
Child (int k) {
data = k;
}
int func() { // virtual function
cout<<"Returning square of 10\n";
return 10*10;
}
void Display () {
cout<<data<<"\n";
}
~ Child() {
cout<<"Overridden Parents Destructor \n";
}
};
int main() {
Child a(10);
a.Display();
}
以下是编译时的O / P.
Undefined symbols for architecture x86_64:
"Parent::~Parent()",referenced from:
Child::~Child() in inher-4b1311.o
"typeinfo for Parent",referenced from:
typeinfo for Child in inher-4b1311.o
"vtable for Parent",referenced from:
Parent::Parent() in inher-4b1311.o
NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
解决方法
未定义Parent ::〜Parent().
您可以将定义直接放入类定义中：
class Parent {
public :
virtual int func () = 0;
virtual ~Parent() {};
};
或者单独定义它.或者,从C 11开始,写入virtual~Parent()= default;.
无论如何,析构函数需要一个定义.
