question about caml_get_public_method

question about caml_get_public_method

[Michael Wohlwend]

if I want to connect a c++ method to a method of an ocaml class, I can choose between:
a) in the initializer of the ocaml class use register_value to register a method (like self#some_method) and then calling an external function which caches the registered value and calls that method

or

b) calling an external function with the ocaml object as argument and then  use caml_get_public_method, cache the method-id of the callback methods and use those to make the callback.

Is this just a matter of taste which one to use?

cheers
 Michael
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Re: [Caml-list] question about caml_get_public_method

[Jacques Garrigue]

From: "Michael Wohlwend" <micha-1@fantasymail.de>

> if I want to connect a c++ method to a method of an ocaml class, I can choose between:
> a) in the initializer of the ocaml class use register_value to register a method (like self#some_method) and then calling an external function which caches the registered value and calls that method
> 
> or
> 
> b) calling an external function with the ocaml object as argument and then  use caml_get_public_method, cache the method-id of the callback methods and use those to make the callback.
> 
> Is this just a matter of taste which one to use?

The second approach is going to be slightly simpler (no need to split
registration code between ocaml and C++, and the method ids do not
depend on the object/class.) Note that you don't really need to cache
the method itself, as caml_get_public_method is really fast.
You can also generate the method ids beforehand, avoiding need for any
cacheing. Here is a tool to do that.
http://camlcvs.inria.fr/cgi-bin/cvsweb/bazar-ocaml/lablGL/src/var2def.ml?rev=1.9
The 1st approach should work too.

Jacques Garrigue