我有以下场景:
class num {
public:
void print(ostream* o); // Prints the n variable
};
class int_num : public num{
public:
int n; // Initialized by this class's constructor
};
class float_num : public num{
public:
float n; // Initialized by this class's constructor
};
class double_num : public num{
public:
double n; // Initialized by this class's constructor
};
我如何实现这样的方案
最佳答案
给它一个虚方法,在派生类型中实现:
class num {
public:
void print(ostream& o) const
{ // Prints the n variable
doPrint(o);
}
private:
virtual void doPrint(ostream& os) const = 0;
};
class double_num : public num{
public:
double n; // Initialized by this class's constructor
private:
void doPrint(ostream& os) const
{
os << n;
}
};
关于c++ - 访问派生类成员的基类方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14463179/