[Boost-users] [pre-processor ] help needed

Hello *, I have some pre-processor sequence in form of: (X1) (X2) (X3) (X4) which is expanded by BOOST_PP_SEQ_FOR_EACH to template parameters: some_template ... My problem now is that some of Xn parameters can be a template instantiation and that actually causes PP to think, that there are more parameters to the function applied by ..._SEQ_FOR_EACH. Example: some_other_template cause preprocessor to think that there are 2 params some_other_template<T1 and T2>. Putting the parameter into additional braces like ((X4)) results in the template: some_template and that results in a compiler error. I know this construct can switch off ADL, but I don't know why it result here in a compiler error, since I fully qualify the X4 (from which namespace it is). Is there any way to treat Xn as a single paramer but during the final pre-processing stage get rid of additional braces? Many thanks, Ovanes