Re: [Boost-users] BOOST_CHECK_EQUAL and std::wstring

From: Gennadiy Rozental (gennadiy.rozental_at_[hidden])
Date: 2006-08-11 13:15:26

> "Loïc Joly" <loic.joly_at_[hidden]> wrote in message 
> news:ebd5k9$18p$1_at_sea.gmane.org...
> Rob Caldecott a écrit :
> > I am using the Boost unit test suite for the first time, but am having a
> > problem using BOOST_CHECK_EQUAL with wide strings.  For example:
> >
> >     std::wstring str1 = L"unit";
> >
> >     std::wstring str2 = L"test";
> >
> >     BOOST_CHECK_EQUAL(str1, str2);
> >
> > This produces the following error:
> >
> > c:\boost\include\boost-1_33_1\boost\test\test_tools.hpp(274) : error 
> > C2679:
> > binary '<<' : no operator found which takes a right-hand operand of type
> > 'const std::wstring' (or there is no acceptable conversion)
>
> Boost::test may want to display the values of those wide strings on a
> narrow stream if the test fails, thus your error.
>
> Try adding something like
>
> namespace std {
> inline std::ostream& operator<<(std::ostream& out, const std::wstring&
> value)
> {
>      out << ConvertWstringToString(value);
>      return out;
> }
>
> }

This sound about right. I plan to revisit wide strings/streams support next 
release to allow users to select at compile time what kind of character type 
to use throughout the framework.

Gennadiy