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Groups > comp.lang.c++.moderated > #1413

Re: codecvt problem

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Martin Bonner wrote, On 8.6.2011 10:06:
> 
> On Jun 6, 10:31 pm, Vaclav Haisman <v.hais...@sh.cvut.cz> wrote:
>> Jeff Flinn wrote, On 6.6.2011 20:50:> Vaclav Haisman wrote:
>>>> Rafał Moniuszko wrote, On 5.6.2011 15:25:
>>>> [...]
>>>>> ==9451== Conditional jump or move depends on uninitialised value(s)
>>>> I think that this is likely because of uninitialized mystate variable. Add
>>>> #include <cstring> and do std::memset (&mystate, 0, sizeof(mystate));:
>> 
>>> Why not mbstate_t mystate = {0};
>> 
>> Because the last time I tried that I got a warning about bad/wrong
>> initializer in case of mbstate_t being an int.
> 
> But memset produces undefined behaviour if mbstate_t is (for example)
> void *.  I /think/ the only way to fix this is something like:
Why does it produce undefined behaviour? You can always take address of a
void pointer and zero the pointer.

> 
> namespace { mbstate_t zerostate; }
> int main () { mbstate_t mystate = zerostate;...}
> 
> But that's an awful faf.
That would be usable. Ideal would be if we had some
std::mbstate_init(mbstate_t &) function or similar.

-- 
VH



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Thread

codecvt problem  Rafał Moniuszko <rafal.lists@gmail.com> - 2011-06-05 07:25 -0600
  Re: codecvt problem Vaclav Haisman <v.haisman@sh.cvut.cz> - 2011-06-05 21:41 -0600
    Re: codecvt problem  Jeff Flinn <TriumphSprint2000@hotmail.com> - 2011-06-06 12:50 -0600
      Re: codecvt problem Vaclav Haisman <v.haisman@sh.cvut.cz> - 2011-06-06 15:31 -0600
        Re: codecvt problem  Martin Bonner <martinfrompi@yahoo.co.uk> - 2011-06-08 02:06 -0600
          Re: codecvt problem  Vaclav Haisman <v.haisman@sh.cvut.cz> - 2011-06-08 17:24 -0600
            Re: codecvt problem  Seungbeom Kim <musiphil@bawi.org> - 2011-06-09 07:02 -0600
              Re: codecvt problem Vaclav Haisman <v.haisman@sh.cvut.cz> - 2011-06-16 17:04 -0600
                Re: codecvt problem Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2011-06-17 06:42 -0600
                Re: codecvt problem Seungbeom Kim <musiphil@bawi.org> - 2011-06-18 07:38 -0600
                Re: codecvt problem Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2011-06-20 13:16 -0600
                Re: codecvt problem Seungbeom Kim <musiphil@bawi.org> - 2011-06-23 14:42 -0600
        Re: codecvt problem  Seungbeom Kim <musiphil@bawi.org> - 2011-06-09 07:01 -0600
      Re: codecvt problem Daniel Krügler <daniel.kruegler@googlemail.com> - 2011-06-06 15:31 -0600
        Re: codecvt problem Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2011-06-07 03:07 -0600
          Re: codecvt problem  Daniel Krügler <daniel.kruegler@googlemail.com> - 2011-06-07 10:31 -0600
  Re: codecvt problem  Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2011-06-06 12:47 -0600

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