[C++-sig] extending with C++ and typeinfo question

[Niall Douglas]

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On 4 Jan 2004 at 18:45, John wrote:

> These are the areas I am having trouble getting my head around at the
> moment.

I foresee the following problems:

1. RTTI can't know what types python derives from i_subscriber. 
You're going to need some other mechanism here (good reason why RTTI 
is not the right thing to use here - I personally decode RTTI into a 
string and use the string as a unique identifier - it's fast, 
portable and extendable).

2. Even if you get this working, C++ entering and exiting python is 
slow. You don't want to do it iteratively like you're doing it unless 
there's any other way.

Can I suggest that you tag each event with a flag which when true 
means python has a handler installed? Then set the flag only when 
needed and use an alternative type deduction mechanism.

> How do I transmit the type of a published event through the
> interpreter so that my on_event handler knows what event is being
> processed?

RTTI really is a long unique string on any compiler I know of. Think 
of generating a long unique string from the python side and you're 
nearly done.

Cheers,
Niall





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