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Subject: Re: [boost] [review] string convert
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-05-03 14:15:39

Jeff Flinn wrote:
> Stewart, Robert wrote:
> > Jeff Flinn wrote:
> >> Stewart, Robert wrote:
> >>> Gordon Woodhull wrote:
> >> // returns empty optional if cast fails
> >> boost::optional<int> oi = xxx_cast<boost::optional<int>>(s);
> >>
> > I really dislike the repetition of "boost::optional<int>" in
> > that. What about going a little farther in the dynamic_cast
> > direction (actually, following the boost::get precedent):
> >
> > int const i(xxx_cast<int>(s)); // throws on failure
> > boost::optional<int> const oi(xxx_cast<int>(&s));
> My gut reaction is that it lacks symmetry.

OK, but it does follow a precedent.

> As mentioned else-thread, doesn't C++ 0x's auto solve the
> repetition entirely, while being explicit as to what's going
> on?
> auto oi(xxx_cast<boost::optional<int>>(s));

Yes, though that doesn't help with C++03 code.

> > That name could work, but does it allow for formatting? IOW,
> > "convert," like "translate," leaves room to consider
> > formatting, including locales. "Make" suggests something
> > more fixed to me.
> I personally don't have those reservations and the
> applicability of Make. Even more concise with perhaps less
> preconceptions might be:
> as<int>(s, 123);

Not bad.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer using std::disclaimer;
Dev Tools & Components
Susquehanna International Group, LLP

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