On Wednesday 08 February 2006 17:41, Rene Rivera wrote:

There's no easy way for the boost.any code to work with polymorphic types as you expect since there's no current way to know what types are convertible at runtime. (Perhaps when there's a boost.reflect)

Actually you gave me the solution. It just happens that in my project there is a type registry ( a registry where different objects register information about their type, information including base types ) - not quite a complete reflection system but has the info i need. I'll have to use unsafe_any_cast witch i've seen that it's not in the public interface of boost.any but i'll just have to live with it ( and hope it will never change ). it goes something like this class A {}; //base calss class B: public A {}; // derived class int main() {    B *b = new B(); //create derived class          boost::any n(b); // place inside boost::any if( TypeManager::type( n.type() )->findBaseClass(a)) { A* a=unsafe_any_cast(n); } else throw ... } Thanks, Iulian -- I used to be an agnostic, but now I'm not so sure.

Bruno Martínez wrote:

On Wed, 08 Feb 2006 13:41:57 -0200, Rene Rivera wrote:

...

There's no easy way for the boost.any code to work with polymorphic types as you expect since there's no current way to know what types are convertible at runtime. (Perhaps when there's a boost.reflect)

I think dynamic_any already works as the OP needs.

Which is available where? -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - grafikrobot/yahoo

On Thursday 09 February 2006 14:35, Bruno Martínez wrote:

...

...

I think dynamic_any already works as the OP needs.

Which is available where?

Here, although some pages are broken

http://cpp-experiment.sourceforge.net/

I've tryed dynamic_any but does not compile with latest boost. Also tryed modifying it but no luck. boost.mpl seems to have changed interface since dynamic_any was written. I also got very familiar with boost.any these days and realized it would be very nice if it had a policy based design that would allow the user to change the holder class and the way it is cast to the required type. -- Others will look to you for stability, so hide when you bite your nails.