Merge "libbinder_ndk: support for nullable parcelables" (9609d975) · Commits · e / os / android_frameworks_native-old

libs/binder/ndk/include_ndk/android/binder_parcel_utils.h

+35 −0

Original line number	Diff line number	Diff line
		@@ -448,6 +448,41 @@ static inline binder_status_t AParcel_readParcelable(const AParcel* parcel, P* p
		return p->readFromParcel(parcel);
		}

		/**
		* Convenience API for writing a nullable parcelable.
		*/
		template <typename P>
		static inline binder_status_t AParcel_writeNullableParcelable(AParcel* parcel,
		const std::optional<P>& p) {
		if (p == std::nullopt) {
		return AParcel_writeInt32(parcel, 0); // null
		}
		binder_status_t status = AParcel_writeInt32(parcel, 1); // non-null
		if (status != STATUS_OK) {
		return status;
		}
		return p->writeToParcel(parcel);
		}

		/**
		* Convenience API for reading a nullable parcelable.
		*/
		template <typename P>
		static inline binder_status_t AParcel_readNullableParcelable(const AParcel* parcel,
		std::optional<P>* p) {
		int32_t null;
		binder_status_t status = AParcel_readInt32(parcel, &null);
		if (status != STATUS_OK) {
		return status;
		}
		if (null == 0) {
		*p = std::nullopt;
		return STATUS_OK;
		}
		*p = std::optional<P>(P{});
		return (*p)->readFromParcel(parcel);
		}

		/**
		* Writes a parcelable object of type P inside a std::vector<P> at index 'index' to 'parcel'.
		*/