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Groups > comp.lang.c > #150812

Re: allocating two objects in one malloc

From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.lang.c
Subject Re: allocating two objects in one malloc
Date 2020-03-24 20:58 +0000
Organization A noiseless patient Spider
Message-ID <87h7yd1nco.fsf@bsb.me.uk> (permalink)
References (7 earlier) <buiakg-egj2.ln1@mail.home.palmen-it.de> <67e8bd22-fea3-43ad-9484-0cfba94c3352@googlegroups.com> <0600b6ae-a692-47d8-8e15-c0eb5286a8da@googlegroups.com> <r5d9bt$4ak$1@dont-email.me> <fLreG.468338$ss1.301745@fx42.iad>

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Richard Damon <Richard@Damon-Family.org> writes:

> As a 'compromise', the committee created a new syntax, the [], which was
> clearer than the 0 (which might have occurred by accident if the size
> was a macro or computed, while still allowing the compiler to optimize
> most array accesses to known sized arrays.

(not really replying... just finding a post to attach this remark to.)

The [] syntax has another advantage: a compiler can tell you when you
use it in dangerous contexts.  An array of structs with a flexible array
member is not meaningful, as is using one as a member of another struct.
An array of size 1 might, at a pinch, be just that, and complaining
about it being used in those contexts could be annoying.

-- 
Ben.

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Thread

allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-18 10:14 -0700
  Re: allocating two objects in one malloc Bonita Montero <Bonita.Montero@gmail.com> - 2020-03-18 18:17 +0100
    Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-18 10:55 -0700
      Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-18 11:01 -0700
      Re: allocating two objects in one malloc felix@palmen-it.de (Felix Palmen) - 2020-03-18 19:14 +0100
        Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-18 11:35 -0700
          Re: allocating two objects in one malloc felix@palmen-it.de (Felix Palmen) - 2020-03-18 19:44 +0100
            Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-18 12:07 -0700
              Re: allocating two objects in one malloc Bart <bc@freeuk.com> - 2020-03-18 20:39 +0000
                Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-18 13:52 -0700
              Re: allocating two objects in one malloc felix@palmen-it.de (Felix Palmen) - 2020-03-18 23:11 +0100
                Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-18 16:48 -0700
                Re: allocating two objects in one malloc Bart <bc@freeuk.com> - 2020-03-19 01:16 +0000
                Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-24 06:11 -0700
                Re: allocating two objects in one malloc Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-24 14:49 +0000
                Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-24 08:46 -0700
                Re: allocating two objects in one malloc James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-24 07:50 -0700
                Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-24 08:48 -0700
                Re: allocating two objects in one malloc chad <cdalten@gmail.com> - 2020-03-19 05:15 -0700
                Re: allocating two objects in one malloc James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-24 08:11 -0700
                Re: allocating two objects in one malloc Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-03-24 11:35 -0400
                Re: allocating two objects in one malloc Richard Damon <Richard@Damon-Family.org> - 2020-03-24 13:50 -0400
                Re: allocating two objects in one malloc Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-24 20:58 +0000
                Re: allocating two objects in one malloc Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-03-24 13:10 -0700
                Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-24 08:52 -0700
                Re: allocating two objects in one malloc Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-03-24 13:05 -0700
          Re: allocating two objects in one malloc Bonita Montero <Bonita.Montero@gmail.com> - 2020-03-18 19:53 +0100
          Re: allocating two objects in one malloc Bart <bc@freeuk.com> - 2020-03-18 20:29 +0000
          Re: allocating two objects in one malloc jadill33@gmail.com - 2020-03-18 13:44 -0700
          Re: allocating two objects in one malloc Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-18 21:00 +0000
  Re: allocating two objects in one malloc Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-03-18 10:18 -0700
  Re: allocating two objects in one malloc felix@palmen-it.de (Felix Palmen) - 2020-03-18 18:43 +0100
    Re: allocating two objects in one malloc Bonita Montero <Bonita.Montero@gmail.com> - 2020-03-18 18:55 +0100
      Re: allocating two objects in one malloc Thiago Adams <thiago.adams@gmail.com> - 2020-03-18 10:56 -0700
        Re: allocating two objects in one malloc Bonita Montero <Bonita.Montero@gmail.com> - 2020-03-18 19:06 +0100
      Re: allocating two objects in one malloc felix@palmen-it.de (Felix Palmen) - 2020-03-18 19:01 +0100
    Re: allocating two objects in one malloc James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-18 14:21 -0400
      Re: allocating two objects in one malloc felix@palmen-it.de (Felix Palmen) - 2020-03-18 19:30 +0100
        Re: allocating two objects in one malloc James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-18 15:08 -0400

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