[Boost-users] [Proto] How to access the grammar of an expression?

Subject: [Boost-users] [Proto] How to access the grammar of an expression?
From: Roland Bock (rbock_at_[hidden])
Date: 2010-09-24 08:33:11

Hi,

ist there a way to access the grammar that was used to construct an 
expression?

I have defined a metafunction

template<class Left, class Right>
struct grammar_less: mpl::false_ {};

which has specialization for some grammar combinations.

Now I want to define a function that can take two arguments so that

child0.grammar < child1.grammar

Any idea how to do that? My test-code is attached.

Regards,

Roland