我在使用指向视频对象的指针的成员函数时遇到问题。我的代码如下：
vlist.h：
5 #ifndef VLIST_H
6 #define VLIST_H
7
8 #include<iostream>
9 using namespace std;
10
11 #include<string>
12 #include"video.h"
13
14 class Vlist
15 {
16 public:
17 Vlist();
18 // ~Vlist();
19 void insert(Video *vid);
20 // void insert_alphabetical(Video *vid);
21 void print();
22 // void length();
23 bool lookup(string title);
24 bool remove(string title);
25 private:
26 class Node
27 {
28 public:
29 Node(Video *vid, Node *next)
30 {m_vid = vid; m_next = next;}
31 Video *m_vid;
32 Node *m_next;
33 };
34 Node *m_head;
35 };
36
37 #endif
vlist.cpp：
5 #include<iostream>
6 using namespace std;
7
8 #include<string>
9 #include"vlist.h"
10 #include"video.h"
11
12 Vlist::Vlist()
13 {
14 m_head = NULL;
15 }
16
17 void Vlist::insert(Video *vid)
18 {
19 m_head = new Node(vid, m_head);
20 }
21
22 void Vlist::print()
23 {
24 Node *ptr = m_head;
25 while(ptr != NULL)
26 {
27 cout << ptr->m_vid->print();
28 ptr = ptr->m_next;
29 }
30 }
视频.h：
5 #ifndef VIDEO_H
6 #define VIDEO_H
7
8 #include<iostream>
9 using namespace std;
10
11 #include<string>
12
13 class Video
14 {
15 public:
16 Video(string title, string url, string comment,float length, int rating);
17 ~Video();
18 void print();
19
20 private:
21 string m_title;
22 string m_url;
23 string m_comment;
24 float m_length;
25 int m_rating;
26 };
27
28 #endif
视频.cpp：
5 #include<iostream>
6 using namespace std;
7
8 #include<string>
9
10 #include "video.h"
11
12 using namespace std;
13
14 Video::Video(string title, string url, string comment, float length, int rating)
15 {
16 m_title = title;
17 m_url = url;
18 m_comment = comment;
19 m_rating = rating;
20 m_length = length;
21 }
22
23 /* Video::~Video()
24 {
25 cout << "object is desructing" << endl;
26 } */
27
28 void Video::print()
29 {
30 cout << m_title << ", " << m_url << ", " << m_comment << ", " << m_length << ", ";
31 for(int i = 0; i < m_rating; i++)
32 {
33 cout << "*";
34 }
35 cout << endl;
36 }
37
主.cpp：
5 #include<iostream>
6 using namespace std;
7
8 #include<string>
9 #include"video.h"
10 #include"vlist.h"
11
12 int main()
13 {
14 int num_vids = 0;
15 Video *vids;
16 Vlist vlist;
17
18 string title, url, comment; // for title, url, and comment
19 float length; // for the length
20 int rating; // for the rating
21
22 string choice; // what the user wants to do
23
24 cout << "What would you like to do?" << endl;
25 cout << "insert" << endl;
26 cout << "print" << endl;
27 cout << "length" << endl;
28 cout << "lookup" << endl;
29 cout << "remove" << endl;
30
31 while(getline(cin, choice))
32 {
33 if( (choice == "insert") )
34 {
35 getline(cin, title);
36 getline(cin, url);
37 getline(cin, comment);
38 cin >> length;
39 cin >> rating;
40 cin.ignore();
41
42 vids = new Video(title, url, comment, length, rating);
43 vlist.insert(vids);
44 num_vids++;
45 // cout << "you would like to insert something" << endl;
46 }
47
48 else if( (choice == "print") )
49 {
50 // cout << "you would like to print something" << endl;
51 vlist.print();
52 }
53
54 else if( (choice == "length") )
55 {
56 cout << num_vids << endl;
57 }
58
59 else if( (choice == "lookup") )
60 {
61 cout << "you would like to look something up!" << endl;
62 }
63
64 else if( (choice == "remove") )
65 {
66 cout << "you would like to remove something" << endl;
67 }
68
69 if( (choice != "insert") && (choice != "print") && (choice != "length") && (choice != "lookup") && (choice != "remove") )
70 {
71 cerr << choice << " is not a legal command, giving up." << endl;
72 return 1;
73 }
74 }
75
76
77 return 0;
78 }
基本上现在我只是想使用插入和选择。当我输入插入时，我想制作一个新的视频对象并将其放入链表节点中的 m_vid 位置。然后我想调用 print 并执行 vlist.print() 并打印我插入到链接列表中的所有视频。vlist.cpp 的第 27 行没有执行 Video 成员函数打印，我不知道为什么。我收到错误消息 vlist.cpp:27:29: error: no match for 'operator<<' in 'std::cout << ptr->Vlist::Node::m_vid->Video::print()' . 所以我只是试图将视频插入链接列表，然后将它们全部打印出来。出了什么问题？如果您需要任何额外的说明，请告诉我。