Re: A bug in boost.lexical_cast 1.30

From: Black Ice (yg-boost-users_at_[hidden])
Date: 2003-03-30 22:50:23

Thanks

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"Terje Sletteb?" <tslettebo_at_[hidden]> wrote in message
news:03d401c2f596$be6d2a40$8d6c6f50_at_pc...
> >From: "Black Ice" <yg-boost-users_at_[hidden]>
>
> > When lexical_cast used under VC, and the option "Treat wchar_t as
Build-in
> > Type" is off
> > The following code will cause compile error:
> > int main(int argc, char * argv[])
> > {
> >  string str("10");
> >  unsigned short n = lexical_cast<unsigned short>(str);
> >  return 0;
> > }
> >
> > Because in lexical_cast::detail::widest_char, treat unsigned short as
> > wchar_t!!
>
> I have tested it, and can confirm this problem. The problem is that
> lexical_cast doesn't disable wide character support in this case. It seems
> it needs to test for BOOST_NO_INTRINSIC_WCHAR_T, after all, as it did
> earlier. In other words, change this:
>
> #if defined(BOOST_NO_STRINGSTREAM) || \
> defined(BOOST_NO_STD_WSTRING) || \
> defined(BOOST_NO_STD_LOCALE) || \
> defined(BOOST_NO_CWCHAR) || \
> defined(BOOST_MSVC) && (BOOST_MSVC <= 1200)
> #define DISABLE_WIDE_CHAR_SUPPORT
> #endif
>
> to this:
>
> #if defined(BOOST_NO_STRINGSTREAM) || \
> defined(BOOST_NO_STD_WSTRING) || \
> defined(BOOST_NO_STD_LOCALE) || \
> defined(BOOST_NO_INTRINSIC_WCHAR_T)
> #define DISABLE_WIDE_CHAR_SUPPORT
> #endif
>
> and remove this:
>
> #ifdef BOOST_NO_INTRINSIC_WCHAR_T
> #include <cwchar>
> #endif
>
> If this is done, it works, both for the option on or off.
>
> This also disables wide character support on Intel C++, even though it
> handles it, as it doesn't set _NATIVE_WCHAR_T_DEFINED, even when intrinsic
> wchar_t is turned on. However, this is really an issue in the detection on
> Intel C++, rather than with lexical_cast.
>
>
> Regards,
>
> Terje
>
>
>
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