C语言中如何将一个虚函数改写成长尾？

本文共计526个文字，预计阅读时间需要3分钟。

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形式：virtual 函数类型 函数名 （）（在派生类和基类里都要写）

静态成员函数不能是虚函数

1.通过指针实现多态

对于基类的对象：调用基类的虚函数

对于派生类的对象：调用派生类的虚函数

#include <iostream> using namespace std; class A { public: virtual void Print() { cout << "print A" << endl; } }; class B: public A { public: virtual void Print() { cout << "print B" << endl; } }; class C: public A { public: virtual void Print() { cout << "print C" << endl; } }; int main() { A a1; A a2; B b; C c; A *pa1 = &a1; A *pa2 = &a2; C *pc = &c; pa1->Print(); pa1 = &b; pa1->Print(); pa2 = pc; pa2->Print(); return 0; }

2.通过基类的引用实现多态

#include <iostream> using namespace std; class A { public: virtual void Print() { cout << "print A" << endl; } }; class B: public A { public: virtual void Print() { cout << "print B" << endl; } }; void in(A &r)//基类的引用 { r.Print();//是谁的对象就调用谁的Print } int main() { A a; B b; in(a); in(b); return 0; }