Larry Evans wrote:
On 04/04/2007 02:18 AM, Eric Niebler wrote:
As discussed here recently, Boost.Proto is an expression template (ET) framework for building domain-specific embedded languages (DSEL). The purpose of this preliminary submission is to solicit feedback prior to a full submission (and to buy myself a little time to polish the docs/tests/examples :-).
Proto uses or_ and and_ for alternatives and sequences. It seems that alt_ and seq_ would be closer to the spirit names. Any reason why those names were preferred over alt_ and seq_?
Because for what they do, or_ and and_ are the right names. :-) You realize that these do not create expression templates, right? They are part of proto's meta-grammar facility. If you want to know if an expression type E matches grammar G1 or G2, you use: proto::matches<E, proto::or_<G1, G2> > That's a compile-time boolean test. Proto::and_ behaves similarly. Like mpl::or_ and mpl::and_ (and like || and &&) these do short-circuit evaluation. HTH, -- Eric Niebler Boost Consulting www.boost-consulting.com