sigc::trackable Struct Reference

Base class for objects with auto-disconnection. More...

#include <sigc++/trackable.h>

Inheritance diagram for sigc::trackable:

Public Types
using	func_destroy_notify = internal::func_destroy_notify
Public Types inherited from sigc::notifiable
using	func_destroy_notify = internal::func_destroy_notify

Public Member Functions
	trackable () noexcept
	trackable (const trackable &src) noexcept
	trackable (trackable &&src) noexcept
	~trackable ()
void	add_destroy_notify_callback (notifiable *data, func_destroy_notify func) const
	Add a callback that is executed (notified) when the trackable object is detroyed.
void	notify_callbacks ()
	Execute and remove all previously installed callbacks.
trackable &	operator= (const trackable &src)
trackable &	operator= (trackable &&src) noexcept
void	remove_destroy_notify_callback (notifiable *data) const
	Remove a callback previously installed with add_destroy_notify_callback().

Detailed Description

Base class for objects with auto-disconnection.

trackable must be inherited when objects shall automatically invalidate slots referring to them on destruction. A slot built from a member function of a trackable derived type installs a callback that is invoked when the trackable object is destroyed or overwritten.

add_destroy_notify_callback() and remove_destroy_notify_callback() can be used to manually install and remove callbacks when notification of the object dying is needed.

notify_callbacks() invokes and removes all previously installed callbacks and can therefore be used to disconnect from all signals.

Note that there is no virtual destructor. Don't use trackable* as pointer type for managing your data or the destructors of your derived types won't be called when deleting your objects.

Member Typedef Documentation

func_destroy_notify

using sigc::trackable::func_destroy_notify = internal::func_destroy_notify

Constructor & Destructor Documentation

trackable() [1/3]

sigc::trackable::trackable ( )

noexcept

trackable() [2/3]

sigc::trackable::trackable ( const trackable &  src )

noexcept

trackable() [3/3]

sigc::trackable::trackable ( trackable &&  src )

noexcept

~trackable()

sigc::trackable::~trackable

(

)

Member Function Documentation

add_destroy_notify_callback()

void sigc::trackable::add_destroy_notify_callback	(	notifiable *	data,
		func_destroy_notify	func
	)		const

Add a callback that is executed (notified) when the trackable object is detroyed.

Parameters

data	Passed into func upon notification.
func	Callback executed upon destruction of the object.

notify_callbacks()

void sigc::trackable::notify_callbacks

(

)

Execute and remove all previously installed callbacks.

operator=() [1/2]

trackable & sigc::trackable::operator=

(

const trackable &

src

)

operator=() [2/2]

trackable & sigc::trackable::operator= ( trackable &&  src )

noexcept

remove_destroy_notify_callback()

void sigc::trackable::remove_destroy_notify_callback

(

notifiable *

data

)

const

Remove a callback previously installed with add_destroy_notify_callback().

The callback is not executed.

Parameters

data	Parameter passed into previous call to add_destroy_notify_callback().