4coder/4ed_doubly_linked_list.cpp

23 lines
710 B
C++

/*
* Mr. 4th Dimention - Allen Webster
*
* 01.03.2016
*
* generic dynamically linked list
*
*/
// NOTE(allen): These macros are setup to work on structs
// with a next and prev pointer where the type of the struct
// is the same as the type of the next/prev pointers.
#define dll_init_sentinel(s) do{ (s)->next=(s); (s)->prev=(s); }while(0)
#define dll_insert(p,v) do{ (v)->next=(p)->next; (v)->prev=(p); (p)->next=(v); (v)->next->prev=(v); }while(0)
#define dll_remove(v) do{ (v)->next->prev = (v)->prev; (v)->prev->next = (v)->next; }while(0)
// for(dll_items(iterator, sentinel_ptr)){...}
#define dll_items(it, st) ((it) = (st)->next); ((it) != (st)); ((it) = (it)->next)
// BOTTOM