Method operator()

extlibs/sol3/include/sol/sol.hpp:17258–17266

		}

		int operator()(lua_State* L) {
			if (!no_trampoline) {
				auto f = [&](lua_State*) -> int { return this->call(L); };
				return detail::trampoline(L, f);
			}
			else {
				return call(L);
			}
		}
	};

	template <typename T, typename Function, bool is_yielding>