GObject
        GSimpleAction
        GSimpleActionGroup
        GAppLaunchContext
        GApplication
        GInputStream
            GFilterInputStream
                GBufferedInputStream
                    GDataInputStream
                GConverterInputStream
            GFileInputStream
            GMemoryInputStream
            GUnixInputStream
        GOutputStream
            GFilterOutputStream
                GBufferedOutputStream
                GConverterOutputStream
                GDataOutputStream
            GFileOutputStream
            GMemoryOutputStream
            GUnixOutputStream
        GCancellable
        GCharsetConverter
        GDesktopAppInfo
        GEmblem
        GEmblemedIcon
        GFileEnumerator
        GFileIcon
        GFileInfo
        GIOStream
            GFileIOStream
            GSocketConnection
                GTcpConnection
                    GTcpWrapperConnection
                GUnixConnection
            GTlsConnection
        GFileMonitor
        GFilenameCompleter
        GInetAddress
        GSocketAddress
            GInetSocketAddress
                GProxyAddress
            GUnixSocketAddress
        GTypeModule
            GIOModule
        GMountOperation
        GVolumeMonitor
        GNetworkAddress
        GNetworkService
        GPermission
            GSimplePermission
        GSocketAddressEnumerator
            GProxyAddressEnumerator
        GResolver
        GSettings
        GSettingsBackend
        GSimpleAsyncResult
        GSocketClient
        GSocketControlMessage
            GUnixFDMessage
            GUnixCredentialsMessage
        GSocket
        GSocketListener
            GSocketService
                GThreadedSocketService
        GThemedIcon
        GTlsCertificate
        GTlsDatabase
        GTlsPassword
        GUnixFDList
        GUnixMountMonitor
        GVfs
        GZlibCompressor
        GZlibDecompressor
        GDBusMessage
        GDBusConnection
        GDBusProxy
        GDBusMethodInvocation
        GDBusServer
        GDBusAuthObserver
        GCredentials
        GDBusInterfaceSkeleton
        GDBusObjectSkeleton
        GDBusObjectProxy
        GDBusObjectManagerClient
        GDBusObjectManagerServer
        GApplicationCommandLine
        GTlsInteraction
    GInterface
        GAction
        GActionGroup
        GAppInfo
        GAsyncInitable
        GAsyncResult
        GConverter
        GInitable
        GDrive
        GIcon
        GFileDescriptorBased
        GFile
        GLoadableIcon
        GSeekable
        GSocketConnectable
        GMount
        GPollableInputStream
        GPollableOutputStream
        GProxy
        GProxyResolver
        GTlsBackend
        GTlsClientConnection
        GTlsFileDatabase
        GTlsServerConnection
        GVolume
        GDBusInterface
        GDBusObject
        GDBusObjectManager
    GBoxed
        GFileAttributeMatcher
        GSrvTarget
        GDBusAnnotationInfo
        GDBusArgInfo
        GDBusPropertyInfo
        GDBusSignalInfo
        GDBusMethodInfo
        GDBusInterfaceInfo
        GDBusNodeInfo