Re: [boost] [proto] small breaking change

Subject: Re: [boost] [proto] small breaking change
From: joel falcou (joel.falcou_at_[hidden])
Date: 2010-06-09 02:05:01

Eric Niebler wrote:
> I just made a change to proto in the effort to reduce compile times.
> There's a new expression type, proto::basic_expr, that is lighter weight
> than proto::expr in that it doesn't define the operator=, operator[] and
> operator() member functions. It's ideal as a base when extending
> expressions with proto::extends or BOOST_PROTO_EXTENDS.
>
>   
Nice idea !
> You'll get basic_expr instead of expr automatically if you use either of
> proto::generator or proto::pod_generator. That could surprise you if you
> were expecting to get an expr, so beware. Most normal uses of Proto will
> just work with this change, though, and if you measure you should see a
> modest improvement in your compile times
What's the protocol to get the old expr back ? Should we write
a custom generator or is there any already ?