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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

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