Proto for Boost mailing list page: [proto] Restructuring noses in generator

Subject: [proto] Restructuring noses in generator
From: Joel Falcou (joel.falcou_at_[hidden])
Date: 2012-04-27 15:47:33

How can I use a custom generator to turn a specific node expression into 
a different version of itself without triggering endless recursive call ?

My use cas is the following, i want to catch all function node looking
like

tag::function( some_terminal, grammar, ..., grammar )

with any nbr of grammar instances

into

tag::function( some_terminal, my_tuple_terminal<grammar, ..., grammar>, 
some_other_info )

basically makign n-ary function node into ternayr node with a specific 
structures. Of course this new node should live in whatever domain 
some_terminal is coming from.

My first attempt was using make_expr in my generator but it endlessly 
looped at compile time.

Is there somethign I am missing ?