Method map

Libs/sol/sol.hpp:4731–4733

		/// \synopsis template <class F> constexpr auto map(F &&f) &;
		template <class F>
		SOL_TL_OPTIONAL_11_CONSTEXPR auto map(F&& f) & {
			return optional_map_impl(*this, std::forward<F>(f));
		}

		/// \group map
		/// \synopsis template <class F> constexpr auto map(F &&f) &&;