Hi, I'm not sure if it's an issue or not. But I noticed that the given code does not compile: #define BOOST_TEST_MAIN #include <boost/test/included/unit_test.hpp> template <typename Tp1, typename Tp2> inline Tp2 stupid_cast (const Tp1& arg) { return static_cast<Tp2>(arg); } BOOST_AUTO_TEST_CASE( test_details_key ) { BOOST_CHECK(stupid_cast<float, int>(1.0) == 1); } It give the following error with g++ (GCC) 4.4.3: try.cpp:40:48: error: macro "BOOST_CHECK" passed 2 arguments, but takes just 1 try.cpp: In member function 'void test_details_key::test_method()': try.cpp:40: error: 'BOOST_CHECK' was not declared in this scope While the following does compile (and runs well): #define BOOST_TEST_MAIN #include <boost/test/included/unit_test.hpp> template <typename Tp1, typename Tp2> inline Tp2 stupid_cast (const Tp1& arg) { return static_cast<Tp2>(arg); } BOOST_AUTO_TEST_CASE( test_details_key ) { BOOST_CHECK((stupid_cast<float, int>(1.0) == 1)); // <----- I wrapped it in parenthesis } So I was wondering whether the BOOST_<level> macro (I did check that the others suffer the same problem) are expected to behave in this way, or they are just missing an extra layer of parenthesis around the arguments, or even GCC is at fault, or I'm missing something definitely... Regards, Sylvain