Non-enum structs are silently dropped without a wrapper file

[fcooper8472]

CppClassWrapperWriter.write() routes every struct into the struct-enum special case (cppwg/writers/class_writer.py:280-303):

if type_traits_classes.is_struct(class_decl):
    enums = class_decl.enumerations(allow_empty=True)
    if len(enums) == 1:
        ...
        self.write_files(work_dir, class_py_name)
    continue

is_struct is pygccxml's keyword test, so a struct with any enum count other than exactly one hits the bare continue and no .cppwg.hpp/.cpp is written. Nothing is logged — the run still prints INFO Generating wrappers for class Foo.

CppModuleWrapperWriter.write_module_wrapper() (module_writer.py:156-162) emits an #include "Foo.cppwg.hpp" for every non-excluded class regardless, so the failure only surfaces as a compile error in the generated module:

_pychaste_all.main.cppwg.cpp:327:10: fatal error: SemNScaledParameters.cppwg.hpp: No such file or directory

Seen with cppwg 0.4.1 wrapping struct SemNScaledParameters { double a, b, c, d; };.

Two separable points:

• non-enum structs should fall through to the normal class path rather than being skipped
• if a class is skipped, it should warn and/or be omitted from the module includes, rather than surfacing as a missing header at compile time

Related: there is no public data member support anywhere in the package (no def_readwrite/def_readonly), so even a struct that did get a wrapper would reach Python with no readable fields.

[kwabenantim]

Thanks! This looks like one to note for #105 as well.