I think example in subject reference page has a typo: BOOST_MPL_HAS_XXX_TRAIT_DEF(has_xxx) should be BOOST_MPL_HAS_XXX_TRAIT_DEF(xxx) Also: Does anyone know any workaround to make it work for Sunpro 5.3 compiler? Specifically I need to detect that particular method is the member of the template argument class. Gennadiy