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Re: Shorthand ~> pointers

Subject Re: Shorthand ~> pointers
Newsgroups comp.lang.c, comp.lang.c++
References (3 earlier) <pviobs$k24$1@dont-email.me> <pvm0dr$1e4h$1@adenine.netfront.net> <pvm0gn$u40$1@dont-email.me> <pvngo9$5ma$1@adenine.netfront.net> <pvo27l$i9t$1@dont-email.me>
From Bart <bc@freeuk.com>
Message-ID <7QNTD.36362$ur3.8909@fx28.am4> (permalink)
Organization virginmedia.com
Date 2018-12-23 15:28 +0000

Cross-posted to 2 groups.

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On 23/12/2018 13:24, Rick C. Hodgin wrote:
> On 12/23/2018 3:24 AM, Juha Nieminen wrote:
>> In comp.lang.c++ Rick C. Hodgin <rick.c.hodgin@gmail.com> wrote:
>>>> You might not have control over the names in those structs you are
>>>> adding as members of this struct. Maybe they are structs from some
>>>> libraries that you don't have control over (or otherwise shouldn't
>>>> be changing).
>>>
>>> True.  In those cases, don't use shorthand pointers.  An option could
>>> be added to the compiler to disallow them.
>>
>> How would you know in advance that, perhaps, months or years from now
>> there might be such a naming conflict?
>>
>> Besides, it's silly that variable names in one struct or class
>> (which in C++ may even be private) may cause a conflict with names
>> in a completely unrelated struct or class.
> 
> I think it's equally silly to require that a user type out the fully
> qualified path to a uniquely named variable in a system where it's
> not likely that there will be a name conflict.

Suppose you type a~~c but the path it uses isn't the one you expected?

In my own code, very long dotted sequences are not that common, the 
longest are probably 4 or 5 names. And those tend to have multiple paths 
and/or involve recursive structs.

So the conditions to be able to use ~~ effectively are going to be rare.

There is one common use-case where such a shorthand would be 
unambiguous, and could save some typing, but there are only three names, 
so it would only save the middle name [a->objptr->length becomes a~~length].

But then that hides what is happening. When I do a lot of work with such 
terms, then I might store a->objptr into an intermediate and work with 
that (p->length). That could be more efficient.

Using a~~length, I lose sight of the fact that there are these extra 
indirections, and also a~~length and a->ptr appear to be of the same 
rank, as do a~~length and b->length, although a and b must be very 
different types.

So I still think this is more usefully employed in an external tool.

-- 
bart

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Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-19 21:31 -0500
  Re: Shorthand ~> pointers bitrex <user@example.net> - 2018-12-20 03:29 -0500
    Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 06:40 -0500
  Re: Shorthand ~> pointers Andrew Smallshaw <andrews@sdf.org> - 2018-12-20 10:23 +0000
    Re: Shorthand ~> pointers Bart <bc@freeuk.com> - 2018-12-20 11:15 +0000
      Re: Shorthand ~> pointers David Brown <david.brown@hesbynett.no> - 2018-12-20 13:46 +0100
        Re: Shorthand ~> pointers mark.bluemel@gmail.com - 2018-12-20 05:04 -0800
          Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 05:11 -0800
    Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 03:25 -0800
    Re: Shorthand ~> pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-12-20 11:51 +0000
      Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 06:54 -0500
        Re: Shorthand ~> pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-12-20 12:17 +0000
          Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 07:21 -0500
            Re: Shorthand ~> pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-12-20 14:18 +0000
              Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 09:26 -0500
          Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 04:29 -0800
            Re: Shorthand ~> pointers mark.bluemel@gmail.com - 2018-12-20 04:46 -0800
            Re: Shorthand ~> pointers David Brown <david.brown@hesbynett.no> - 2018-12-20 15:00 +0100
      Re: Shorthand ~> pointers scott@slp53.sl.home (Scott Lurndal) - 2018-12-20 14:26 +0000
        Re: Shorthand ~> pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-12-20 15:03 +0000
        Re: Shorthand ~> pointers James Kuyper <jameskuyper@alumni.caltech.edu> - 2018-12-20 07:05 -0800
  Re: Shorthand ~> pointers "Fred.Zwarts" <F.Zwarts@KVI.nl> - 2018-12-20 11:16 +0100
    Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 07:16 -0500
  Re: Shorthand ~> pointers Bart <bc@freeuk.com> - 2018-12-20 12:39 +0000
    Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 08:20 -0500
      Re: Shorthand ~> pointers Bart <bc@freeuk.com> - 2018-12-20 14:02 +0000
        Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-20 09:15 -0500
          Re: Shorthand ~> pointers Bart <bc@freeuk.com> - 2018-12-20 17:48 +0000
    Re: Shorthand ~> pointers Juha Nieminen <nospam@thanks.invalid> - 2018-12-21 11:36 +0000
      Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-21 08:05 -0500
        Re: Shorthand ~> pointers scott@slp53.sl.home (Scott Lurndal) - 2018-12-21 14:56 +0000
          Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-21 10:03 -0500
            Re: Shorthand ~> pointers scott@slp53.sl.home (Scott Lurndal) - 2018-12-21 15:35 +0000
              Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-21 10:41 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-21 15:41 +0000
                Re: Shorthand ~> pointers scott@slp53.sl.home (Scott Lurndal) - 2018-12-21 17:04 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-21 12:23 -0500
        Re: Shorthand ~> pointers scott@slp53.sl.home (Scott Lurndal) - 2018-12-21 14:57 +0000
          Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-21 10:20 -0500
            Re: Shorthand ~> pointers scott@slp53.sl.home (Scott Lurndal) - 2018-12-21 15:37 +0000
              Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-21 10:42 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-21 15:42 +0000
                Re: Shorthand ~> pointers David Brown <david.brown@hesbynett.no> - 2018-12-21 17:39 +0100
                Re: Shorthand ~> pointers scott@slp53.sl.home (Scott Lurndal) - 2018-12-21 17:05 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-21 12:24 -0500
                Re: Shorthand ~> pointers "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-21 23:49 -0800
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-22 13:05 -0500
                Re: Shorthand ~> pointers "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-22 16:38 -0800
        Re: Shorthand ~> pointers Juha Nieminen <nospam@thanks.invalid> - 2018-12-22 18:39 +0000
          Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-22 13:42 -0500
            Re: Shorthand ~> pointers "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-22 16:23 -0800
              Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-22 21:52 -0500
                Re: Shorthand ~> pointers "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-22 20:26 -0800
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-22 23:54 -0500
                Re: Shorthand ~> pointers Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-12-23 12:43 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 08:34 -0500
                Re: Shorthand ~> pointers James Kuyper <jameskuyper@alumni.caltech.edu> - 2018-12-23 08:09 -0800
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 11:56 -0500
            Re: Shorthand ~> pointers Juha Nieminen <nospam@thanks.invalid> - 2018-12-23 08:24 +0000
              Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 08:24 -0500
                Re: Shorthand ~> pointers Bart <bc@freeuk.com> - 2018-12-23 15:28 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 12:15 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-23 17:24 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 12:35 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-23 17:39 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 14:07 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-23 19:17 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 14:52 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-23 21:14 +0000
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-23 21:36 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 19:24 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-24 10:14 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-24 07:53 -0500
                Re: Shorthand ~> pointers gazelle@shell.xmission.com (Kenny McCormack) - 2018-12-24 14:16 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-24 10:17 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-24 15:36 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-24 10:43 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-24 15:46 +0000
                Re: Shorthand ~> pointers "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-24 14:16 -0800
                Re: Shorthand ~> pointers Melzzzzz <Melzzzzz@zzzzz.com> - 2018-12-24 22:36 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-24 18:35 -0500
                Re: Shorthand ~> pointers "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-24 15:44 -0800
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-24 18:55 -0500
                Re: Shorthand ~> pointers "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-25 22:20 -0800
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-26 05:32 -0500
                You are so full of shit (Was: Shorthand ~> pointers) gazelle@shell.xmission.com (Kenny McCormack) - 2018-12-26 14:10 +0000
                Re: You are so full of .. (Was: Shorthand ~> pointers) "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-26 09:47 -0500
                Re: You are so full of shit (Was: Shorthand ~> pointers) gazelle@shell.xmission.com (Kenny McCormack) - 2018-12-26 15:21 +0000
                Re: Shorthand ~> pointers Ian Collins <ian-news@hotmail.com> - 2018-12-24 08:26 +1300
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 15:02 -0500
                Re: Shorthand ~> pointers Tim Rentsch <txr@alumni.caltech.edu> - 2018-12-28 08:21 -0800
                Re: Shorthand ~> pointers nobody@example.org (Scott) - 2018-12-25 03:56 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-24 23:55 -0500
                Re: Shorthand ~> pointers Richard Damon <Richard@Damon-Family.org> - 2018-12-25 10:14 -0500
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-25 10:36 -0500
                Re: Shorthand ~> pointers Juha Nieminen <nospam@thanks.invalid> - 2018-12-24 14:22 +0000
                Re: Shorthand ~> pointers "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-24 15:47 -0800
            Re: Shorthand ~> pointers Reinhardt Behm <rbehm@hushmail.com> - 2018-12-23 16:31 +0800
              Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 08:28 -0500
  Re: Shorthand ~> pointers nobody@example.org (Scott) - 2018-12-21 01:14 +0000
    Re: Shorthand ~> pointers "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2018-12-21 03:23 +0100
      Re: Shorthand ~> pointers nobody@example.org (Scott) - 2018-12-21 09:45 +0000
        Re: Shorthand ~> pointers David Brown <david.brown@hesbynett.no> - 2018-12-21 12:05 +0100
        Re: Shorthand ~> pointers Vir Campestris <vir.campestris@invalid.invalid> - 2018-12-21 21:24 +0000
          Re: Shorthand ~> pointers scott@slp53.sl.home (Scott Lurndal) - 2018-12-21 21:47 +0000
          Re: Shorthand ~> pointers David Brown <david.brown@hesbynett.no> - 2018-12-22 16:09 +0100
            Re: Shorthand ~> pointers Richard Damon <Richard@Damon-Family.org> - 2018-12-22 11:49 -0500
              Re: Shorthand ~> pointers Bart <bc@freeuk.com> - 2018-12-22 18:41 +0000
                Re: Shorthand ~> pointers Anton Shepelev <anton.txt@gmail.com> - 2018-12-22 21:48 +0300
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-22 14:00 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-22 19:08 +0000
                Re: Shorthand ~> pointers fir <profesor.fir@gmail.com> - 2018-12-22 16:42 -0800
                Re: Shorthand ~> pointers Richard Damon <Richard@Damon-Family.org> - 2018-12-22 17:10 -0500
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-22 17:42 -0500
                Re: Shorthand ~> pointers Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2018-12-23 10:19 +0000
                Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-23 08:40 -0500
              Re: Shorthand ~> pointers Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-12-25 21:00 +0000
    Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-21 07:57 -0500
  Re: Shorthand ~> pointers Bonita Montero <Bonita.Montero@gmail.com> - 2018-12-24 14:38 +0100
    Re: Shorthand ~> pointers "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-24 10:26 -0500
      Re: Shorthand ~> pointers Bonita Montero <Bonita.Montero@gmail.com> - 2018-12-28 13:35 +0100

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