Path: ...!news.mixmin.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: James Kuyper <jameskuyper@alumni.caltech.edu>
Newsgroups: comp.lang.c
Subject: =?UTF-8?Q?Re=3A_technology_discussion_=E2=86=92_does_the_world_need?=
 =?UTF-8?B?IGEgIm5ldyIgQyA/?=
Date: Sat, 6 Jul 2024 14:26:47 -0400
Organization: A noiseless patient Spider
Lines: 23
Message-ID: <v6c298$3tko2$1@dont-email.me>
References: <v66eci$2qeee$1@dont-email.me> <v67gt1$2vq6a$2@dont-email.me>
 <v687h2$36i6p$1@dont-email.me> <871q48w98e.fsf@nosuchdomain.example.com>
 <v68dsm$37sg2$1@dont-email.me> <87wmlzvfqp.fsf@nosuchdomain.example.com>
 <v6ard1$3ngh6$4@dont-email.me> <v6b0jv$3nnt6$1@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Injection-Date: Sat, 06 Jul 2024 20:26:48 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="2f8b04a7cbca5d04ee14b3b75be7b597";
	logging-data="4117250"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX18aEyP8pFFpWMWGnWvrm/JPbxhuLBvbVtk="
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:IJ1GtIzS9edF9/qG76xIWkKMir8=
Content-Language: en-US
In-Reply-To: <v6b0jv$3nnt6$1@dont-email.me>
Bytes: 2452

On 7/6/24 04:51, BGB wrote:
....
> Yeah, and in the 1D case, an array can be seen as functionally an
> implicitly defined pointer with an assigned size and preassigned
> backing memory.
>
> Granted, C generally allows one to see the backing memory, but not the
> implicit pointer to said backing memory. I guess one could argue that
> if one can't take the address of it, it doesn't exist, but yeah...

C won't let you take that pointer's address because it need not exist,
and in my experience, usually doesn't. Compilers that I'm familiar with
often store all objects that are local to given scope in a single block
of memory whose starting address is stored in a register. No memory is
set aside to store separate pointer objects pointing to any of those
individual objects. When a pointer value pointing at one of those
objects is needed, a fixed offset is added to the address stored in that
register. Are you familiar with any compilers that handle such things
differently? I make no claim to wide knowledge of compilers, but the
compilers that I used which work that way are among the most widely used
C compilers.