Re: [Boost-users] [review] Formal Fast-Track review of the Boost.Functional/Factory library - 2 days left

From: Nat Goodspeed (nat_at_[hidden])
Date: 2007-12-21 15:48:29

Peter Dimov wrote:

>> given a string from a file or a script, I need to instantiate a distinct 
>> C++ class corresponding to that string.

> Typically you'll have something like
> 
> std::map< std::string, boost::function<std::auto_ptr<A>()> > s_factory;
> 
> where A is your abstract base, and initialize s_factory with
> 
> s_factory[ "X" ] = boost::factory< std::auto_ptr<X> >();

Thanks. That resembles what I built myself. I'd still like to see 
something very like this in the documentation examples.

I may still be missing opportunities for compile-time polymorphism, and 
perhaps it's true that including machinery like the above as part of an 
expanded Boost library would unnecessarily constrain the uses of the 
existing library. I'd like to see examples of some of those other uses, too.