hi. can someone help me? i don't understand in this example https://github.com/Olga-Yakovleva/RHVoice/blob/6ce2461e0a73c46d7ee809e9bd9fd... ```C++ stress_pattern stress=word_with_syls.eval("word_stress_pattern").as<stress_pattern>(); ``` `as<stress_pattern>()` is a function call or not?