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From: Jeff King <peff@peff.net>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 2/5] streaming.c: remove enum/function/vtbl indirection
Date: Wed, 5 May 2021 09:42:09 -0400	[thread overview]
Message-ID: <YJKgsfJXMsR47CkW@coredump.intra.peff.net> (raw)
In-Reply-To: <patch-2.5-13061f01212-20210505T122816Z-avarab@gmail.com>

On Wed, May 05, 2021 at 02:33:29PM +0200, Ævar Arnfjörð Bjarmason wrote:

> Remove the indirection of discovering a function pointer to use via an
> enum and virtual table. This refactors code added in
> 46bf043807c (streaming: a new API to read from the object store,
> 2011-05-11).
> 
> We can instead simply return an "open_istream_fn" for use from the
> "istream_source()" selector function directly. This allows us to get
> rid of the "incore", "loose" and "pack_non_delta" enum
> variables. We'll return the functions instead.
> 
> The "stream_error" variable in that enum can likewise go in favor of
> returning NULL, which is what the open_istream() was doing when it got
> that value anyway.
> 
> We can thus remove the entire enum, and the "open_istream_tbl" virtual
> table that (indirectly) referenced it.

Yeah, I think this is simpler. The value of the vtable was that we might
have added more functions to it, but we haven't done so over the course
of the last 10 years. And I have trouble imagining for what purpose we
would. So it seems like unnecessary complexity.

-Peff

  reply	other threads:[~2021-05-05 13:42 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-05 12:33 [PATCH 0/5] streaming.c: refactor for smaller + easier to understand code Ævar Arnfjörð Bjarmason
2021-05-05 12:33 ` [PATCH 1/5] streaming.c: avoid forward declarations Ævar Arnfjörð Bjarmason
2021-05-05 12:33 ` [PATCH 2/5] streaming.c: remove enum/function/vtbl indirection Ævar Arnfjörð Bjarmason
2021-05-05 13:42   ` Jeff King [this message]
2021-05-06  0:14     ` Junio C Hamano
2021-05-05 12:33 ` [PATCH 3/5] streaming.c: remove {open,close,read}_method_decl() macros Ævar Arnfjörð Bjarmason
2021-05-05 13:44   ` Jeff King
2021-05-05 12:33 ` [PATCH 4/5] streaming.c: stop passing around "object_info *" to open() Ævar Arnfjörð Bjarmason
2021-05-05 13:49   ` Jeff King
2021-05-05 12:33 ` [PATCH 5/5] streaming.c: move {open,close,read} from vtable to "struct git_istream" Ævar Arnfjörð Bjarmason
2021-05-05 13:55   ` Jeff King
2021-05-05 13:57 ` [PATCH 0/5] streaming.c: refactor for smaller + easier to understand code Jeff King

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