Plugin project proposal

[Zhanna Tsitkova]

On Jul 15, 2010, at 1:14 PM, Russ Allbery wrote:

>>
>> 2.  2. It was suggested to use hash tables for the plugin  
>> interfaces in
>> lieu of C structures. This would provide better plugin impl. version
>> control and interface extensibility.
>
> I'm not sure what you mean by hash tables here.

Suppose we have defined an interface for plugin_A.
At later time one may want to extend  the interface of this plugin.
Now, can these two versions coexist? Yes, and one of the possible  
solutions is to implement v-tables as hashes.
In this case the interface consumer can check for the availability of  
the new method by querying  the hash-table. If "new method" is not  
implemented, it returns null pointer. And one can decide how to  
proceed further.