Question

我试图使用指向成员函数的指针通过链表进行动态访问。（几个月以来我一直在学习C ++）

A上了一堂课。类的构造函数建立一个链表。每个节点包含一些数据，指向下一个节点的指针以及指向函数的指针a（我正在尝试最后一个……暂时不起作用）

我能够在构造函数中使用指向成员函数的指针，但我不理解如何将此指针值传递给其他结构或函数。也许我想念一些简单的事情...

预先感谢您的帮助。

尝试对成员函数的指针使用正确的语法
尝试一些不同的语法将值作为参数传递给函数

class linkedFct{
private:
    struct node *firstNode;
    struct node *lastNode;
    struct node *newNode;
    struct node *currentNode;
public:
    linkedFct(){
        firstNode = (NULL); 
        lastNode = (NULL);

        void (linkedFct::*ptrFct)();        
        ptrFct = &linkedFct::theFunctionA;  
        //Call the function by pointer... this works!!! Great!
        (this->*ptrFct)();
        //Add a first node to the list          
        addNode("Try a first task");            
        //addNode("Try a first task", &(this->*ptrFct()));
        //Trying to include the member function pointer into the list data
        //this is not working!!! Don't understand how to pass that pointer
        //to a member function
    }

    void addNode(string aName){ 
    //void addNode(string aName, void (linkedFct::*ptrF)()){
            //I am trying to implement something like this
            //Trying to pass a member function pointer thru this attribute
        newNode = new node; 
        newNode->name = aName;
        //newNode->ptrFunction = ptrF;          //Trying to implement something like this***
        lastNode = newNode; 
        if (!firstNode){
            firstNode = newNode;
        }
        else{
            currentNode->nextNode = newNode;
        }
        currentNode = newNode;


};

尝试使用列表中的指针... mmm ...不能正常工作

void processTheList(){                      //Browse the list
    struct node *thisCurrentNode;
    void (linkedFct::*ptrRunFct)();
    thisCurrentNode = firstNode;                //Start from top
    int i = 0;
    while (thisCurrentNode){
        i++;
        cout << "Node #" << i << ": Name: " << thisCurrentNode->name << endl;   //Print the string
        ptrRunFct = thisCurrentNode->ptrFunction;
        ptrRunFct();
        cout << endl;
        thisCurrentNode = thisCurrentNode->nextNode;
    }
}

节点结构是这样定义的：

struct node{                            //A node struct to implement a linked list
    string name;                        //Some data
    void (linkedFct::*ptrFunction)();   //A pointer to member function... ****[That's what I am trying!!!]****
    struct node *nextNode;              //Pointer to next node
};

试图在同一类中操纵成员函数指针

0 个答案: