Feature or enhancement

Proposal:

In the implementation of the reference cycle garbage collector,gc.c file, I have noticed that we use the followingfor-loop pattern over and over to traverse aPyGC_Head list:

for (gc=GC_NEXT(list);gc!=list;gc=GC_NEXT(gc)) {/* ... */}

However, inpycore_llist.h we avoided that by usingllist_for_each macro as:

// Iterate over a list.#definellist_for_each(node,head) \    for (node = (head)->next; node != (head); node = node->next)

I propose adding a new macro asgc_list_for_each to thegc_list_xxx family to serve the same purpose:

#definegc_list_for_each(gc,list) \    for (gc = GC_NEXT((list)); gc != (list); gc = GC_NEXT(gc))

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response