C++ class 和 struct 可以相互繼承嗎

double64發表於2024-07-19

C++ class 和 struct 可以相互繼承嗎?

#include <iostream>
#include <string>

namespace
{
    class A
    {
    public:
        std::string name = "小明";
    };

    struct B :public A
    {
        int age = 12;
    };

    class C :public B
    {
    public:
        std::string gender = "男";
    };

    void showStuCInfo(const C &c)
    {
        std::cout << "姓名:" << c.name << std::endl
            << "性別:" << c.gender << std::endl
            << "年齡:" << c.age << std::endl;
    }
}

int main()
{
    C stu;
    showStuCInfo(stu);

    C* xiaoMing_c = &stu;
    B* xiaoMing_b = xiaoMing_c;
    A* xiaoMing_a1 = xiaoMing_b;
    A* xiaoMing_a2 = xiaoMing_c;

    std::cout << std::endl;
    showStuCInfo(*xiaoMing_c);

    std::cout << std::endl;
    std::cout << "姓名:" << xiaoMing_b->name << std::endl
        << "年齡:" << xiaoMing_b->age << std::endl;

    std::cout << std::endl;
    std::cout << "姓名:" << xiaoMing_a1->name << std::endl;

    std::cout << std::endl;
    std::cout << "姓名:" << xiaoMing_a2->name << std::endl;

    return 0;
}

輸出:

姓名:小明
性別:男
年齡:12

姓名:小明
性別:男
年齡:12

姓名:小明
年齡:12

姓名:小明

姓名:小明

可以看出,他們兩個之間沒有生殖隔離,可以相互繼承。唯一區別,一個是預設 public,一個是預設private

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