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 10:24:07

Christian Schladetsch wrote:
> On Tue, Oct 20, 2009 at 3:06 AM, Andrey Semashev
> <andrey.semashev_at_[hidden]>wrote:
> > Christian Schladetsch wrote:
> >
> >> Sure, but this is basic C++. Before the ctor to
> >> grammar(...) is invoked, the
> >> arguments to it have been evaluated. This requires
> >> construction of its arguments.
> >
> > That is not true. The base class constructor is called
> > _before_ any members are constructed. Try it yourself.
> >
> I am not sure what you are referring to. Before the C++
> compiler passes a
> reference to something, it has constructed it. The example
> you gave was of a
> ctor taking a reference. Before that ctor is executed, I will
> personally
> guarantee that it and all it's base classes have been constructed.

You can pass a reference to a data member to a base class constructor in a derivate's initializer list.  If the base class constructor tries to use the reference, it will result in undefined behavior.  (I'm not commenting on the supposed Spirit problem suggested by the OP.)

> You are working under a delusion that should be corrected very soon.

I think you're jumping to conclusions.

_____
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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