[pygccxml-development] AttributeError for member_function_t during build_code_creator()

[Kevin B. <kev...@gm...>]

Using SVN HEAD, I've encountered AttributeError exceptions during the 
usual call to mb.build_code_creator(). It seems to involve member 
function declaration objects.

The relevant Py++ code is pretty simple:

def force_no_init(class_):
    for c in [ c for c in class_.constructors() if not 
c.is_copy_constructor ]:
        class_.remove_declaration( c )

TestNS = builder.namespace('TestNS')
TestNS.exclude()
TestClass = builder.class_('TestClass') # C++ is TestNS::TestClass
TestClass.include()
TestClass.decls().exclude()
force_no_init(TestClass)
TestClass.member_function('getValue').include()
builder.build_code_creator(module_name='test')

This worked with version 0.8.1

The first traceback was:

  File "generate_code.py", line 19, in <module>
    builder.build_code_creator(module_name='test')
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_builder\builder.py", 
line 247, in build_code_creator
    self.__code_creator = creator.create()
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_creator\creator.py", 
line 524, in create
    declarations.apply_visitor( self, decl )
  File "C:\Program 
Files\Python\Lib\site-packages\pygccxml\declarations\algorithm.py", line 
263, in apply_visitor
    getattr( visitor, fname )()
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_creator\creator.py", 
line 717, in visit_class
    if self._is_wrapper_needed( self.curr_decl, exportable_members ):
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_creator\creator.py", 
line 318, in _is_wrapper_needed
    if member.function_transformers:
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\decl_wrappers\calldef_wrapper.py", 
line 124, in _get_function_transformers
    if None is self._function_transformers:
AttributeError: 'member_function_t' object has no attribute 
'_function_transformers'

Just to experiment I changed line 124 of  
decl_wrappers\calldef_wrapper.py to:

if not hasattr(self, '_function_transformers' ) or None is 
self._function_transformers:

... although this is just a hack; I don't understand why the attribute 
is missing, so this is probably the wrong thing to do. It did eliminate 
the exception.

Patching that exposed a second AttributeError:

  File "generate_code.py", line 19, in <module>
    builder.build_code_creator(module_name='test')
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_builder\builder.py", 
line 247, in build_code_creator
    self.__code_creator = creator.create()
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_creator\creator.py", 
line 524, in create
    declarations.apply_visitor( self, decl )
  File "C:\Program 
Files\Python\Lib\site-packages\pygccxml\declarations\algorithm.py", line 
263, in apply_visitor
    getattr( visitor, fname )()
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_creator\creator.py", 
line 740, in visit_class
    exposed = self.expose_overloaded_mem_fun_using_macro( cls_decl, cls_cc )
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_creator\creator.py", 
line 687, in expose_overloaded_mem_fun_using_macro
    overloads = filter( lambda decl: decl.use_overload_macro, overloads )
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\module_creator\creator.py", 
line 687, in <lambda>
    overloads = filter( lambda decl: decl.use_overload_macro, overloads )
  File "C:\Program 
Files\Python\lib\site-packages\pyplusplus\decl_wrappers\calldef_wrapper.py", 
line 205, in get_use_overload_macro
    return self._use_overload_macro
AttributeError: 'member_function_t' object has no attribute 
'_use_overload_macro'

_use_overload_macro is assigned to False in 
calldef_wrapper.member_function_t.__init__(), so the only thing I can 
think of is that apply_visitor() is working with a class object rather 
than an instance.

Now that there's two errors I don't really understand, I thought I'd 
better just report them.

Thanks,

--- Kevin