I need help with unconfirmed 49269: is there a workaround?

[Bo Persson]

Michael Kochetkov wrote:

> Hello,
> I believe I have found the defect in libstdc++:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49269 but it is still
> unconfirmed within several weeks. So I wonder if one could help me
> with a workaround for the problem?
> The sample program prints "Current position: 1" for gcc and
> libstdc++ that prevents the subsequent program normal working and
> VC with Dinkumware prints "Current position: 2" and that is what I
> expect. It seems that after reading one wchar_t symbol the tellg
> function that returns position in bytes shall return 2. What do you
> think?
>
> Thank you in advance,

Like Paolo Carlini says in the bug report, this is very much 
implementation defined behavior. This means that even though two 
implementations give you different results, they can very well both be 
correct according to the standard.

The way do_always_noconv() returns true, while do_encoding() returns 
2, seems a bit inconsistent to me. If you need 2 external units to 
form 1 internal unit, it looks like a conversion to me.


Bo Persson