Re: [Boost-users] [Proto] Forwarding evaluation via tag

Subject: Re: [Boost-users] [Proto] Forwarding evaluation via tag
From: Eric Niebler (eric_at_[hidden])
Date: 2009-09-29 13:23:13

joel wrote:
> Eric Niebler wrote:
>> Also look into proto::functional::unpack_expr, 
<snip>

> OK, I like the idea. I tried to get it working but I stumple against the 
> fatc that proto make_expr takes push_front() as a Sequence and don't try 
> to evaulate it before hand, leading to a "no size for psuh_front" erro 
> in fusion. I'll try to get this sorted though.
> 
> My main question is that, when and when not a transform call get 
> evaluated ? Like if i do
> foo( bar ( _) )
> 
> is bar(_) evaluated before being evaluated by foo ?
> Sometimes it seems it does and sometimes no :/

You'll have to post your code ... I can't tell what problem you might be 
running into.

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