Re: [Boost-users] [any] Is it possible to support polymorphism in boost::any?

This feature is a must! 2010/9/7 Tang Jiang Jun :

That's an excellent idea! It's so concise and delicate to use different internal holders to represent different sub-objects. However I have a question about the query. How should a any object find which holder is the correct one to the casting query for one special base class? Thanks!

On Mon, Sep 6, 2010 at 9:05 PM, Steven Watanabe wrote:

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AMDG

Tang Jiang Jun wrote:

...

After thinking deeper, I figure out a rough implementation for this idea, and prove it can work with polymorphism. (It is just rough concept verification, and need a lot of work to polish it and make it usable).

A more automated way would be to use multiple inheritance and cross cast.

class any_impl_base { public:   virtual ~any_impl_base() {} };

template class any_impl : public T, public any_impl_base {};

In Christ, Steven Watanabe

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