I want to just create the doubly linked list and check if it is empty. Please tell the mistake. ERROR shown is : In function empty(), head and tail are out of scope. Didn't work when define as struct in class Dict.
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
class node
{ public:
string data;
node* next;
node* prev;
friend class Dict;
};
class Dict
{ public:
bool empty();
Dict();
node* head;
node* tail;
};
Dict::Dict()
{ head=new node;
tail= new node;
head->next=tail;
tail->prev=head;
}
bool empty()
{
return head->next==tail;
}
int main()
{
Dict my_list;
if(my_list.empty())
{cout<<"empty list"<<endl;}
else
{cout<<"Not empty"<<endl;}
}
I think you just need to include the empty method in your class:
bool Dict::empty()
{
return head->next==tail;
}
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