[boost] wave use to clarify PP usage

From: Larry Evans (cppljevans_at_[hidden])
Date: 2005-02-14 15:57:25

Does anyone have a tool that would clarify what's
happening with some PP macros in, for example:

   boost/spirit/fusion/sequence/tuple.hpp

For example, could wave be used to sort-of trace through
the macro expansions to make the code easier to understand.

For instance, I'm guessing that:

         BOOST_PP_REPEAT_FROM_TO(
             2, FUSION_MAX_TUPLE_SIZE, FUSION_TUPLE_CONSTRUCTOR, _)

does for 2 to FUSION_MAX_TUPLE_SIZE what:

      explicit tuple(typename detail::call_param<T0>::type _0)
             : base_type(_0) {}

Does for a 1 argument CTOR.  I could run it through cpp, but if there
are several nested macro calls, it probably wouldn't help much in
understand what's going on.

TIA.