I can't seem to get BOOST_CHECK_EQUAL with std::type_info instances to compile with g++, version (GCC) 4.1.2 20070925 (Red Hat 4.1.2-33) Here's a simple test case: ------------------ #include <iostream> #include <typeinfo> #define BOOST_TEST_MAIN #include <boost/test/included/unit_test.hpp> std::ostream & operator<<(std::ostream &out, const std::type_info &info) { return out << info.name(); } BOOST_AUTO_TEST_CASE(Foo) { std::cout << "Typeid of int is " << typeid(int) << "\n"; BOOST_CHECK_EQUAL(typeid(int), typeid(float)); } ------------------ g++ complains that there isn't an operator<< for type_info in the BOOST_CHECK_EQUAL, even though it is used just fine on the previous line. Output: g++ -o ti ti.cpp /usr/include/boost/test/test_tools.hpp: In member function ‘void boost::test_tools::tt_detail::print_log_value<T>::operator()(std::ostream&, const T&) [with T = std::type_info]’: /usr/include/boost/test/test_tools.hpp:404: instantiated from ‘std::ostream& boost::test_tools::tt_detail::operator<<(std::ostream&, const boost::test_tools::tt_detail::print_helper_t<T>&) [with T = std::type_info]’ /usr/include/boost/test/utils/wrap_stringstream.hpp:66: instantiated from ‘boost::basic_wrap_stringstream<CharT>& boost::operator<<(boost::basic_wrap_stringstream<CharT>&, const T&) [with CharT = char, T = boost::test_tools::tt_detail::print_helper_t<std::type_info>]’ /usr/include/boost/test/test_tools.hpp:460: instantiated from ‘void boost::test_tools::tt_detail::check_frwd(Pred, boost::wrap_stringstream&, boost::test_tools::const_string, size_t, boost::test_tools::tt_detail::tool_level, boost::test_tools::tt_detail::check_type, const Arg0&, const char*, const Arg1&, const char*) [with Pred = boost::test_tools::tt_detail::equal_impl_frwd, Arg0 = std::type_info, Arg1 = std::type_info]’ ti.cpp:14: instantiated from here /usr/include/boost/test/test_tools.hpp:298: error: no match for ‘operator<<’ in ‘ostr << t’ <List of candidates removed, but type_info isn't one of them> Anyone know why this is? -- Paul S. Strauss pss@acm.org