c++ - Building an adjacency list graph using link list / vector -


this first go @ building graph , i've decide use ll connect vectors (or nodes or elements, whatever they're called) , each 1 of nodes has vector holds pointers nodes. i've created "addedge" function in graph class seems breaking program. addelement class seems working fine, add , print them out perfectly. when try add edge, breaks. went through debugger , breaks @

while(curr->next != null || curr->val != n)

any ideas why?

#include "element.h" #include "vector" #include "iostream" #include "functional"  using namespace std;  class graph { public:     element *head;      graph(int v)     {         head = null;         vector <element*> nodes;     }      void addelement(int val)     {         if (head == null)          {             element *newelement = new element(null, null, val);             head = newelement;             return ;         }         element *newelement = new element(null,null, val);         element *curr = head;         while(curr->next != null)         {             curr = curr->next;         }         curr->next = newelement;         newelement->prev = curr;         return;     }     void addedge(int n, int edge)     {         element *e = head;         element *curr = head;          if(curr = null)         {             cout<<"there no elements in graph connect";             return;         }         while(e->next != null || e->val != edge)         {             cout<<"looking";             e = e->next;         }         if(e->val != edge)         {             cout<<"your edge node doesn't exist";             return;         }         while(curr->next != null || curr->val != n)         {             cout<<"looking main node";             curr = curr->next;         }             if(curr->val != n)         {             cout<<"could not find main node";             return;         }         curr->edges.push_back(e);         cout<<"edge connected";         return;     }

node class

#include "vector" #include "iostream" #include "functional"  using namespace std; class element { public:     element(element* n = null, element *p = null, int num = null)     {         val = num;         next = n;         prev = p;     }     int val;     element *prev;     element *next;     vector<element*> edges; };


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