[Boost-users] Why is size param required for BOOST_PP_TUPLE_TO_LIST(size, tuple) ?

Hi there, I am looking at: http://www.boost.org/doc/libs/1_39_0/libs/preprocessor/doc/ref/tuple_to_list... Just ouf of curiosity why is size required ? Can't the number of argument be deduced using the preprocessor ? Eg.: http://groups.google.com/group/comp.std.c/browse_thread/thread/77ee8c8f92e4a... Thanks, -- Mathieu