C++ 对“类的 vtable”构造函数的未定义引用
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undefined reference to 'vtable for class' constructor
提问by Tarounen
I am getting an undefined reference to `vtable for student' while compiling the following header file:
在编译以下头文件时，我收到了对“vtable for student”的未定义引用：
student.h
学生.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(){}
I can't find what is wrong in this.
我找不到这有什么问题。
回答by
You're declaring a virtualfunction and not defining it:
您正在声明一个virtual函数而不是定义它：
virtual void calculateCredits();
virtual void calculateCredits();
Either define it or declare it as:
将其定义或声明为：
virtual void calculateCredits() = 0;
virtual void calculateCredits() = 0;
Or simply:
或者干脆：
virtual void calculateCredits() { };
virtual void calculateCredits() { };
Read more about vftable: http://en.wikipedia.org/wiki/Virtual_method_table
阅读有关 vftable 的更多信息：http: //en.wikipedia.org/wiki/Virtual_method_table
