[pygccxml-development] mdecl and methods that return values

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

I just ran into an interesting limitation on the current API.

Namely, when you call methods on mdecl_wrappers and those methods return 
decls for further processing, the return values are ignored.

I ran into in the following case:

my_class = my_namespace["MyClass"]
my_class["mymethod"].exclude()

It could also come up in something else like this though:

similar_classes = my_namespace.classes(re_matcher(".*Proxies"))
similar_classes.member_functions["bad_function"].exclude()

The point is that that the call_redirector_t for mdecl_wrapper doesn't 
return any values from the methods it calls. 

I propose that we refactor this method to build up a list of decls 
returned from all the calls it makes and return them wrapped as a 
mdecl_wrapper_t if there are values returned and if they make sense to 
combine (ie. if they are all decl wrappers).  This should allow 
functionality like above and would add quite a bit of flexibility to 
finding groups of matches within other groups of matches.  (ex: find 
groups of similar methods inside groups of similar classes)

Any comments?

-Allen