From: Howard Chu <hyc@symas.com>
To: git@vger.kernel.org
Subject: Re: [PATCH 02/16] refs: add methods for misc ref operations
Date: Fri, 18 Dec 2015 04:06:20 +0000 (UTC) [thread overview]
Message-ID: <loom.20151218T050438-482@post.gmane.org> (raw)
In-Reply-To: xmqqmvtgd06p.fsf@gitster.mtv.corp.google.com
Junio C Hamano <gitster <at> pobox.com> writes:
>
> David Turner <dturner <at> twopensource.com> writes:
>
> > struct ref_be {
> > struct ref_be *next;
> > const char *name;
> > ref_transaction_commit_fn *transaction_commit;
> > +
> > + pack_refs_fn *pack_refs;
> > + peel_ref_fn *peel_ref;
> > + create_symref_fn *create_symref;
> > +
> > + resolve_ref_unsafe_fn *resolve_ref_unsafe;
> > + verify_refname_available_fn *verify_refname_available;
> > + resolve_gitlink_ref_fn *resolve_gitlink_ref;
> > };
>
> This may have been pointed out in the previous reviews by somebody
> else, but I think it is more customary to declare a struct member
> that is a pointer to a customization function without leading '*',
> i.e.
>
> typedef TYPE (*customize_fn)(ARGS);
>
> struct vtable {
> ...
> cutomize_fn fn;
> ...
> };
>
> in our codebase (cf. string_list::cmp, prio_queue::compare).
(LMDB author here, just passing by)
IMO you're making a mistake. You should always typedef the thing itself, not
a pointer to the thing. If you only typedef the pointer, you can only use
the typedef to declare pointers and never the thing itself. If you typedef
the actual thing, you can use the typedef to declare both the thing and
pointer to thing.
It's particularly useful to have function typedefs because later on you can
use the actual typedef to declare instances of that function type in header
files, and guarantee that your function definitions match what they're
intended to match. Otherwise, assigning a bare (*func) to something that
mismatches only generates a warning, instead of an error.
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
next prev parent reply other threads:[~2015-12-18 4:10 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-03 0:35 [PATCH 00/16] LMDB refs backend atop pre-vtable David Turner
2015-12-03 0:35 ` [PATCH 01/16] refs: add a backend method structure with transaction functions David Turner
2015-12-05 0:07 ` Junio C Hamano
2015-12-03 0:35 ` [PATCH 02/16] refs: add methods for misc ref operations David Turner
2015-12-11 23:33 ` Junio C Hamano
2015-12-11 23:49 ` David Turner
2015-12-11 23:39 ` Junio C Hamano
2015-12-11 23:49 ` David Turner
2015-12-12 0:23 ` Junio C Hamano
2015-12-12 0:48 ` David Turner
2015-12-18 4:06 ` Howard Chu [this message]
2015-12-03 0:35 ` [PATCH 03/16] refs: add methods for the ref iterators David Turner
2016-01-03 0:06 ` David Aguilar
2016-01-04 19:01 ` Junio C Hamano
2016-01-05 13:43 ` Michael Haggerty
2016-01-05 18:56 ` Junio C Hamano
2016-01-04 19:12 ` Ronnie Sahlberg
2016-01-04 20:26 ` Junio C Hamano
2016-01-05 1:17 ` Jeff King
2016-01-05 3:29 ` Junio C Hamano
2015-12-03 0:35 ` [PATCH 04/16] refs: add do_for_each_per_worktree_ref David Turner
2015-12-11 23:52 ` Junio C Hamano
2015-12-12 0:01 ` David Turner
2015-12-03 0:35 ` [PATCH 05/16] refs: add methods for reflog David Turner
2015-12-03 0:35 ` [PATCH 06/16] refs: add method for initial ref transaction commit David Turner
2015-12-03 0:35 ` [PATCH 07/16] refs: add method for delete_refs David Turner
2015-12-03 0:35 ` [PATCH 08/16] refs: add methods to init refs backend and db David Turner
2015-12-23 5:33 ` Michael Haggerty
2015-12-23 6:54 ` David Turner
2015-12-03 0:35 ` [PATCH 09/16] refs: add method to rename refs David Turner
2015-12-03 0:35 ` [PATCH 10/16] refs: make lock generic David Turner
2015-12-03 0:35 ` [PATCH 11/16] refs: move duplicate check to common code David Turner
2015-12-23 6:27 ` Michael Haggerty
2016-01-05 16:42 ` David Turner
2015-12-03 0:35 ` [PATCH 12/16] refs: always handle non-normal refs in files backend David Turner
2015-12-23 8:02 ` Michael Haggerty
2016-01-06 0:13 ` David Turner
2016-01-06 23:41 ` [PATCH/RFC v2 1/3] refs: allow log-only updates David Turner
2016-01-06 23:41 ` [PATCH/RFC v2 2/3] refs: resolve symbolic refs first David Turner
2016-01-06 23:41 ` [PATCH/RFC v2 3/3] refs: always handle non-normal refs in files backend David Turner
2016-01-08 12:52 ` David Turner
2016-01-06 23:42 ` [PATCH 12/16] " David Turner
2015-12-03 0:35 ` [PATCH 13/16] init: allow alternate backends to be set for new repos David Turner
2015-12-05 0:07 ` Junio C Hamano
2015-12-05 6:30 ` Duy Nguyen
2015-12-05 7:44 ` Jeff King
2015-12-08 0:38 ` David Turner
2015-12-23 9:52 ` Michael Haggerty
2015-12-23 20:01 ` Jeff King
2015-12-10 18:02 ` Jeff King
2015-12-10 19:36 ` David Turner
2015-12-23 11:30 ` [PATCH] clone: use child_process for recursive checkouts Michael Haggerty
2016-01-06 23:41 ` David Turner
2015-12-23 13:34 ` [PATCH 13/16] init: allow alternate backends to be set for new repos Michael Haggerty
2016-01-05 17:26 ` David Turner
2016-01-05 18:03 ` Junio C Hamano
2016-01-05 18:24 ` David Turner
2016-01-06 12:02 ` Michael Haggerty
2016-01-06 12:52 ` Duy Nguyen
2016-01-07 3:31 ` Shawn Pearce
2015-12-03 0:35 ` [PATCH 14/16] refs: allow ref backend to be set for clone David Turner
2015-12-23 13:51 ` Michael Haggerty
2015-12-23 20:23 ` Eric Sunshine
2015-12-03 0:35 ` [PATCH 15/16] refs: add LMDB refs backend David Turner
2015-12-05 0:08 ` Junio C Hamano
2015-12-05 0:25 ` David Turner
2015-12-17 1:00 ` Jonathan Nieder
2015-12-17 2:31 ` David Turner
2015-12-17 20:49 ` Jonathan Nieder
2015-12-23 14:32 ` Michael Haggerty
2016-01-08 16:05 ` David Turner
2015-12-03 0:35 ` [PATCH 16/16] refs: tests for lmdb backend David Turner
2015-12-22 23:56 ` [PATCH 00/16] LMDB refs backend atop pre-vtable David Turner
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