Re: [boost] [spirit] trunk: circular dependency parse <-> construct <-> assign_to (?)

From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2008-05-29 19:59:28

Thanks Troy! 

I just wanted to start investigating and - voila! You already did it! I'll
incorporate your patch asap.

Regards Hartmut

> -----Original Message-----
> From: boost-bounces_at_[hidden] [mailto:boost-
> bounces_at_[hidden]] On Behalf Of troy d. straszheim
> Sent: Thursday, May 29, 2008 2:29 PM
> To: boost_at_[hidden]
> Subject: Re: [boost] [spirit] trunk: circular dependency parse <->
> construct <-> assign_to (?)
> 
> Hey Hartmut,
> 
> I've got a workaround, like so:
> 
> If you forward declare the construct() overloads for the different
> primitive Attribute types, gcc seems to not greedily match this one
> (the current error):
> 
>        template <typename Attribute, typename Iterator>
>        inline void
>        construct(Attribute& attr, Iterator const& first, Iterator
> const& last)
>        {
> 	attr = Attribute(first, last);
>        }
> 
> and instead to wait for this one (correct):
> 
>          template <typename Iterator>
>          inline void
>          construct(unsigned int& attr, Iterator const& first,
>              Iterator const& last)
>          {
>              Iterator first_ = first;
>              parse(first_, last, uint_, attr);
>          }
> 
> So I've got local mods of adding
> 
>    #include <boost/spirit/home/qi/detail/construct_fwd.hpp>
> 
> to the top of assign_to.hpp, and the construct_fwd.hpp is attached.
> 
> I don't entirely get it, but I do like the looks of this:
> 
> troy_at_uranium:~/Projects/boost/trunk/libs/spirit/example/lex
> % gcc -o example4 example4.cpp -I . -I ../../../.. -lstdc++
> 
> troy_at_uranium:~/Projects/boost/trunk/libs/spirit/example/lex
> % ./example4
> assignment statement to: a
> if expression: variable
> assignment statement to: b
> if expression: 2
> assignment statement to: c
> assignment statement to: d
> if expression: x
> while expression: 10
> assignment statement to: variable
> -------------------------
> Parsing succeeded
> -------------------------
> Bye... :-)
> 
> 
> 
> Best,
> 
> -t
> 
>