[C++-sig] pybindgen add_function_as_constructor

[Robin Gilks]

Following on from my expanding embedded code thread, I'm making progress 
in that if I hack the class instantiation in the wrapper that pybindgen 
produces I can get it all to work.

With that in mind, I'm trying to use add_function_as_constructor but it 
won't let me use a 'void *' or 'PyObject *' pointer as a parameter. I 
have to use 'uint32_t *' and then edit the code!!

My generator code looks like this...

testclass = mod.add_class('testclass')
    testclass.add_function_as_constructor('PyCObject_AsVoidPtr', None, 
[Parameter.new(''PyObject *', 'instance', transfer_ownership = False)])
which results in the traceback of...
Traceback (most recent call last):
  File "testclassgen.py", line 31, in <module>
    my_module_gen(sys.stdout)
  File "testclassgen.py", line 28, in my_module_gen
    mod.generate(FileCodeSink(out_file) )
  File "/usr/local/lib/python2.5/site-packages/pybindgen/module.py", 
line 839, in generate
    self.do_generate(sink_manager, module_file_base_name)
  File "/usr/local/lib/python2.5/site-packages/pybindgen/module.py", 
line 721, in do_generate
    class_.generate(sink, self)
  File "/usr/local/lib/python2.5/site-packages/pybindgen/cppclass.py", 
line 1481, in generate
    have_constructor = self._generate_constructor(code_sink)
  File "/usr/local/lib/python2.5/site-packages/pybindgen/cppclass.py", 
line 1620, in _generate_constructor
    overload.generate(code_sink)
  File 
"/usr/local/lib/python2.5/site-packages/pybindgen/overloading.py", line 
183, in generate
    (code_sink,), {}, self.all_wrappers[0])
  File "/usr/local/lib/python2.5/site-packages/pybindgen/utils.py", line 
124, in call_with_error_handling
    return callback(*args, **kwargs)
  File "/usr/local/lib/python2.5/site-packages/pybindgen/cppmethod.py", 
line 520, in generate
    % self._class.name)
AssertionError: something went wrong with the type handlers; 
constructors need parameter names, yet no names were given for the class 
testclass constructor

If I change the 'PyObject *' to a 'void *' I get...Traceback (most 
recent call last):
  File "testclassgen.py", line 31, in <module>
    my_module_gen(sys.stdout)
  File "testclassgen.py", line 16, in my_module_gen
    testclass.add_function_as_constructor('PyCObject_AsVoidPtr', None, 
[Parameter.new('void *', 'instance', transfer_ownership = False)])
  File 
"/usr/local/lib/python2.5/site-packages/pybindgen/typehandlers/base.py", 
line 1221, in new
    param_type_matcher.lookup(ctype)
  File 
"/usr/local/lib/python2.5/site-packages/pybindgen/typehandlers/base.py", 
line 1350, in lookup
    raise TypeLookupError(tried_names)
pybindgen.typehandlers.base.TypeLookupError: ['void *']

but looking at pybindgen-0.10.0/pybindgen/typehandlers/base.py it looks 
like at least void * should be OK!!

I either still missing something (very likely) or there is a problem here!

-- 
Robin






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