在编译以下头文件时,我得到了对'vtable for student'的未定义引用:
student.h
class student
{
private:
string names;
string address;
string type;
protected:
float marks;
int credits;
public:
student();
student(string n,string a,string t,float m);
~student();
string getNames();
string getAddress();
string getType();
float getMarks();
virtual void calculateCredits();
int getCredits();
};
student::student(){}
student::student(string n, string a,string t,float m)
{
names = n;
address = a;
marks = m;
}
student::~student(){}
我找不到这个错误。
答案 0 :(得分:71)
您正在声明virtual
功能而不是定义它:
virtual void calculateCredits();
定义它或将其声明为:
virtual void calculateCredits() = 0;
或者简单地说:
virtual void calculateCredits() { };
详细了解vftable:http://en.wikipedia.org/wiki/Virtual_method_table