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cf707aa70d
Previously one had to use slist_delete(), implying an additional scan of the list, making this infrastructure considerably less efficient than traditional Lists when deletion of element(s) in a long list is needed. Modify the slist_foreach_modify() macro to support deleting the current element in O(1) time, by keeping a "prev" pointer in addition to "cur" and "next". Although this makes iteration with this macro a bit slower, no real harm is done, since in any scenario where you're not going to delete the current list element you might as well just use slist_foreach instead. Improve the comments about when to use each macro. Back-patch to 9.3 so that we'll have consistent semantics in all branches that provide ilist.h. Note this is an ABI break for callers of slist_foreach_modify(). Andres Freund and Tom Lane |
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