Re: [Boost-users] [Proto] Failed to Mimic the "Lazy Vector" Example

Subject: Re: [Boost-users] [Proto] Failed to Mimic the "Lazy Vector" Example
From: Hossein Haeri (powerprogman_at_[hidden])
Date: 2010-12-09 08:30:42

Hi Thomas,

> > Trying to mimic what comes in the Lazy Vector example
> > 
http://www.boost.org/doc/libs/1_45_0/doc/html/proto/users_guide.html#boost_proto.users_guide.examples
<snip>

> The type EmtDomain is incomplete when it is used in EmtExpr
> (proto::extends ...).

So is also lazy_vector_domain when it is used in lazy_vector_expr. What's different here? (See below.)

> The solution is to forward declare EmtExpr, define the Domain and then
> define the expression wrapper.

Thanks, that works. :) But, I do still wonder why the same order of definition for Lazy Vector didn't work here:

Grammar > Forward Declaration of Domain > (Context) > Expression Wrapper > Domain

Do you mind shedding light on this too?

TIA,
--Hossein