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From: Felipe Contreras <felipe.contreras@gmail.com>
To: Phillip Wood <phillip.wood123@gmail.com>,
	Felipe Contreras <felipe.contreras@gmail.com>,
	git@vger.kernel.org
Cc: "David Aguilar" <davvid@gmail.com>,
	"Junio C Hamano" <gitster@pobox.com>,
	"Sergey Organov" <sorganov@gmail.com>,
	"Bagas Sanjaya" <bagasdotme@gmail.com>,
	"Elijah Newren" <newren@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Denton Liu" <liu.denton@gmail.com>
Subject: Re: [PATCH 6/7] xdiff: simplify style assignments
Date: Thu, 10 Jun 2021 08:50:28 -0500	[thread overview]
Message-ID: <60c218a4e47e9_b25b1208ef@natae.notmuch> (raw)
In-Reply-To: <cc8bbc34-1048-0e7b-c783-33f556843a3f@gmail.com>

Phillip Wood wrote:
> On 09/06/2021 20:28, Felipe Contreras wrote:
> 
> I don't find the commit message explains this change very well
> 
> > There is little value in checking that git_xmerge_style isn't 0 before
> > changing it's default value.
> 
> I think the check is actually that git_xmerge_style isn't -1.

Actually I meant "< 0", but yeah, that's mainly to check the -1 case.

> Why is there little value in the check?

It's explained in the very next sentence.

> > Most of the time it isn't 0 anyway, so just assign the value directly.
> 
> Why to the times when it is zero (or -1) not matter?

When it's 0 it's a no-op, and now it can't be -1.

By default structures are zeroed in git, so the defaults of integers
are 0, and in the case of xmparam_t.style that is no exception.

These are all the same:

	static xmparam_t xmp;

	static xmparam_t xmp;
	xmp.style = 0;

	static xmparam_t xmp;
	if (1)
		xmp.style = 0;

But of course as it's explained most of the time that's not what
happens, what happens is:

  if (1)
    xml.style = 1;

Perhaps this is clearer:

  There is little value in checking that git_xmerge_style isn't < 0
  before changing its value to xmp.style. If it's 0 then assigning 0 to
  xmp.style is a no-op, and if it's 1 (as it usually is), we are going
  to assign the value anyway.

  The only exception is when git_xmerge_style is -1, but there is no
  value in having that as default, so we just don't, and set the default
  to 0.

Cheers.

-- 
Felipe Contreras

  reply	other threads:[~2021-06-10 13:51 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-09 19:28 [PATCH 0/7] Make diff3 the default conflict style Felipe Contreras
2021-06-09 19:28 ` [PATCH 1/7] test: add merge style config test Felipe Contreras
2021-06-09 19:42   ` Eric Sunshine
2021-06-09 20:29     ` Felipe Contreras
2021-06-10  9:18   ` Phillip Wood
2021-06-10 13:26     ` Felipe Contreras
2021-06-10 14:54       ` Phillip Wood
2021-06-10 16:34         ` Felipe Contreras
2021-06-10 14:58       ` Phillip Wood
2021-06-10 16:47         ` Felipe Contreras
2021-06-11  9:19           ` Phillip Wood
2021-06-11 14:39             ` Felipe Contreras
2021-06-09 19:28 ` [PATCH 2/7] merge-tree: fix merge.conflictstyle handling Felipe Contreras
2021-06-09 19:28 ` [PATCH 3/7] notes: " Felipe Contreras
2021-06-09 19:28 ` [PATCH 4/7] checkout: " Felipe Contreras
2021-06-10  9:32   ` Phillip Wood
2021-06-10 14:11     ` Felipe Contreras
2021-06-10 14:50       ` Phillip Wood
2021-06-10 16:32         ` Felipe Contreras
2021-06-11  9:18           ` Phillip Wood
2021-06-11 14:34             ` Felipe Contreras
2021-06-11  9:18   ` Phillip Wood
2021-06-09 19:28 ` [PATCH 5/7] xdiff: rename XDL_MERGE_STYLE_DIFF3 Felipe Contreras
2021-06-10  9:21   ` Phillip Wood
2021-06-10 13:33     ` Felipe Contreras
2021-06-11  3:17     ` Junio C Hamano
2021-06-11 13:42       ` Felipe Contreras
2021-06-09 19:28 ` [PATCH 6/7] xdiff: simplify style assignments Felipe Contreras
2021-06-10  9:26   ` Phillip Wood
2021-06-10 13:50     ` Felipe Contreras [this message]
2021-06-09 19:28 ` [PATCH 7/7] xdiff: make diff3 the default conflictStyle Felipe Contreras
2021-06-10  6:41   ` Johannes Sixt
2021-06-10  7:53     ` Đoàn Trần Công Danh
2021-06-10 13:18       ` Felipe Contreras
2021-06-10 13:18     ` Felipe Contreras
2021-06-10 13:49     ` Jeff King
2021-06-10 16:00       ` Felipe Contreras
2021-06-10 16:31         ` Jeff King
2021-06-11  1:20       ` Junio C Hamano
2021-06-11  6:23         ` Johannes Sixt
2021-06-11  6:43           ` Junio C Hamano
2021-06-11  7:02             ` Johannes Sixt
2021-06-11  7:14               ` Junio C Hamano
2021-06-11 11:51                 ` Sergey Organov
2021-06-11 15:32                   ` Felipe Contreras
2021-06-11 15:52                     ` Sergey Organov
2021-06-11 16:36                       ` Felipe Contreras
     [not found]                     ` <CABPp-BHRQSF2_aYTBfpfnW4Bh3Hz7vLFj_QNGj8R4WeCS6_utw@mail.gmail.com>
2021-06-11 17:57                       ` Felipe Contreras
2021-06-11 19:02                         ` Elijah Newren
2021-06-11 21:05                           ` Felipe Contreras
2021-06-11 21:40                             ` Elijah Newren
2021-06-13 14:34                               ` Felipe Contreras
2021-06-11 16:41                   ` Johannes Sixt
2021-06-11 17:21                     ` Felipe Contreras
2021-06-11 17:40                       ` Sergey Organov
2021-06-11 18:10                         ` Felipe Contreras
2021-06-11 18:22                           ` Sergey Organov
2021-06-11 14:28                 ` Felipe Contreras
2021-06-11 14:25               ` Felipe Contreras
2021-06-11 16:53                 ` Johannes Sixt
     [not found]                 ` <CABPp-BH0aRiSUw03nSK6jHRNQ+zcpUzr6WjeJ5GpdUCqCKxbag@mail.gmail.com>
2021-06-11 17:32                   ` Felipe Contreras
2021-06-11 17:57                     ` Elijah Newren
2021-06-11 18:28                       ` Felipe Contreras
2021-06-11 14:20           ` Felipe Contreras
2021-06-11 14:09         ` Felipe Contreras
2021-06-10  9:40   ` Phillip Wood
2021-06-10 14:19     ` Felipe Contreras
2021-06-17 17:40 ` [PATCH 0/7] Make diff3 the default conflict style Phillip Wood
2021-06-17 18:24   ` Felipe Contreras

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