Re: [Boost-users] [Proto] Recreating an expression

Here's a little extra feedback that I forgot include in my first reply. christophe henry wrote:

These terminals are used with a simple grammar: struct BuildGuards : proto::or_< proto::when< proto::logical_or,

GuardOR() >, proto::when< proto::logical_and,

GuardAND() >, proto::when< proto::logical_not<BuildGuards >, GuardNOT()

Use proto::_child instead of proto::_value here. proto::_value returns the value of a terminal node. proto::_child returns the child of a unary expression tree node. It's really just luck that this is working for you.

>, proto::when < proto::terminal, proto::_()

I would use proto::_ here instead of proto::_(). They mean the same thing, but proto::_ is more idiomatic. See the following section for an explanation of why proto::_ and proto::_() are equivalent when used as transforms: http://www.boost.org/doc/libs/1_39_0/doc/html/proto/users_guide.html#boost_p... -- Eric Niebler BoostPro Computing http://www.boostpro.com