Re: removing constness of a true const

From	Victor Bazarov <v.bazarov@comcast.invalid>
Newsgroups	comp.lang.c++
Subject	Re: removing constness of a true const
Date	2011-07-15 08:17 -0400
Organization	A noiseless patient Spider
Message-ID	<ivpb50$grt$1@dont-email.me> (permalink)
References	<1e55c267-2789-498c-a5a1-f56e499336e5@z12g2000yqj.googlegroups.com> <ivn3hs$tk2$1@dont-email.me> <ce8312c9-10ef-46d5-a2bc-0c267526dbd3@a11g2000yqm.googlegroups.com> <ivnivf$a1l$1@dont-email.me> <ivntgo$4eq$1@news.ett.com.ua>

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On 7/14/2011 7:18 PM, Balog Pal wrote:
>
> "Victor Bazarov" <v.bazarov@comcast.invalid>
>
>> Class objects are never truly const.
>
> How so? You say
>
> const std::pair<int, int> foo = std::make_pair(1,2);
>
> is any less const than two separate ints? Or that overwriting them is
> less UB?
>
> I'd be very disappointed if today's compilers would not put that pair in
> the 'const' segment and fiddling with it would not cause a crash.

Any data initializing which requires code to be executed at runtime 
cannot be put in "the 'const' segment" - the segment would not be const, 
would it?

>
> Doing the same with std::string is possibly trickier, but if the
> compiler substitutes strlen("foo") with 3 at compile, it could create
> const string with its supposed state placeable in const data too, if the
> writers put some work in.
>

V
-- 
I do not respond to top-posted replies, please don't ask

Thread

removing constness of a true const siddhu <siddharth.sng@gmail.com> - 2011-07-14 08:07 -0700
  Re: removing constness of a true const Victor Bazarov <v.bazarov@comcast.invalid> - 2011-07-14 11:55 -0400
    Re: removing constness of a true const siddhu <siddharth.sng@gmail.com> - 2011-07-14 09:25 -0700
      Re: removing constness of a true const Victor Bazarov <v.bazarov@comcast.invalid> - 2011-07-14 16:18 -0400
        Re: removing constness of a true const "Balog Pal" <pasa@lib.hu> - 2011-07-15 01:18 +0200
          Re: removing constness of a true const Victor Bazarov <v.bazarov@comcast.invalid> - 2011-07-15 08:17 -0400
            Re: removing constness of a true const "Balog Pal" <pasa@lib.hu> - 2011-07-15 18:04 +0200
              Re: removing constness of a true const Ian Collins <ian-news@hotmail.com> - 2011-07-16 08:36 +1200
                Re: removing constness of a true const "Balog Pal" <pasa@lib.hu> - 2011-07-16 02:00 +0200
            Re: removing constness of a true const Paavo Helde <myfirstname@osa.pri.ee> - 2011-07-15 16:08 -0500
              Re: removing constness of a true const Ian Collins <ian-news@hotmail.com> - 2011-07-16 09:30 +1200
  Re: removing constness of a true const "Balog Pal" <pasa@lib.hu> - 2011-07-14 19:05 +0200
    Re: removing constness of a true const siddhu <siddharth.sng@gmail.com> - 2011-07-14 12:05 -0700
      Re: removing constness of a true const "Bo Persson" <bop@gmb.dk> - 2011-07-14 23:33 +0200
        Re: removing constness of a true const Victor Bazarov <v.bazarov@comcast.invalid> - 2011-07-14 17:46 -0400
          Re: removing constness of a true const "Bo Persson" <bop@gmb.dk> - 2011-07-16 08:32 +0200
  Re: removing constness of a true const "Johannes Schaub (litb)" <schaub.johannes@googlemail.com> - 2011-07-15 15:02 +0200
    Re: removing constness of a true const Victor Bazarov <v.bazarov@comcast.invalid> - 2011-07-15 09:54 -0400

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