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From: ZheNing Hu <adlternative@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Christian Couder <christian.couder@gmail.com>,
	ZheNing Hu via GitGitGadget <gitgitgadget@gmail.com>,
	git <git@vger.kernel.org>, Jeff King <peff@peff.net>,
	Hariom Verma <hariom18599@gmail.com>
Subject: Re: [PATCH v2 2/2] [GSOC] ref-filter: introduce enum atom_type
Date: Tue, 11 May 2021 20:53:11 +0800	[thread overview]
Message-ID: <CAOLTT8T-pUc7SOaivdydXHXm+_-hY=ARpWqGA_OOnej8gRrMCA@mail.gmail.com> (raw)
In-Reply-To: <xmqq7dk5ol3c.fsf@gitster.g>

Junio C Hamano <gitster@pobox.com> 于2021年5月11日周二 下午2:12写道:
>
> Christian Couder <christian.couder@gmail.com> writes:
>
> >> I find it far more intuitive to say
> >>
> >>         for (i = 0; i < ATOM_INVALID; i++)
> >>
> >> than having to say UNKNOWN+1.
> >
> > Yeah, that's more intuitive. But in my opinion, using `ATOM_UNKNOWN +
> > 1` instead of `0` at least shouldn't often result in more lines of
> > code, and should be a bit easier to get right, compared to having to
> > initialize the field with ATOM_UNKNOWN.
>
> Number of lines is not all that important.
>
> But the developers must remember that UNKNOWN is at the bottom end
> and INVALID is at the top end, which is very taxing.  Tying UNKNOWN
> to the top end and INVALID to the bottom end would equally be
> plausible and there is no memory aid to help us remember which one
> is which.  Compare it to "array indices begin at 0, and the upper
> end is MAX".  Your scheme is much easier for developers to screw up.
>

Yes, UNKNOWN + 1 is difficult to use. But using UNKNOWN = -1,
this means that the coder may indirectly use an init atom_type with
junk value "ATOM_REFNAME", they maybe did't notice they need
reinitialize the value to UNKNOWN.

I thought that perhaps such a naming would be better:

ATOM_BEGIN = ATOM_UNKNOWN + 1,
ATOM_END = ATOM_INVALID

       for (i = ATOM_BEGIN; i < ATOM_END; i++) {
       }

But ATOM_END has been used...

--
ZheNing Hu

  reply	other threads:[~2021-05-11 12:53 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-08 15:22 [PATCH 0/2] [GSOC][RFC] " ZheNing Hu via GitGitGadget
2021-05-08 15:22 ` [PATCH 1/2] [GSOC] ref-filter: add objectsize to used_atom ZheNing Hu via GitGitGadget
2021-05-08 15:22 ` [PATCH 2/2] [GSOC][RFC] ref-filter: introduce enum atom_type ZheNing Hu via GitGitGadget
2021-05-09  6:21   ` Christian Couder
2021-05-09  8:26     ` Junio C Hamano
2021-05-09 13:44       ` ZheNing Hu
2021-05-09 13:40     ` ZheNing Hu
2021-05-10 15:03 ` [PATCH v2 0/2] " ZheNing Hu via GitGitGadget
2021-05-10 15:03   ` [PATCH v2 1/2] [GSOC] ref-filter: add objectsize to used_atom ZheNing Hu via GitGitGadget
2021-05-10 15:03   ` [PATCH v2 2/2] [GSOC] ref-filter: introduce enum atom_type ZheNing Hu via GitGitGadget
2021-05-11  2:14     ` Junio C Hamano
2021-05-11  5:51       ` Christian Couder
2021-05-11  6:12         ` Junio C Hamano
2021-05-11 12:53           ` ZheNing Hu [this message]
2021-05-11 12:37         ` ZheNing Hu
2021-05-11 13:05         ` Junio C Hamano
2021-05-11 12:18       ` ZheNing Hu
2021-05-12 12:11   ` [PATCH v3 0/2] [GSOC][RFC] " ZheNing Hu via GitGitGadget
2021-05-12 12:11     ` [PATCH v3 1/2] [GSOC] ref-filter: add objectsize to used_atom ZheNing Hu via GitGitGadget
2021-05-12 23:11       ` Junio C Hamano
2021-05-13  9:04         ` ZheNing Hu
2021-05-12 12:11     ` [PATCH v3 2/2] [GSOC] ref-filter: introduce enum atom_type ZheNing Hu via GitGitGadget
2021-05-12 23:21       ` Junio C Hamano
2021-05-13  9:25         ` ZheNing Hu
2021-05-13 15:15     ` [PATCH v4 0/2] [GSOC][RFC] " ZheNing Hu via GitGitGadget
2021-05-13 15:15       ` [PATCH v4 1/2] [GSOC] ref-filter: add objectsize to used_atom ZheNing Hu via GitGitGadget
2021-05-13 15:15       ` [PATCH v4 2/2] [GSOC] ref-filter: introduce enum atom_type ZheNing Hu via GitGitGadget

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