sigc::track_object() tracks trackable objects, referenced from a functor. More...

Classes
class	sigc::track_obj_functor< T_functor, T_obj >
	track_obj_functor wraps a functor and stores a reference to a trackable object. More...

Functions
template<typename T_functor , typename... T_obj>
decltype(auto)	sigc::track_obj (const T_functor & func, const T_obj &... obj)
	Creates an adaptor of type sigc::track_obj_functor which wraps a functor. More...

template<typename T_functor , typename T_obj1 , typename... T_objs>
decltype(auto)	sigc::track_object (const T_functor & func, const T_obj1 & obj1, const T_objs &... objs)
	Creates an adaptor of type sigc::track_obj_functor which wraps a functor. More...

Detailed Description

sigc::track_object() tracks trackable objects, referenced from a functor.

It can be useful when you assign a C++11 lambda expression or a std::function<> to a slot, or connect it to a signal, and the lambda expression or std::function<> contains references to sigc::trackable derived objects.

The functor returned by sigc::track_object() is formally an adaptor, but it does not alter the signature, return type or behaviour of the supplied functor.

track_obj() is a deprecated alternative to track_object().

Example:: struct bar : public sigc::trackable {};

sigc::signal<void()> some_signal;

void foo(bar&);

{

bar some_bar;

some_signal.connect([&some_bar](){ foo(some_bar); });

// NOT disconnected automatically when some_bar goes out of scope

some_signal.connect(sigc::track_object([&some_bar](){ foo(some_bar); }, some_bar);

// disconnected automatically when some_bar goes out of scope

}

sigc::track_object
decltype(auto) track_object(const T_functor &func, const T_obj1 &obj1, const T_objs &... objs)
Creates an adaptor of type sigc::track_obj_functor which wraps a functor.
Definition: track_obj.h:163

sigc::trackable
Base class for objects with auto-disconnection.
Definition: trackable.h:118

Function Documentation

◆ track_obj()

template <typename T_functor , typename... T_obj>

decltype(auto) sigc::track_obj	(	const T_functor &	func,
		const T_obj &...	obj
	)

inline

Creates an adaptor of type sigc::track_obj_functor which wraps a functor.

Parameters

func	Functor that shall be wrapped.
obj	Trackable objects.

Returns: Adaptor that executes func() on invocation.

Since libsigc++ 2.4:

Deprecated:: Use sigc::track_object() instead.

◆ track_object()

template <typename T_functor , typename T_obj1 , typename... T_objs>

decltype(auto) sigc::track_object	(	const T_functor &	func,
		const T_obj1 &	obj1,
		const T_objs &...	objs
	)