Somewhere in the E.U., le 17/02/2005 Bonjour It looks as though the Boost.Test doc has a slight sync issue. The BOOST_CHECK_PREDICATE macro is described (in file boost/libs/test/doc/components/test_tools/reference/index.html) as having to be used thus: 8>< ------------------------------------------- ><8 int test.cpp( int, char* [] ) { int i = 17; BOOST_CHECK_PREDICATE( std::not_equal_to<int>(), 2, (i,17) ); // ^^^^^^^^^^ return 0; } 8>< ------------------------------------------- ><8 whereas Boost.Test's test uses (in file boost/libs/test/test/test_tools_test.cpp) the following form: 8>< ------------------------------------------- ><8 using std::not_equal_to; CHECK_TOOL_USAGE( BOOST_CHECK_PREDICATE( not_equal_to<int>(), (i)(17) ), // ^^^^^^^^^ output.is_equal( CHECK_PATTERN( "error in " TEST_CASE_NAME ": test not_equal_to<int>()( i, 17 ) failed for ( 17, 17 )\n", 2 ) ) 8>< ------------------------------------------- ><8 Of course the later compiles while the former does not. Merci Hubert Holin