How to use the pybind11.tools.clang.cindex.File function in pybind11

def visitor(fobj, lptr, depth, includes):
            if depth > 0:
                loc = lptr.contents
                includes.append(FileInclusion(loc.file, File(fobj), loc, depth))

def _get_instantiation(self):
        if self._data is None:
            f, l, c, o = c_object_p(), c_uint(), c_uint(), c_uint()
            conf.lib.clang_getInstantiationLocation(self, byref(f), byref(l),
                    byref(c), byref(o))
            if f:
                f = File(f)
            else:
                f = None
            self._data = (f, int(l.value), int(c.value), int(o.value))
        return self._data

def get_file(self, filename):
        """Obtain a File from this translation unit."""

        return File.from_name(self, filename)

Type.from_result),

  ("clang_getIncludedFile",
   [Cursor],
   File,
   File.from_cursor_result),

  ("clang_getInclusions",
   [TranslationUnit, callbacks['translation_unit_includes'], py_object]),

  ("clang_getInstantiationLocation",
   [SourceLocation, POINTER(c_object_p), POINTER(c_uint), POINTER(c_uint),
    POINTER(c_uint)]),

  ("clang_getLocation",
   [TranslationUnit, File, c_uint, c_uint],
   SourceLocation),

  ("clang_getLocationForOffset",
   [TranslationUnit, File, c_uint],
   SourceLocation),

  ("clang_getNullCursor",
   None,
   Cursor),

  ("clang_getNumArgTypes",
   [Type],
   c_uint),

  ("clang_getNumCompletionChunks",
   [c_void_p],

def from_name(translation_unit, file_name):
        """Retrieve a file handle within the given translation unit."""
        return File(conf.lib.clang_getFile(translation_unit, file_name))

[File],
   _CXString), # TODO go through _CXString.from_result?

  ("clang_getFileTime",
   [File],
   c_uint),

  ("clang_getIBOutletCollectionType",
   [Cursor],
   Type,
   Type.from_result),

  ("clang_getIncludedFile",
   [Cursor],
   File,
   File.from_cursor_result),

  ("clang_getInclusions",
   [TranslationUnit, callbacks['translation_unit_includes'], py_object]),

  ("clang_getInstantiationLocation",
   [SourceLocation, POINTER(c_object_p), POINTER(c_uint), POINTER(c_uint),
    POINTER(c_uint)]),

  ("clang_getLocation",
   [TranslationUnit, File, c_uint, c_uint],
   SourceLocation),

  ("clang_getLocationForOffset",
   [TranslationUnit, File, c_uint],
   SourceLocation),

def from_cursor_result(res, fn, args):
        assert isinstance(res, File)

        # Copy a reference to the TranslationUnit to prevent premature GC.
        res._tu = args[0]._tu
        return res