纯虚函数与抽象类 — 计算机选择题
题目
阅读以下声明，哪一个类不是抽象类？
class Base {
public:
virtual void f() const = 0;
virtual void g(int) = 0;
};
class Mid : public Base {
public:
void f() const override {}
};
class Leaf : public Mid {
public:
void g(int) override {}
};
class Wrong : public Mid {
public:
void g(long) {}
};
A. Base B. Mid C. Leaf D. Wrong