On Thu, Mar 29, 2012 at 6:39 AM, Rob Desbois
I'm unable to use the reentrant macros for iteration currently..I think I'm probably misunderstanding their usage, and a push in the right direction would be much appreciated.
My need is to iterate through a sequence, then iterate through a sequence nested within each element. As I understand, I should be able to call (e.g.): * BOOST_PP_SEQ_FOR_EACH(OP, data, seq) to iterate through the outer sequence * then in OP(r, data, elem) call BOOST_PP_SEQ_FOR_EACH_R(r, OP2, data, elem)
[...] Just to add to Paul's reply, no, this isn't going to work, as you've discovered, due to your attempt to expand SEQ_FOR_EACH_R within an expansion of SEQ_FOR_EACH_R. I ran into this inconvenience at some point, too, and simply wrote up a script to define a collection of macros similar to SEQ_FOR_EACH and SEQ_TRANSFORM that were reentrant (so they used token-pasting with an pp integral constant). It's fun exercise, but if you're not into writing it yourself, I'd be happy to point you to the code. - Jeff