C/C++编程：子类和父类相互调用函数

爱被打了一巴掌 2022-09-06 11:29 253阅读 0赞

# 子类调用父类 #

*  可以强制转换也可以不强制转换
 *  如果有同名函数，就要使用类名强制指出到底调用哪一个函数

#include<iostream>
    
    
    class acl_event{
        
    public:
        virtual void acl_event_enable_read(){
        
            printf("acl_event::acl_event_enable_read\n");
        }
    
        void acl_event_enable_read_nonvir(){
        
            printf("acl_event::acl_event_enable_read_nonvir\n");
        };
    };
    
    class acl_event_select : public acl_event{
        
    public:
        void acl_event_enable_read(){
        
            this->acl_event_enable_read_nonvir();
            this->acl_event::acl_event_enable_read();
            this->acl_event::acl_event_enable_read_nonvir();
    
    
            acl_event *event = (acl_event *) this;
            event->acl_event_enable_read_nonvir();
            event->acl_event::acl_event_enable_read_nonvir();
            event->acl_event::acl_event_enable_read();
            printf("acl_event_select::acl_event_enable_read\n");
        }
    };
    
    
    int main(int argc,char **argv){
        
        acl_event_select eventSelect;
        eventSelect.acl_event_enable_read();
        return 0;
    }

![在这里插入图片描述][a2a21a30f53e4fa6aa5a8790d1d5351b.png]

# 父类调用子类 #

*  方法是：父类中定义接口，子类实现这个函数，具体可以参见[设计模式：模板方法模式(template method)—将具体处理交给子类][template method]

#include<iostream>
    
    class acl_event{
        
    public:
        void acl_event_enable_read(){
        
            printf("acl_event::acl_event_enable_read\n");
            event_enable_read();
        }
    
    private:
        virtual void event_enable_read() = 0;
    
    };
    
    class acl_event_select : public acl_event{
        
    private:
        void event_enable_read() override{
        
            printf("event_enable_read::event_enable_read\n");
        }
    };
    class acl_event_poll : public acl_event{
        
    private:
        void event_enable_read() override{
        
            printf("acl_event_poll::event_enable_read\n");
        }
    };
    
    int main(int argc,char **argv){
        
        acl_event * select = new acl_event_select;
        select->acl_event_enable_read();
        delete select;
    
        select = new acl_event_poll;
        select->acl_event_enable_read();
        delete select;
        return 0;
    }

[a2a21a30f53e4fa6aa5a8790d1d5351b.png]: /images/20220829/39c3452e98e84126b3c522220ebf0683.png
[template method]: https://blog.csdn.net/zhizhengguan/article/details/119731371