-----Original Message----- From: boost-bounces@lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Eric Niebler
I have a preprocessing task that exceeds my limited abilities. If any PP gurus want to step in and prevent me from hurting myself further, I would be very grateful.
My problem is this: I want to mpl::and_ together a bunch of predicates. mpl::and_ has a limit of 4 arguments. So this is wrong:
mpl::and_< pred1, pred2, pred3, pred4, pred5 >
but this is ok:
mpl::and_< pred1, pred2, pred3, mpl::and_< pred4, pred5 > >
The challenge, should you choose to accept it, is to write some PP magic that, given a MAKE_PREDICATE(z, n, data) macro and a max arity (which is greater than 4!), generates a properly nested mpl::and_-ing of the predicates.
Do you have a sequence (i.e. a selection) of predicates already or are they all "pred1", "pred2", etc.? Regards, Paul Mensonides