c++ - Can someone explain to me how this loop works within function only? -

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studying linked lists , not sure how loop works assignment.

the code intended find intersection of 2 linked lists. 

listnode *getintersectionnode(listnode *heada, listnode *headb) {     listnode *cur1 = heada, *cur2 = headb;     while(cur1 != cur2){         cur1 = cur1 ? cur1->next : headb;         cur2 = cur2 ? cur2->next : heada;     }     return cur1; }

i'm not sure how cur1 = cur1 evaluated assignments rather boolean condition. understand how iteration works unsure of why can't do: 

while(cur1 != cur2){     cur1 = cur1->next;     cur2 = cur2->next; } return cur1;

with i'm pretty sure end runtime error though.

cur1 = cur1?cur1->next:headb;

is ternary operator. checking if cur1 null before trying "move on next node" equivalent to:

if (cur1 != null){cur1 = cur1->next;} else {cur1 = headb;}

the issue version proposed if cur1 happens null, segmentation fault.


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