Re: [Boost-users] [Proto] Stuck turning a complex gramamr action to a primitive trasnform

Subject: Re: [Boost-users] [Proto] Stuck turning a complex gramamr action to a primitive trasnform
From: Eric Niebler (eric_at_[hidden])
Date: 2009-10-28 16:00:20

joel wrote:
> Eric Niebler wrote:
>> I don't know what you mean. Are you referring to the fact that 
>> _make_terminal is not a primitive transform? It is a callable function 
>> object. Unfortunately, the _make_terminal name follows Proto's naming 
>> conventions for primitive transforms, even though it isn't. Is that 
>> what has thrown you off?
> 
> Ah, seems so yes. So I have to take it's boost::result_of instead of 
> seekign a non-existant result_of::make_terminal ?

proto::_make_terminal is just a typedef for 
proto::functional::make_terminal, which is itself a typedef for 
proto::functional::make_expr<proto::tag::terminal>. If you're looking 
for the corresponding result_of:: metafunction, you should use 
proto::result_of::make_expr<proto::tag::terminal, ...args...>

> If yes is my idea of composing ok ?

Sure.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com