Re: 80386 C compiler

From	Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups	comp.lang.c
Subject	Re: 80386 C compiler
Date	2024-11-29 21:00 -0800
Organization	A noiseless patient Spider
Message-ID	<865xo5pb8b.fsf@linuxsc.com> (permalink)
References	(7 earlier) <20241127112746.171@kylheku.com> <vi7tmc$4ur3$4@dont-email.me> <20241127134839.469@kylheku.com> <vi88n4$74j9$1@dont-email.me> <20241128201403.206@kylheku.com>

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Kaz Kylheku <643-408-1753@kylheku.com> writes:

> On 2024-11-27, James Kuyper <jameskuyper@alumni.caltech.edu> wrote:
>
>> If there weren't a rule mandating the order in which initializers
>> were applied, when two or more initializers affect the same
>> object, it wouldn't be possible to be certain which one overrode
>> the others.

That's wrong.  The priority rule for initializing the same subobject
depends not on order of evaluation but on syntactic order.  There
doesn't have to be a rule for evaluation order to make the order
of subobject overriding be well defined.

> It would make sense for that simply to be a constraint violation;
> two initializations for the same object are being requested.

It isn't that simple.  There are situations where overriding the
initialization of a particular subobject makes sense, and is
useful.  Example:

   typedef struct { int x, y; } Bas;
   typedef struct { Bas b[2]; } Foo;

   Foo
   sample_foo( Bas b ){
      Foo foo = { b, b, .b[1].y = -1 };
      return  foo;
   }

The subobject .b[1].y is overridden, but we can't take the previous
initialization of .b[1] without changing the semantics.

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Re: 80386 C compiler Kaz Kylheku <643-408-1753@kylheku.com> - 2024-11-27 19:42 +0000
  Re: 80386 C compiler James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-27 14:59 -0500
    Re: 80386 C compiler Kaz Kylheku <643-408-1753@kylheku.com> - 2024-11-27 21:52 +0000
      Re: 80386 C compiler James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-27 18:07 -0500
        Re: 80386 C compiler Kaz Kylheku <643-408-1753@kylheku.com> - 2024-11-30 01:30 +0000
          Re: 80386 C compiler Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-11-29 21:00 -0800
          Re: 80386 C compiler James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-30 09:00 -0500
  Re: 80386 C compiler David Brown <david.brown@hesbynett.no> - 2024-11-28 09:12 +0100

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