Error in docs

[Dainis Polis]

Hi!
I think found error in documentation :  
trunk/libs/spirit/doc/html/spirit/qi/reference/auxiliary/lazy.html
following text :

// forwards to <boost/spirit/home/qi/auxiliary/lazy.hpp>
#include <boost/spirit/include/qi_lazy.hpp>

But  boost/spirit/include/qi_lazy.hpp don't exists, only

boost/spirit/home/qi/auxiliary/lazy.hpp








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[Hartmut Kaiser]

> I think found error in documentation :
> trunk/libs/spirit/doc/html/spirit/qi/reference/auxiliary/lazy.html
> following text :
>
> // forwards to <boost/spirit/home/qi/auxiliary/lazy.hpp>
> #include <boost/spirit/include/qi_lazy.hpp>
>
> But  boost/spirit/include/qi_lazy.hpp don't exists, only
>
> boost/spirit/home/qi/auxiliary/lazy.hpp

I added (supposedly) all referenced but missing header files yesterday.
Could you update, pls?

Thanks!
Regards Hartmut

-------------------
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[Dainis Polis]

Hartmut Kaiser wrote:
> I added (supposedly) all referenced but missing header files yesterday.
> Could you update, pls?
>
>  
Yes,  now qi_lazy  exists , but actualy my point where to read in docs  
something
about  qi::lazy() , because i don't understand argument type for  
qi::lazy()  , and
if result of  qi::lazy()  is rule , then  where this function comes from?

I found in test:
 r = char_[_val = _1] >> *qi::lazy(_val)
Second _val as  i unserstand is rules  r  composite  attribute.
Then how from this attribute  can be constructed rule qi::lazy() , i
don't understand .
Maybe somwhere is a good practic example where   qi::lazy() can be used?



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[Hartmut Kaiser]

> Hartmut Kaiser wrote:
> > I added (supposedly) all referenced but missing header files
> yesterday.
> > Could you update, pls?
> >
> >
> Yes,  now qi_lazy  exists , but actualy my point where to read in docs
> something
> about  qi::lazy() , because i don't understand argument type for
> qi::lazy()  , and
> if result of  qi::lazy()  is rule , then  where this function comes
> from?
>
> I found in test:
>  r = char_[_val = _1] >> *qi::lazy(_val)
> Second _val as  i unserstand is rules  r  composite  attribute.
> Then how from this attribute  can be constructed rule qi::lazy() , i
> don't understand .
> Maybe somwhere is a good practic example where   qi::lazy() can be
> used?

lazy(p) allows you to lazily (hence the name) - at parse time - decide what
parser to execute. The argument of lazy() is interpreted (dynamically, at
parse time) as a parser expression. The result of lazy is not a rule but an
instance of a parser component.

The example you mentioned uses the parsed character as a parser itself.

    rule<char const*, char()> r = char_[_val = _1] >> *qi::lazy(_val);

_val refers to the attribute of r (which is a char), which then is used as a
parser, so the whole thing matches any character one or more times.

Regards Hartmut

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Meet me at BoostCon
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