Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c++ > #9150

Re: Length of C++ arrays allocated by operator new[]

Show key headers only | View raw

On 08/22/11 12:14 PM, Leigh Johnston wrote:
> On 22/08/2011 00:38, Ian Collins wrote:
>> On 08/22/11 11:04 AM, Leigh Johnston wrote:
>>> On 21/08/2011 23:01, Marcel Müller wrote:
>>>> On 21.08.11 23.32, Leigh Johnston wrote:
>>>>>
>>>>> Template code bloat is mostly over stated; non-template classes with
>>>>> lots of inline functions can have similar "bloat".
>>>>
>>>> That's not what I mean. The most bloat comes from different
>>>> instantiations of template classes that in fact produce binary the same
>>>> code. E.g. std::vector will most likely result in identical code for all
>>>> pointer types (except for member function pointers, of course).
>>>>
>>>> At least I have not seen a compiler that can share code between
>>>> different template instantiations.
>>>
>>> That is the price you pay for not having to lose type information
>>> however you can have a std::vector<void*>  if you want. Template bloat
>>> is less of a concern these days due to increased memory and storage
>>> capacities even on smaller devices such as mobile phones.
>>
>> You don't even gave to loose type safety if you specialise vector for
>> void* and derive privately from there.
>
> Indeed but pointers are not always the answer; the convenience and
> possible performance characteristics of using a container as a container
> of value type tend to outweigh concerns of code bloat these days IMHO
> (assuming I am not writing code for a £20 toaster).

The £20 toaster is an interesting example.  At least one embedded tool 
chain I've used (Green Hills) when optimising for space will fold 
duplicate machine instructions into calls  Thus all vectors of pointer 
type will generate the same machine code which gets merged.  So the 
specialisation trick is unnecessary!

-- 
Ian Collins

Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Length of C++ arrays allocated by operator new[] Marcel Müller <news.5.maazl@spamgourmet.org> - 2011-08-20 15:01 +0200
  Re: Length of C++ arrays allocated by operator new[] Richard Damon <richard@damon-family.org> - 2011-08-20 11:39 -0400
    Re: Length of C++ arrays allocated by operator new[] Marcel Müller <news.5.maazl@spamgourmet.org> - 2011-08-21 22:15 +0200
      Re: Length of C++ arrays allocated by operator new[] Richard Damon <richard@damon-family.org> - 2011-08-22 12:56 -0400
        Re: Length of C++ arrays allocated by operator new[] Marcel Müller <news.5.maazl@spamgourmet.com> - 2011-08-22 22:41 +0200
  Re: Length of C++ arrays allocated by operator new[] Paul <pchristor@yahoo.co.uk> - 2011-08-20 09:20 -0700
    Re: Length of C++ arrays allocated by operator new[] Paul <pchristor@yahoo.co.uk> - 2011-08-20 10:38 -0700
      Re: Length of C++ arrays allocated by operator new[] ruben safir <ruben@mrbrklyn.com> - 2011-08-21 22:33 -0400
        Re: Length of C++ arrays allocated by operator new[] Paul <pchristor@yahoo.co.uk> - 2011-08-22 03:05 -0700
          Re: Length of C++ arrays allocated by operator new[] ruben safir <ruben@mrbrklyn.com> - 2011-08-22 20:05 -0400
            Re: Length of C++ arrays allocated by operator new[] Paul <pchristor@yahoo.co.uk> - 2011-08-22 17:20 -0700
            Re: Length of C++ arrays allocated by operator new[] Paul Brettschneider <paul.brettschneider@yahoo.fr> - 2011-08-23 08:18 +0200
            Re: Length of C++ arrays allocated by operator new[] James Kanze <james.kanze@gmail.com> - 2011-08-26 08:29 -0700
              Re: Length of C++ arrays allocated by operator new[] Noah Roberts <roberts.noah@gmail.com> - 2011-08-26 09:06 -0700
    Re: Length of C++ arrays allocated by operator new[] Juha Nieminen <nospam@thanks.invalid> - 2011-08-20 17:55 +0000
      Re: Length of C++ arrays allocated by operator new[] Paul <pchristor@yahoo.co.uk> - 2011-08-20 10:59 -0700
      Re: Length of C++ arrays allocated by operator new[] legalize+jeeves@mail.xmission.com (Richard) - 2011-08-21 03:07 +0000
  Re: Length of C++ arrays allocated by operator new[] "A" <a@a.a> - 2011-08-20 18:26 +0200
    Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-20 17:36 +0100
      Re: Length of C++ arrays allocated by operator new[] Marcel Müller <news.5.maazl@spamgourmet.org> - 2011-08-21 22:39 +0200
        Re: Length of C++ arrays allocated by operator new[] Ian Collins <ian-news@hotmail.com> - 2011-08-22 09:08 +1200
        Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-21 22:32 +0100
          Re: Length of C++ arrays allocated by operator new[] Marcel Müller <news.5.maazl@spamgourmet.org> - 2011-08-22 00:01 +0200
            Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-22 00:04 +0100
              Re: Length of C++ arrays allocated by operator new[] Ian Collins <ian-news@hotmail.com> - 2011-08-22 11:38 +1200
                Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-22 01:14 +0100
                Re: Length of C++ arrays allocated by operator new[] Ian Collins <ian-news@hotmail.com> - 2011-08-22 12:27 +1200
              Re: Length of C++ arrays allocated by operator new[] Paul <pchristor@yahoo.co.uk> - 2011-08-21 17:34 -0700
                Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-22 01:39 +0100
                Re: Length of C++ arrays allocated by operator new[] Paul <pchristor@yahoo.co.uk> - 2011-08-21 18:13 -0700
                Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-22 12:16 +0100
                Re: Length of C++ arrays allocated by operator new[] Paul <pchristor@yahoo.co.uk> - 2011-08-22 09:09 -0700
                Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-22 17:22 +0100
                Re: Length of C++ arrays allocated by operator new[] Oliver Jackson <chexmofo@hotmail.com> - 2011-08-22 22:50 -0700
              Re: Length of C++ arrays allocated by operator new[] Juha Nieminen <nospam@thanks.invalid> - 2011-08-22 06:10 +0000
                Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-22 12:20 +0100
                Re: Length of C++ arrays allocated by operator new[] Noah Roberts <roberts.noah@gmail.com> - 2011-08-26 09:03 -0700
                Re: Length of C++ arrays allocated by operator new[] Nobody <nobody@nowhere.com> - 2011-08-27 02:05 +0100
          Re: Length of C++ arrays allocated by operator new[] Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-08-22 02:06 -0700
        Re: Length of C++ arrays allocated by operator new[] Juha Nieminen <nospam@thanks.invalid> - 2011-08-22 06:06 +0000
          Re: Length of C++ arrays allocated by operator new[] Marcel Müller <news.5.maazl@spamgourmet.com> - 2011-08-22 09:19 +0200
            Re: Length of C++ arrays allocated by operator new[] Goran <goran.pusic@gmail.com> - 2011-08-22 04:50 -0700
            Re: Length of C++ arrays allocated by operator new[] Juha Nieminen <nospam@thanks.invalid> - 2011-08-22 13:53 +0000
              Re: Length of C++ arrays allocated by operator new[] yatremblay@bel1lin202.(none) (Yannick Tremblay) - 2011-08-23 09:40 +0000
                Re: Length of C++ arrays allocated by operator new[] Juha Nieminen <nospam@thanks.invalid> - 2011-08-23 10:03 +0000
        Re: Length of C++ arrays allocated by operator new[] yatremblay@bel1lin202.(none) (Yannick Tremblay) - 2011-08-22 11:26 +0000
          Re: Length of C++ arrays allocated by operator new[] Marcel Müller <news.5.maazl@spamgourmet.com> - 2011-08-22 22:32 +0200
      Re: Length of C++ arrays allocated by operator new[] Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 13:30 -0700
        Re: Length of C++ arrays allocated by operator new[] Leigh Johnston <leigh@i42.co.uk> - 2011-08-27 22:23 +0100
  Re: Length of C++ arrays allocated by operator new[] Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-08-22 02:14 -0700
  Re: Length of C++ arrays allocated by operator new[] Gerald Breuer <Gerald.Breuer@Use-Author-Supplied-Address.invalid> - 2011-08-27 22:35 +0200
    Re: Length of C++ arrays allocated by operator new[] Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 15:45 -0700
      Re: Length of C++ arrays allocated by operator new[] Paavo Helde <myfirstname@osa.pri.ee> - 2011-08-28 02:00 -0500
    Re: Length of C++ arrays allocated by operator new[] "Bo Persson" <bop@gmb.dk> - 2011-08-28 16:38 +0200
      Re: Length of C++ arrays allocated by operator new[] Gerald Breuer <Gerald.Breuer@Use-Author-Supplied-Address.invalid> - 2011-08-28 16:49 +0200
        Re: Length of C++ arrays allocated by operator new[] "Bo Persson" <bop@gmb.dk> - 2011-08-28 22:44 +0200
          Re: Length of C++ arrays allocated by operator new[] Gerald Breuer <Gerald.Breuer@Use-Author-Supplied-Address.invalid> - 2011-08-28 23:03 +0200
        Re: Length of C++ arrays allocated by operator new[] James Kanze <james.kanze@gmail.com> - 2011-08-29 04:05 -0700

csiph-web