"Loïc Joly" wrote in message news:ebd5k9$18p$1@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