From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-06-11 07:35:30
> Seems natural to use boost::optional with program_options. Has anyone
> tried this?
This request is amount my "todo" list since formal review, but I still haven't
implemented it. The biggest problem is to make it work without adding
dependency on <boost/optional.hpp>
> ("help", "produce help message")
> ("x", po::value<double>()->notifier (var(x)=_1))
> To set the optional<double> x, this uses boost::lambda. Is there a more
> direct approach?
One thing I consider is to forward-declare boost::optional and then add a
templated constructor to 'typed_value' which will do the same thing that
does above. Another possibility is to make the type of pointer stored in
'typed_value' into a template parameter. But that would not help, since
optional can be read like pointer, but can't be assigned with *opt = 10;
I'll try to think more about the first approach, but it might take some time,
since now I'm primarily focused an fixing regression test failures.
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