Re: [boost] [spirit] Support for one-pass iterators?

Subject: Re: [boost] [spirit] Support for one-pass iterators?
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-10-19 12:55:12

Hartmut Kaiser wrote:
>
> > Hmm... I may be misinterpreting what I see at
> > boost/spirit/home/qi/nonterminal/grammar.hpp:54, in the
> > release branch:
> >
> >      grammar(
> >          start_type const& start
> >        , std::string const& name_ = "unnamed-grammar")
> > =>  : proto::extends<terminal,
> > base_type>(terminal::make(start.alias()))
> >      , name_(name_)
> >      {}
> >
> > Here "start" is a reference to a not yet constructed object.
>
> All the construct is doing is to use the address of start
> (which is known
> and well defined at this point). The address of an object
> doesn't change
> during construction. Just look at the code, you'll see it.
> The code does not
> refer to any member data items of 'start'. I see no problem
> with this.

It would appear that the point of confusion is "start.alias()."  That appears to invoke a start_type member function on, apparently, a reference to a data member in a derivate.

It is legal to use &start to initialize a pointer, but I think calling any member function is not.  I'd have to look over the standard language carefully to state that unequivocally.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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