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From: Vladimir Prus (ghost_at_[hidden])
Date: 2002-01-24 03:01:21

nbecker_at_[hidden] wrote:
> >> What I'd like (and what I'm trying to implement in command
> >> line/config
> file
> >> parser) is map like interface. So that one could be able to say
> >>
> >> environment["http_proxy"].as<ip_address>()
> >>
> >> where "as" method is a shortcut to lexical_cast/any_cast.
> What about orthogonality? I don't think translations should be built
> in. environment should give you a string. You do whatever conversion
> you want from string to whatever using nonmember functions.

I need to clarify. I don't mean that function/classes that work with
environment should bother with conversion. I mean that it would be very
convenient to have a map-like class for holding values, which would support
the following two expressions


This class should be able to get values from any sources, be it registry or
config file, using some common interface. Again, there's no need to support
casting by environment-accessing functions.

I'd like to note that "as" won't simply call lexical_cast. In command line
library it is possible to specify a type for a variable. In this case, "as"
will use "any_cast". If no type is specified, "lexical_cast" is used. I think
this is quite a considerable convenience.

- Volodya



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