Re: Remove useless casts to (char *)

From: Peter Eisentraut <peter(at)eisentraut(dot)org>
To: Dagfinn Ilmari Mannsåker <ilmari(at)ilmari(dot)org>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Remove useless casts to (char *)
Date: 2025-02-23 14:23:57
Message-ID: 108db65b-1ed2-4c13-8ac3-034998bdbe34@eisentraut.org
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I have committed the rest of this with the adjustments you suggested.

On 10.02.25 18:44, Dagfinn Ilmari Mannsåker wrote:
>> Here is a new patch set rebased over that.
>
> I had a more thorough read-through this time (as well as applying and
> building it), and it does make the code a lot more readable.
>
> I noticed you in some places added extra parens around remaining casts
> with offset additions, e.g.
>
> - XLogRegisterData((char *) old_key_tuple->t_data + SizeofHeapTupleHeader,
> + XLogRegisterData(((char *) old_key_tuple->t_data) + SizeofHeapTupleHeader,
> old_key_tuple->t_len - SizeofHeapTupleHeader);
>
> But not in others:
>
> - memcpy((char *) tuple->t_data + SizeofHeapTupleHeader,
> - (char *) data,
> - datalen);
> + memcpy((char *) tuple->t_data + SizeofHeapTupleHeader, data, datalen);
>
>
> I don't have a particularly strong opinion either way (maybe -0.2 on the
> extra parens), but I mainly think we should keep it consistent, and not
> change it gratuitously.
>
> Greppig indicates to me that the paren-less version is more common:
>
> $ git grep -P '\(\w+\s*\**\) [\w>-]+ \+ \w+' | wc -l
> 283
> $ git grep -P '\(\(\w+\s*\**\) [\w>-]+\) \+ \w+' | wc -l
> 96
>
> So I think we should leave them as they are.
>
> - ilmari
>
>

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