4coder/4ed_linked_node_macros.h

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/*
* Mr. 4th Dimention - Allen Webster
*
* 01.03.2016
*
* generic dynamically linked list
*
*/
// TOP
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// 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) (s)->next=(s),(s)->prev=(s)
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#define dll_insert(p,n) (n)->next=(p)->next,(n)->prev=(p),(p)->next=(n),(n)->next->prev=(n)
#define dll_insert_back(p,n) (n)->prev=(p)->prev,(n)->next=(p),(p)->prev=(n),(n)->prev->next=(n)
#define dll_remove(n) (n)->next->prev=(n)->prev,(n)->prev->next=(n)->next
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// HACK(allen): I don't like this anymore, get rid of it.
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// for(dll_items(iterator, sentinel_ptr)){...}
#define dll_items(it, st) ((it) = (st)->next); ((it) != (st)); ((it) = (it)->next)
// NOTE(allen): These macros work on structs with a next
// pointer to the saem type as the containing struct.
#define sll_push(f,l,n) if((f)==0&&(l)==0){(f)=(l)=(n);}else{(l)->next=(n);(l)=(n);}(l)->next=0
#define sll_pop(f,l) if((f)!=(l)){(f)=(f)->next;}else{(f)=(l)=0;}
#define sll_init_sentinel(s) do{ (s)->next=(s); }while(0)
#define sll_insert(p,v) do{ (v)->next=(p)->next; (p)->next = (v); }while(0)
#define sll_remove(p,v) do{ Assert((p)->next == (v)); (p)->next = (v)->next; }while(0)
// HACK(allen): I don't like this anymore, get rid of it.
// for(sll_items(iterator, sentinel_ptr)){...}
#define sll_items(it, st) ((it) = (st)->next); ((it) != (st)); ((it) = (it)->next)
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// BOTTOM