kanzi::DataObject Class Reference

DataObject is the base class for data. More...

#include <kanzi/core.ui/data/data_object.hpp>

Inheritance diagram for kanzi::DataObject:

Public Types
typedef ChildContainer::const_iterator	ChildConstIterator
typedef ChildContainer::const_reverse_iterator	ChildConstReverseIterator
typedef vector< DataObjectSharedPtr >	ChildContainer
enum	Type {   Object, Integer, Real, Bool,   String, Enum, List }
	Type enumerations for different data object types. More...
Public Types inherited from kanzi::DataContext
typedef function< void()>	ModifiedFunction
	Callback function type for change subscriptions. More...
typedef shared_ptr< void >	ModifiedSubscriptionToken
	Token type that can be used to identify the change subscription. More...
Public Types inherited from kanzi::PropertyObject
typedef PropertyStorageContainer::const_iterator	PropertyStorageConstIterator
typedef vector< PropertyStoragePtr >	PropertyStorageContainer
typedef PropertyStorageContainer::iterator	PropertyStorageIterator
typedef intrusive_ptr< AbstractPropertyTypeDescriptor::PropertyStorage >	PropertyStoragePtr
typedef PropertyStorageContainer::reverse_iterator	PropertyStorageReverseIterator

Public Member Functions
void	addChild (const DataObjectSharedPtr &child)
	Adds data object as child of this object. More...
ChildConstIterator	beginChildren () const
	Returns iterator to start of the child container. More...
ChildConstIterator	endChildren () const
	Returns iterator in the end of the child container. More...
DataObjectSharedPtr	findChild (string_view name)
	Tries to find a child with given name. More...
DataObjectSharedPtr	getChild (size_t index) const
	Retrieves a child object in given index. More...
size_t	getChildCount () const
	Retrieves the count of child objects in this data object. More...
size_t	getChildIndex (const DataObject &child) const
	Retrieves the index of a child data object. More...
DataObjectSharedPtr	getData () override
	DataContext interface. More...
string	getName () const
	Allows to retrieve the name of the object. More...
DataObjectSharedPtr	getParent () const
	Retrieves the parent DataObject of this DataObject. More...
virtual Type	getType () const
	Allows to retrieve the type of the object. More...
bool	hasChild (const DataObject &child) const
	Checks whether or not the child exists. More...
void	insertChild (size_t index, const DataObjectSharedPtr &child)
	Inserts data object as child of this object, allows to specify index of the object. More...
DataContextSharedPtr	lookupDataContext (string_view relativePath) override
	Performs object look-up by path. More...
virtual Variant	readVariant ()
	Read data object contents into a variant. More...
void	removeAllChildren ()
	Removes all children. More...
void	removeChild (const DataObject &child)
	Removes a child object from the list of children. More...
void	removeChild (size_t index)
	Removes a child object in given index. More...
void	setName (string_view value)
	Sets the name of the object. More...
void	setParent (DataObjectSharedPtr parent)
	Assigns a parent DataObject to this DataObject. More...
Public Member Functions inherited from kanzi::DataContext
ModifiedSubscriptionToken	addModifiedNotificationHandler (ModifiedFunction callback)
	Allows to subscribe to modifications in this data context. More...
template<typename Type >
shared_ptr< Type >	lookupDataContextOfType (string_view relativePath)
void	notifyModified ()
	Triggers modification procedure in this data context, which invokes the subscriptions. More...
void	removeModifiedNotificationHandler (ModifiedSubscriptionToken token)
	Allows to unsubscribe from modifications in this data context. More...
Public Member Functions inherited from kanzi::Resource
virtual unsigned int	getCPUMemoryUsage () const
	Function for getting the memory usage of a resource. More...
const string &	getName () const
	Gets the resource name. More...
const string &	getUrl () const
	Gets the resource URL. More...
bool	isKeepAlive () const
	Tells if the resource has keep alive flag set. More...
void	reload ()
void	reloadFromFile (string_view filePath)
void	reloadFromKzb (KzbFile &kzbFile, ReadOnlyMemoryFile &file, KzbMemoryParser &parser)
void	setKeepAlive (bool keepAlive)
	Sets the keep alive flag. More...
void	setUrl (string_view url)
	Sets the resource URL. More...
	~Resource () override
	Destructor. More...
Public Member Functions inherited from kanzi::Object
AppliedStyleEntrySharedPtr	applyObjectStyle (kanzi::StyleSharedPtr style)
	Applies a style to an object. More...
void	applyObjectStyles ()
	Apply all styles for an object node. More...
Domain *	getDomain () const
	Returns the domain the object belongs to. More...
const Metaclass *	getDynamicMetaclass () const override
	Returns the metaclass of the dynamic type of the object. More...
MainLoopScheduler *	getMainLoopScheduler () const
	Returns the MainLoopScheduler instance of the associated Domain. More...
detail::MessageDispatcher *	getMessageDispatcher () const
	Returns the message dispatcher of the object. More...
ResourceManager *	getResourceManager () const
	Returns the resource manager of the object. More...
ScriptingContextSharedPtr	getScriptingContext () const
	Gets the scripting context of the object. More...
	Object (Domain *domain)
void	setScriptingContext (ScriptingContextSharedPtr context)
	Sets the scripting context of the object. More...
void	unapplyObjectStyle (AppliedStyleEntrySharedPtr appliedStyleEntry)
void	unapplyObjectStyles ()
	Unapplies and removes all applied styles. More...
	~Object () override
Public Member Functions inherited from kanzi::MetaObject
bool	isTypeOf (const Metaclass *objectType) const
	Determines if the type of this object is the given type or derived from it. More...
virtual	~MetaObject ()
Public Member Functions inherited from kanzi::PropertyObject
template<typename DataType >
void	addPropertyModifier (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
template<typename DataType >
void	addPropertyModifierWithoutNotifyingHandlers (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
	Adds a property modifier without notifying handlers. More...
template<typename DataType >
void	addPropertyNotificationHandler (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::NotificationCallback callback, void *owner)
template<typename DataType >
void	addPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, PropertyValuePrecedence precedence, void *ownerPointer)
template<typename DataType >
void	addPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, PropertyValuePrecedence precedence, AbstractPropertyTypeDescriptor::ValueSourceOwner *owner)
PropertyStorageContainer::iterator	beginPropertyStorage ()
	Returns the begin iterator to the internal property storage container. More...
PropertyStorageContainer::const_iterator	beginPropertyStorage () const
	Returns the begin iterator to the internal property storage container. More...
void	clearPropertyFlag (AbstractPropertyType propertyType, uint32_t flag)
void	copyLocalValue (const PropertyObject &other, AbstractPropertyType propertyType)
	Copies local value of single property from another object. More...
void	copyLocalValues (const PropertyObject &other)
	Copies all local values from another object. More...
PropertyStorageContainer::iterator	endPropertyStorage ()
	Returns the end iterator to the internal property storage container. More...
PropertyStorageContainer::const_iterator	endPropertyStorage () const
	Returns the end iterator to the internal property storage container. More...
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType	getAbstractProperty (AbstractPropertyType abstractPropertyType) const
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType	getAbstractPropertyBase (AbstractPropertyType abstractPropertyType) const
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType >	getOptionalAbstractProperty (AbstractPropertyType abstractPropertyType) const
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType >	getOptionalProperty (const PropertyType< DataType > &propertyType) const
	Evaluates the property value in the same way as the overload above but does not default to the value in property metadata if there are no inputs to the property value. More...
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType >	getOptionalPropertyBase (const PropertyType< DataType > &propertyType) const
	Returns the current value of a property disregarding modifiers, but does not default to the value in property metadata if there are no inputs to the property value. More...
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType	getProperty (const PropertyType< DataType > &propertyType) const
	Returns the current value of a property type. More...
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType	getPropertyBase (const PropertyType< DataType > &propertyType) const
	Returns the current value of a property disregarding modifiers. More...
template<typename DataType >
size_t	getPropertyNotificationHandlerCount (const PropertyType< DataType > &propertyType) const
	Gets number of current notification handlers for given property type. More...
bool	hasBaseValue (AbstractPropertyType propertyType) const
	Evaluates whether there are any inputs into the property value, disregarding modifiers. More...
bool	hasLocalValue (AbstractPropertyType propertyType) const
	Evaluates whether there is a local value set for the property. More...
bool	hasNonClassValue (AbstractPropertyType propertyType) const
	Evaluates whether there is a value of any precedence higher than class default value set for the property. More...
bool	hasValue (AbstractPropertyType propertyType) const
	Evaluates whether there are any inputs into the property value. More...
bool	isPropertyFlagSet (AbstractPropertyType propertyType, uint32_t flag) const
virtual void	onPropertyChanged (AbstractPropertyType propertyType, PropertyNotificationReason reason)
	Virtual function to handle property change notifications. More...
	PropertyObject ()
void	removeKzbProperties (flat_set< AbstractPropertyType > *keepProperties)
	Remove all KZB properties that are not included in a given set. More...
void	removeKzbProperties ()
	Remove all KZB properties. More...
template<typename DataType >
void	removeLocalPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, void *ownerPointer)
void	removeLocalValue (AbstractPropertyType propertyType)
	Removes the local value associated with the property. More...
template<typename DataType >
void	removePropertyModifier (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
template<typename DataType >
void	removePropertyNotificationHandler (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::NotificationCallback callback, void *owner)
template<typename DataType >
void	removePropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, void *ownerPointer)
template<typename DataType >
void	setAbstractProperty (AbstractPropertyType abstractPropertyType, typename PropertyType< DataType >::Traits::ParameterType value)
template<typename DataType >
void	setProperty (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Traits::ParameterType value)
	Sets the local value of a property type. More...
void	setPropertyFlag (AbstractPropertyType propertyType, uint32_t flag)
KZ_DEPRECATED void	validatePropertyModifiers (AbstractPropertyType propertyType)
	Validates property modifiers and notifies handlers. More...
void	validatePropertyModifiersAndNotifyHandlers (AbstractPropertyType propertyType)
	Validates property modifiers and notifies handlers. More...
virtual	~PropertyObject ()

Static Public Member Functions
static DataObjectSharedPtr	create (Domain *domain, string_view name)
	Create a DataObject. More...
Static Public Member Functions inherited from kanzi::DataContext
static PropertyTypeEditorInfoSharedPtr	makeEditorInfo ()
static ResourceSharedPtr	getDataContext (const Node &node)
	Gets the value of DataContextProperty. More...
static void	setDataContext (Node &node, ResourceSharedPtr value)
	Sets the value of DataContextProperty. More...
static ResourceSharedPtr	getItemsSource (const Node &node)
	Gets the value of ItemsSourceProperty. More...
static void	setItemsSource (Node &node, ResourceSharedPtr value)
	Sets the value of ItemsSourceProperty. More...
Static Public Member Functions inherited from kanzi::Object
static const Metaclass *	getStaticMetaclass ()
	Returns the metaclass of Object class. More...
static PropertyTypeEditorInfoSharedPtr	makeEditorInfo ()
	Default implementation that returns empty editor info. More...
Static Public Member Functions inherited from kanzi::MetaObject
static const Metaclass *	getStaticMetaclass ()
	Returns the metaclass of Object class. More...
static PropertyTypeEditorInfoSharedPtr	makeEditorInfo ()
	Default implementation that returns empty editor info. More...

Protected Member Functions
	DataObject (Domain *domain, string_view name)
	Standard constructor. More...
Protected Member Functions inherited from kanzi::DataContext
	DataContext (Domain *domain, string_view name)
	Protected standard constructor. More...
Protected Member Functions inherited from kanzi::Resource
virtual unsigned int	getCPUMemoryUsageOverride () const
virtual void	reloadFromFileOverride (string_view filePath)
virtual void	reloadFromKzbOverride (KzbFile &kzbFile, ReadOnlyMemoryFile &file, KzbMemoryParser &parser)
virtual void	reloadOverride ()
	Resource (Domain *domain, string_view name)
	Constructor. More...
Protected Member Functions inherited from kanzi::Object
void	initialize ()
void	onCopy (const Object &other)
Protected Member Functions inherited from kanzi::MetaObject
void	initialize ()
	MetaObject ()
Protected Member Functions inherited from kanzi::PropertyObject
AbstractPropertyTypeDescriptor::ValueSourceEntry *	acquireLocalValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor, PropertyStoragePtr &propertyStorage)
	Acquires a local value source entry that is free for the assignment of a value. More...
AbstractPropertyTypeDescriptor::ModifierStorage *	acquireModifierStorage (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
AbstractPropertyTypeDescriptor::NotificationStorage *	acquireNotificationStorage (AbstractPropertyTypeDescriptor &descriptor)
PropertyStoragePtr	acquirePropertyStorage (AbstractPropertyTypeDescriptor &descriptor)
template<typename DataType >
void	addPropertyModifierBase (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner, bool notify)
	Adds a property modifier entry to the property modifier stack and validates them. More...
void	addPropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, PropertyValuePrecedence precedence, void *ownerPointer)
	Internally adds a property value source. More...
void	addPropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, PropertyValuePrecedence precedence, AbstractPropertyTypeDescriptor::ValueSourceOwner *owner)
	Internally adds a property value source. More...
AbstractPropertyTypeDescriptor::ValueSourceEntry *	constructLocalValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
PropertyStoragePtr	constructPropertyStorage (AbstractPropertyTypeDescriptor &descriptor)
void	copyLocalValue (const AbstractPropertyTypeDescriptor::PropertyStorage &otherPropertyStorage)
	Copy local value from property storage. More...
AbstractPropertyTypeDescriptor::ModifierStorage *	findModifierStorage (AbstractPropertyTypeDescriptor &descriptor)
AbstractPropertyTypeDescriptor::NotificationStorage *	findNotificationStorage (AbstractPropertyTypeDescriptor &descriptor) const
AbstractPropertyTypeDescriptor::PropertyStorage *	findPropertyStorage (AbstractPropertyTypeDescriptor &descriptor) const
	Gets the property storage for given property type descriptor. More...
PropertyStoragePtr	findPropertyStoragePtr (AbstractPropertyTypeDescriptor &descriptor) const
	Gets property storage intrusive pointer which you can use to hold a reference until the end of the operation. More...
AbstractPropertyTypeDescriptor *	findPropertyTypeDescriptorByNameAndDataType (string_view name, PropertyDataType dataType) const
	Finds a property type descriptor by name and data type. More...
AbstractPropertyTypeDescriptor *	findPropertyTypeDescriptorByQualifiedNameAndDataType (string_view qualifiedName, PropertyDataType dataType) const
	Like findPropertyTypeDescriptorByNameAndDataType, but only searches by matching with qualified names. More...
AbstractPropertyTypeDescriptor *	findPropertyTypeDescriptorByUnqualifiedNameAndDataType (string_view unqualifiedName, PropertyDataType dataType) const
	Like findPropertyTypeDescriptorByNameAndDataType, but only searches by matching with unqualified names. More...
AbstractPropertyTypeDescriptor::ValueSource *	getClassValueSource (AbstractPropertyTypeDescriptor &descriptor) const
AbstractPropertyTypeDescriptor::ValueSource *	getFinalValueSource (AbstractPropertyTypeDescriptor &descriptor) const
AbstractPropertyTypeDescriptor::ValueSource *	getNonClassValueSource (AbstractPropertyTypeDescriptor &descriptor) const
AbstractPropertyTypeDescriptor::ValueSource *	getTopValueSource (AbstractPropertyTypeDescriptor &descriptor) const
	Gets the top-level value source for a given property descriptor. More...
virtual void	notifyPropertyHandlers (PropertyStoragePtr &storagePtr, PropertyNotificationReason reason)
	Notifies all property handlers on a property storage. More...
void	onCopy (const PropertyObject &other)
void	removeLocalValue (AbstractPropertyTypeDescriptor &descriptor, PropertyStoragePtr &propertyStorage)
	Removes a local value from the given property storage. More...
void	removePropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, void *owner)
	Removes a property value source. More...
void	validatePropertyModifiers (PropertyStoragePtr &propertyStorage)
	Validates property modifiers without notifying handlers. More...
void	validatePropertyModifiersAndNotifyHandlers (PropertyStoragePtr &propertyStorage)
	Validates property modifiers and notifies handlers. More...

Additional Inherited Members
Static Public Attributes inherited from kanzi::DataContext
static PropertyType< ResourceSharedPtr >	DataContextProperty
	DataContext property. More...
static PropertyType< ResourceSharedPtr >	ItemsSourceProperty
	ItemsSource property. More...
Protected Types inherited from kanzi::DataContext
typedef vector< ModifiedSubscriptionSharedPtr >	ModifiedSubscriptionContainer
	Container for subscriptions. More...
typedef shared_ptr< ModifiedSubscription >	ModifiedSubscriptionSharedPtr
	Subscription shared pointer type. More...
Protected Types inherited from kanzi::Object
typedef vector< AppliedStyleEntrySharedPtr >	AppliedStyleContainer
	Applied style container. More...
Protected Attributes inherited from kanzi::DataContext
unsigned int	m_notificationPassGuard
	Notification pass guard integer for triggering removal at end. More...
ModifiedSubscriptionContainer	m_subscriptions
	Subscriptions to data context being modified. More...
Protected Attributes inherited from kanzi::Object
AppliedStyleContainer	m_appliedStyles
	Listing of applied styles applied to this object. More...

Detailed Description

DataObject is the base class for data.

All data within the data source is described as a tree of data objects. The base class provides support for the hierarchy as the derived classes provide support for different value types.

Member Typedef Documentation

typedef vector<DataObjectSharedPtr> kanzi::DataObject::ChildContainer

typedef ChildContainer::const_iterator kanzi::DataObject::ChildConstIterator

typedef ChildContainer::const_reverse_iterator kanzi::DataObject::ChildConstReverseIterator

Member Enumeration Documentation

enum kanzi::DataObject::Type

Type enumerations for different data object types.

Enumerator
Object
Integer
Real
Bool
String
Enum
List

Constructor & Destructor Documentation

kanzi::DataObject::DataObject ( Domain *  domain, string_view  name  )

explicitprotected

Standard constructor.

Parameters

domain	The UI domain.
name	Name of the data object.

Member Function Documentation

static DataObjectSharedPtr kanzi::DataObject::create ( Domain *  domain, string_view  name  )

inlinestatic

Create a DataObject.

Parameters

domain	The UI domain.
name	Name of the data object.

Returns

DataObject shared ptr.

string kanzi::DataObject::getName

(

)

const

Allows to retrieve the name of the object.

Returns

Returns the name of the object.

void kanzi::DataObject::setName

(

string_view

value

)

Sets the name of the object.

Parameters

value

New name that is assigned to object.

virtual Type kanzi::DataObject::getType ( ) const

inlinevirtual

Allows to retrieve the type of the object.

Returns

Type enumeration of the object.

Reimplemented in kanzi::DataObjectTyped< DataType, DataTypeEnum >, kanzi::DataObjectTyped< double, DataObject::Real >, kanzi::DataObjectTyped< string, DataObject::String >, kanzi::DataObjectTyped< int32_t, DataObject::Integer >, kanzi::DataObjectTyped< bool, DataObject::Bool >, kanzi::DataObjectList, and kanzi::DataObjectEnumBase.

void kanzi::DataObject::setParent

(

DataObjectSharedPtr

parent

)

Assigns a parent DataObject to this DataObject.

Parameters

parent

The DataObject to set as the parent DataObject.

Since

Kanzi 3.9.0

DataObjectSharedPtr kanzi::DataObject::getParent

(

)

const

Retrieves the parent DataObject of this DataObject.

Returns

The parent DataObject of this DataObject.

Since

Kanzi 3.9.0

size_t kanzi::DataObject::getChildCount

(

)

const

Retrieves the count of child objects in this data object.

Returns

Child object count.

DataObjectSharedPtr kanzi::DataObject::getChild

(

size_t

index

)

const

Retrieves a child object in given index.

Returns

Child data object in given index.

size_t kanzi::DataObject::getChildIndex

(

const DataObject &

child

)

const

Retrieves the index of a child data object.

Returns

Index of the item in question, throws exception if there is no such child.

bool kanzi::DataObject::hasChild

(

const DataObject &

child

)

const

Checks whether or not the child exists.

Returns

true if there is such child, otherwise false.

void kanzi::DataObject::addChild

(

const DataObjectSharedPtr &

child

)

Adds data object as child of this object.

Parameters

child

Child object to add.

void kanzi::DataObject::insertChild	(	size_t	index,
		const DataObjectSharedPtr &	child
	)

Inserts data object as child of this object, allows to specify index of the object.

Parameters

index	Index where to add given object.
child	Child object to add.

void kanzi::DataObject::removeChild

(

const DataObject &

child

)

Removes a child object from the list of children.

Parameters

child

Child object to remove.

void kanzi::DataObject::removeChild

(

size_t

index

)

Removes a child object in given index.

Parameters

index

Index of the child object to remove.

void kanzi::DataObject::removeAllChildren

(

)

Removes all children.

ChildConstIterator kanzi::DataObject::beginChildren

(

)

const

Returns iterator to start of the child container.

Returns

Iterator at the beginning of the container.

ChildConstIterator kanzi::DataObject::endChildren

(

)

const

Returns iterator in the end of the child container.

Returns

Iterator in the end of the container.

DataObjectSharedPtr kanzi::DataObject::findChild

(

string_view

name

)

Tries to find a child with given name.

Returns

Child object that was found, or empty pointer if there is no such child.

DataObjectSharedPtr kanzi::DataObject::getData ( )

overridevirtual

DataContext interface.

Implements kanzi::DataContext.

DataContextSharedPtr kanzi::DataObject::lookupDataContext ( string_view  relativePath )

overridevirtual

Performs object look-up by path.

Parameters

relativePath

Path of the object where to look at, separated by '.'.

Returns

Data object that was found, or empty pointer if there was no such object.

Implements kanzi::DataContext.

virtual Variant kanzi::DataObject::readVariant ( )

inlinevirtual

Read data object contents into a variant.

Default implementation returns an empty variant.

Returns

Variant read.

Reimplemented in kanzi::DataObjectTyped< DataType, DataTypeEnum >, kanzi::DataObjectTyped< double, DataObject::Real >, kanzi::DataObjectTyped< string, DataObject::String >, kanzi::DataObjectTyped< int32_t, DataObject::Integer >, kanzi::DataObjectTyped< bool, DataObject::Bool >, kanzi::DataObjectList, and kanzi::DataObjectEnumBase.

---

The documentation for this class was generated from the following file:

• kanzi/core.ui/data/data_object.hpp