c++11 新特性 override 检查函数不可以被重写

1.概要

c++11 新特性 override 检查函数不可以被重写

2.代码

#include <iostream>

using namespace std;

namespace T1 {
    class A
    {
    public:
        virtual void fun() {
            cout << "a fun \n";
        }
    };
    class A1 :A
    {
    public:
        void fun() override {
            cout << "a1 fun \n";
        }
    };
    
    void test() {
        cout << "test1-----------------------\n";
        A* a = (A*)new A1();
        a->fun();
    }
}
namespace T2 {
    class A
    {
    public:
        void fun() {
            cout << "a fun \n";
        }
    };
    class A1 :A
    {
    public:
        /* override: It is not a virtual function that cannot be overwritten
        void fun() override {
            cout << "a1 fun \n";
        }
        */
    };

    void test() {
        cout << "test1----------override: It is not a virtual function that cannot be overwritten-------------\n";
        A* a = (A*)new A1();
        a->fun();
    }
}

int main()
{
    T1::test();
    T2::test();
    std::cout << "Hello World!\n";
}

2.运行结果

test1-----------------------
a1 fun
test1----------override: It is not a virtual function that cannot be overwritten-------------
a fun
Hello World!