Re: [pygccxml-development] Status of code inserters

[Allen B. <al...@vr...>]

Sounds like a well thought out plan to me.  I would be more then happy 
to help test it out once you have it implemented and integrated into py++.

-Allen

Matthias Baas wrote:

>Allen Bierbaum wrote:
>  
>
>>Matthias:
>>
>>What is the status of the code inserter's?  Do you have any py++ addons 
>>that I can try out yet?
>>    
>>
>
>I was just about to post a message on this subject....
>
>Well, I don't have a readily available addon yet, but I think the 
>general way to proceed is more or less clear. Right now, it's like I 
>have all the individual pieces spread out before me but I'm not sure how 
>to assemble them...
>
>The result from my earlier wiki entry was that there are up to two 
>functions involved:
>
>1) the wrapper function that gets called from Python and that makes a 
>call "down to" C++ where the actual work is done
>
>2) the virtual function that gets called from C++ and that may make a 
>call to Python
>
>So for the general case, an arg policy must be prepared to deal with 
>both functions and there must be an API that allows it to do so. This 
>led to some updates which I have already entered into the wiki here: 
>https://realityforge.vrsource.org/view/PyppApi/CodeInserter#Arg_policy_interface
>Basically, there are now two sets of methods to create pre-call and 
>post-call code, one for the wrapper function and one for the virtual 
>function.
>
>In the previous version I have proposed a class WrapperManager (or 
>wrapper_manager_t) that represents the code creator for the wrapper 
>function, i.e. that created the complete C++ source code. I have changed 
>this and made this class only a helper class for creating C++ functions. 
>Now it basically provides text substitution services which could be used 
>by the existing Py++ code creators. Those code creators still create the 
>rough layout of the code and insert special variables at appropriate 
>places that will get substituted by the wrapper manager.  These 
>variables represent individual parts of the C++ function. I have 
>documented the class in the wiki over here: 
>https://realityforge.vrsource.org/view/PyppApi/Wrapper_manager
>
>This wrapper manager object is also the object that the individual 
>methods of the arg policies (sometimes I also call them "code blocks" in 
>the wiki) receive as input ("wm") and which they have to use to modify 
>either the wrapper function or the virtual function.
>
>I have already implemented most parts of the mentioned classes (wrapper 
>manager, code manager, policy base class). Now I could add it to 
>pypp_api but it could only make use of the "wrapper function" part and 
>not the virtual functions. So if everyone (in particular Roman) agrees 
>with this approach, I would rather try to update the Py++ code creators 
>so that they use the text substitution service from above. But that's 
>where I'm a bit lost because I'm not familiar with the implementation 
>and all the dependencies involved.
>
>So before I continue with this I'd rather like to know if Roman agrees 
>to the general approach. The things that I'd like to do next are:
>
>- Add the "wrapper manager" class to Py++. It's more or less a 
>stand-alone module that I would stick into its own directory inside 
>"pyplusplus".
>
>- Add a new decoration attribute to the decl_wrappers that stores the 
>"arg policy" objects.
>
>- Update the Py++ calldef code creators so that they use the arg 
>policies via the above text substitution mechanism.
>
>
>Additionally, I'd like to introduce the "thread_safe" decoration 
>attribute. This involves the same code as above so I think it safes time 
>if it is done at the same time. This option should be implemented right 
>in the Py++ code creators and not via the "arg policy" mechanism because 
>it affects code on a lower level than what the arg policies are doing.
>
>
>- Matthias -
>
>
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