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

[c_object_p, c_uint],
   c_object_p),

  ("clang_getDiagnosticCategory",
   [Diagnostic],
   c_uint),

  ("clang_getDiagnosticCategoryText",
   [Diagnostic],
   _CXString,
   _CXString.from_result),

  ("clang_getDiagnosticFixIt",
   [Diagnostic, c_uint, POINTER(SourceRange)],
   _CXString,
   _CXString.from_result),

  ("clang_getDiagnosticInSet",
   [c_object_p, c_uint],
   c_object_p),

  ("clang_getDiagnosticLocation",
   [Diagnostic],
   SourceLocation),

  ("clang_getDiagnosticNumFixIts",
   [Diagnostic],
   c_uint),

  ("clang_getDiagnosticNumRanges",
   [Diagnostic],
   c_uint),

def from_result(res, fn, args):
        assert isinstance(res, _CXString)
        return conf.lib.clang_getCString(res)

c_object_p),

  ("clang_getDiagnosticLocation",
   [Diagnostic],
   SourceLocation),

  ("clang_getDiagnosticNumFixIts",
   [Diagnostic],
   c_uint),

  ("clang_getDiagnosticNumRanges",
   [Diagnostic],
   c_uint),

  ("clang_getDiagnosticOption",
   [Diagnostic, POINTER(_CXString)],
   _CXString,
   _CXString.from_result),

  ("clang_getDiagnosticRange",
   [Diagnostic, c_uint],
   SourceRange),

  ("clang_getDiagnosticSeverity",
   [Diagnostic],
   c_int),

  ("clang_getDiagnosticSpelling",
   [Diagnostic],
   _CXString,
   _CXString.from_result),

("clang_getTokenExtent",
   [TranslationUnit, Token],
   SourceRange),

  ("clang_getTokenKind",
   [Token],
   c_uint),

  ("clang_getTokenLocation",
   [TranslationUnit, Token],
   SourceLocation),

  ("clang_getTokenSpelling",
   [TranslationUnit, Token],
   _CXString,
   _CXString.from_result),

  ("clang_getTranslationUnitCursor",
   [TranslationUnit],
   Cursor,
   Cursor.from_result),

  ("clang_getTranslationUnitSpelling",
   [TranslationUnit],
   _CXString,
   _CXString.from_result),

  ("clang_getTUResourceUsageName",
   [c_uint],
   c_char_p),

def disable_option(self):
        """The command-line option that disables this diagnostic."""
        disable = _CXString()
        conf.lib.clang_getDiagnosticOption(self, byref(disable))

        return conf.lib.clang_getCString(disable)

def briefComment(self):
        if conf.function_exists("clang_getCompletionBriefComment"):
            return conf.lib.clang_getCompletionBriefComment(self.obj)
        return _CXString()