C++虚基类（天大901）

最新推荐文章于 2022-10-28 20:09:08 发布

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最新推荐文章于 2022-10-28 20:09:08 发布

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分类专栏： ACM_编程基石C/C++ ACM_C++系列

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本文通过几个示例展示了C++中虚函数与多态的使用方式，包括如何通过基类指针调用派生类的方法实现运行时多态，并演示了不同类型参数的虚函数重载。

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#include <iostream>
using namespace std;
class Base{
    public:
        virtual Base* afn() {
            cout << "This is Base class.\n";
            return this;
        }
};

class SubClass: public Base {
public:
    SubClass* afn() {
        cout << "This is SubClass.\n" ;
        return this;
    }
};

void test(Base &x) {
    Base* b;
    b = x.afn();
}

int main()
{
    Base bc;
    SubClass sc;
    cout << "Calling test(bc)\n";
    test(bc);
    cout << "Calling test(sc)\n";
    test(sc);
    return 0;
}

class Base{
    public:
        virtual void fn(int x){
            cout << "In Base class, int x = " << x << endl;
        }
};

class SubClass: public Base {
public:
    virtual void fn(float x) {
        cout << "In SubClass, float x = " << x << endl;
    }
};

void test(Base &b) {
   int i = 1;
   b.fn(i);
   float f = 2.0;
   b.fn(f);
}

int main()
{
    Base bc;
    SubClass sc;
    cout << "Calling test(bc)\n";
    test(bc);
    cout << "Calling test(sc)\n";
    test(sc);
    return 0;
}

class Base{
    public:
        virtual void fn();
};

 void Base::fn() {
    cout << " In Base class\n";
}
class SubClass: public Base {
public:
    virtual void fn();
};
 void SubClass::fn() {
    cout << " In SubClass\n";
}
void test(Base &b) {
    b.fn();
}

int main()
{
    Base bc;
    SubClass sc;
    cout << "Calling test(bc)\n";
    test(bc);
    cout << "Calling test(sc)\n";
    test(sc);
    return 0;
}