The following Cython source:
cdef extern from "header":
cdef cppclass String
cdef cppclass List[T]
cdef cppclass StringList(List[String])
cdef cppclass String:
String()
int length()
cdef cppclass List[T]:
List()
int length()
cdef cppclass StringList(List[String]):
StringList()
void sort()
causes a crash:
Error compiling Cython file:
------------------------------------------------------------
...
cdef cppclass List[T]:
List()
int length()
cdef cppclass StringList(List[String]):
^
------------------------------------------------------------
s.pyx:14:9: Cannot inherit from incomplete type
Error compiling Cython file:
------------------------------------------------------------
...
cdef cppclass List[T]:
List()
int length()
cdef cppclass StringList(List[String]):
StringList()
^
------------------------------------------------------------
s.pyx:15:8: Compiler crash in AnalyseDeclarationsTransform
File 'ModuleNode.py', line 101, in analyse_declarations: ModuleNode(s.pyx:1:0,
full_module_name = 's')
File 'Nodes.py', line 382, in analyse_declarations: StatListNode(s.pyx:1:5)
File 'Nodes.py', line 438, in analyse_declarations: CDefExternNode(s.pyx:1:5,
include_file = u'header')
File 'Nodes.py', line 382, in analyse_declarations: StatListNode(s.pyx:2:4)
File 'Nodes.py', line 1313, in analyse_declarations: CppClassNode(s.pyx:14:9,
base_classes = [...]/1,
name = u'StringList',
visibility = u'extern')
File 'Nodes.py', line 1203, in analyse_declarations: CVarDefNode(s.pyx:15:8,
modifiers = [...]/0,
visibility = u'extern')
Compiler crash traceback from this point on:
File ".../Cython/Compiler/Nodes.py", line 1203, in analyse_declarations
api = self.api, modifiers = self.modifiers)
File ".../Cython/Compiler/Symtab.py", line 2131, in declare_cfunction
self.check_base_default_constructor(pos)
File ".../Cython/Compiler/Symtab.py", line 2108, in \
check_base_default_constructor
temp_entry = base_class.scope.lookup_here("<init>")
AttributeError: 'NoneType' object has no attribute 'lookup_here'
There seem to be two problems here: the AttributeError crash, but also the
earlier "Cannot inherit from incomplete type" message. None of the types look
incomplete; if you comment out the forward declarations, no error is reported:
so it looks as if the forward declarations aren't being tied up with the actual
declarations. In the actual use case, of course, I need the forward decls.
Regards,
Vinay Sajip
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