The issue I am having is in my set_data() function. I am trying to have it set the data_field variable to d , the variable that is passed into the function, but I am getting segmentation fault whenever I try.
this is the function calling the class
For the test run variable i is an int that I am trying to add to the node data_field. i the int value of i is i = 0.
template<class T>
void dlist<T>::rear_insert(T i){
dnode<T>* temp;
temp -> set_data(i); // function call that is causing the segmentation fault
if(tail == nullptr ){
tail = temp;
head = temp;
} else {
dnode<T>* temp1 = tail;
tail -> set_next(temp);
tail = tail -> next();
tail -> set_previous(temp1);
}
}
Here is the full code I am using for the class giving me the error
template<class T>
class dnode{
public:
dnode(T d = T(), dnode *n = NULL, dnode *p = NULL) {data = d; next = n; previous = p;}
void set_data(T d){
data_field = d; //The line that gives
//segmentation fault
}
void set_next(dnode *n){next_field = n;}
void set_previous(dnode *p){previous_field = p;}
T data()const {return data_field;}
dnode* next() const {return next_field;}
dnode* previous() {return previous_field;}
private:
T data_field;
dnode* next_field;
dnode* previous_field;
};
I have used cout to check if it was recieving the correct data and it was able to print the correct data to the file. the issue is with data_field = d. I have looked over other sources and they have set up the code like I have, I am not sure why I am getting segmentation fault.
void set_data(T d){
cout << d;
//data_field = d;
}
it out puts 0 which is the correct value for d. Uncommenting data_field = d causes the segmentation fault.
In this situation, you'd need to initialize temp to be pointing to something valid. The simplest is to do auto temp = new dnode<T>();