[Boost-users] BOOST_CHECK_EQUAL and std::wstring

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) Any help would be appreciated.