Using an STL map, wrong number of template arguments? - c++

Question

I'm having a little trouble utilizing a map, and I have never really used them before so I am really struggling here
My Code is as follows:
MSTapp.h
5 #ifndef MSTAPP_H
6 #define MSTAPP_H
7
8 #include"Graph.h"
9
10 #include<iostream>
11 #include<map>
12 #include<vector>
13 #include<string>
14
15 using namespace std;
16
17 class MSTapp
18 {
19 public:
20 void read_graph();
21 void print_v();
22 // void print_e();
23
24 private:
25 Graph my_graph;
26 };
27
28 #endif
29
MSTapp.cpp
5 #include"MSTapp.h"
6 #include"Graph.h"
7
8 #include<iostream>
9 #include<map>
10 #include<vector>
11 #include<stdlib.h>
12 #include<sstream>
13 #include<string>
14
15 using namespace std;
16
17 void MSTapp::read_graph()
18 {
19 string s;
20 int count = 0;
21
22 while(getline(cin, s))
23 {
24 if(count == 0)
25 {
26 istringstream my_words(s);
27 string word;
28 while(my_words >> word)
29 {
30 my_graph.add_vertex(word);
31 }
32 }
33 else
34 {
35 string first;
36 string last;
37 int key;
38
39 first = s.substr(0, s.find(" "));
40 s.erase(0,s.find(" ")+1);
41 last = s.substr(0, s.find(" "));
42 s.erase(0,s.find(" ")+1);
43 key = atoi(s.c_str());
44
45 my_graph.add_edge(first, last, key);
46 }
47 }
48 }
49
50 void MSTapp::print_v()
51 {
52 my_graph.print_vertices();
53 }
Graph.h
5 #include"MSTapp.h"
6 #include<map>
7 #include<iostream>
8 #include<string>
9 #include<vector>
10 #include<list>
11
12 using namespace std;
13
14 #ifndef GRAPH_H
15 #define GRAPH_H
16
17 class Graph
18 {
19 public:
20 // Graph();
21 // ~Graph();
22 void add_vertex(string name);
23 void print_vertices();
24 void add_edge(string from, string to, int weight);
25 // void print_edges();
26 // void min_span_tree(string start);
27
28 private:
29 // MinPriority min_queue;
30
31 class Vertex
32 {
33 public:
34 string name;
35 string pi;
36 int key;
37 };
38 class Neighbor
39 {
40 public:
41 string name;
42 int weight;
43 };
44
45 vector<Vertex> vertices;
46 map <string name, list<Neighbor> > adj_list;
4
48 };
49
50 #endif
Graph.cpp
5 #include"MSTapp.h"
6 #include"Graph.h"
7
8 #include<iostream>
9 #include<map>
10 #include<algorithm> // sort
11 #include<string>
12 #include<vector>
13 #include<list>
14
15 using namespace std;
35 void Graph::add_vertex(string name)
36 {
37 Vertex v1;
38 v1.name = name;
39 v1.pi = "NIL";
40 v1.key = 100;
41 bool check;
42
43 for(int i = 0; i < vertices.size(); i++)
44 {
45 if(vertices[i].name == v1.name)
46 {
47 check = true;
48 }
49 }
50
51 if(check == false)
52 {
53 vertices.push_back(v1);
54 }
55 }
56
57 void Graph::print_vertices()
58 {
59 for(int i = 0; i < vertices.size(); i++)
60 {
61 cout << vertices[i].name << " " << vertices[i].pi << " " << vertices[i].key << endl;
62 }
63 }
64
65 void Graph::add_edge(string from, string to, int weight)
66 {
67 string v_from = from;
68 string v_to = to;
69 int v_weight = weight;
70
71 Neighbor n1;
72 n1.name = v_to;
73 n1.weight = v_weight;
74
75 adj_list[v_from];
76 adj_list[v_from].push_back(n1);
77 adj_list[v_from].sort();
78 }
All the functions for the Vertices are working so just ignore those. The main problem I am having is the add_edge function in the Graph. For example my input would be something as follows:
A B C D E //Vertices, this is working
A B 3
so, with the A B 3, I would like to add the B and 3 the the neighbor, and do something like
adj_list[A].push_back(Neighbor)
The errors I am getting are regarding the map, it is saying I have the incorrect number of template arguments for the map in Graph.h.
Am I declaring my map incorrectly on line 46 of Graph.h?
If anyone could provide any insight as to what I am doing wrong or how I can get this working it would be GREATLY appreciated. If any additional clarifcation is needed, just ask. Thanks!

Answer 1

you should declare the map as:
map <string, list<Neighbor> > adj_list;