Value< T > Class Template Reference

Manages a single value. More...

#include <value.h>

Inheritance diagram for Value< T >:

Public Member Functions
	Value (T value={}) noexcept
	operator T () const
	Get the current value.
Value< T > &	operator= (T value)
	Assign new value.
T	value () const
	Get the current value.
bool	value (T value)
	Set value.
Public Member Functions inherited from Object
	Object () noexcept=default
	Object (const Object &)=delete
	Object (Object &&)=default
virtual	~Object () noexcept=default
void	clear_handlers ()
	Clear all registered event handlers.
void	invoke_handlers (Event &event)
	Invoke all handlers with the specified event.
void	invoke_handlers (EventId event)
	Invoke all handlers with the specified EventId.
EGT_NODISCARD const std::string &	name () const
	Get the name of the Object.
void	name (const std::string &name)
	Set the name of the Object.
RegisterHandle	on_event (const EventCallback &handler, const FilterFlags &mask={})
	Add an event handler to be called when the widget generates an event.
Object &	operator= (const Object &)=delete
Object &	operator= (Object &&)=default
void	remove_handler (RegisterHandle handle)
	Remove an event handler.

Public Attributes
Signal	on_value_changed
	Event signal.

Protected Attributes
T	m_value {}
	The current value.
Protected Attributes inherited from Object
detail::CopyOnWriteAllocate< CallbackArray >	m_callbacks
	Array of callbacks.
RegisterHandle	m_handle_counter {0}
	Counter used to generate unique handles for each callback registration.
std::string	m_name
	A user defined name for the Object.

Additional Inherited Members
Public Types inherited from Object
using	EventCallback = std::function< void(Event &event)>
	Event handler callback function.
using	FilterFlags = FlagsBase< EventId >
	Event handler EventId filter.
using	RegisterHandle = uint64_t
	Handle type.
Protected Types inherited from Object
using	CallbackArray = std::vector< CallbackMeta >
	Helper type for an array of callbacks.

Detailed Description

template<class T>
class egt::v1::Value< T >

Manages a single value.

Constructor & Destructor Documentation

Value()

template<class T >

Value ( T  value = {} )

inlineexplicitnoexcept

Parameters

[in]

value

Current value.

Member Function Documentation

operator T()

template<class T >

operator T ( ) const

inlineexplicit

Get the current value.

operator=()

template<class T >

Value< T > & operator= ( T  value )

inline

Assign new value.

value() [1/2]

template<class T >

T value ( ) const

inline

Get the current value.

value() [2/2]

template<class T >

bool value ( T  value )

inline

Set value.

Parameters

[in]

value

Value to set.

Returns

true if changed.

Member Data Documentation

m_value

template<class T >

T m_value {}

protected

The current value.

on_value_changed

template<class T >

Signal on_value_changed

Event signal.

Invoked when the value changes.