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

    @CachedProperty
    def num_chunks(self):
        return conf.lib.clang_getNumCompletionChunks(self.obj)

    @CachedProperty
    def lib(self):
        lib = self.get_cindex_library()
        register_functions(lib, not Config.compatibility_check)
        Config.loaded = True
        return lib

    @CachedProperty
    def kind(self):
        return completionChunkKindMap[self.__kindNumber]

    @CachedProperty
    def spelling(self):
        if self.__kindNumber in SpellingCache:
                return SpellingCache[self.__kindNumber]
        return conf.lib.clang_getCompletionChunkText(self.cs, self.key).spelling

    @CachedProperty
    def string(self):
        res = conf.lib.clang_getCompletionChunkCompletionString(self.cs,
                                                                self.key)

        if (res):
          return CompletionString(res)
        else:
          None