Gtk::ExpressionBase Class Reference

Base class for Gtk::Expression. More...

#include <gtkmm/expression.h>

Inheritance diagram for Gtk::ExpressionBase:

Public Types
using	SlotNotify = sigc::slot< void()>
	For instance: void on_notify();.

Public Member Functions
void	reference () const
	Increment the reference count for this object.
void	unreference () const
	Decrement the reference count for this object.
GtkExpression *	gobj ()
	Provides access to the underlying C instance.
const GtkExpression *	gobj () const
	Provides access to the underlying C instance.
GtkExpression *	gobj_copy () const
	Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
	ExpressionBase ()=delete
	ExpressionBase (const ExpressionBase &)=delete
ExpressionBase &	operator= (const ExpressionBase &)=delete
GType	get_value_type () const
	Gets the GType that this expression evaluates to.
bool	is_static () const
	Checks if the expression is static.

Protected Member Functions
void	operator delete (void *, std::size_t)

Related Functions
(Note that these are not member functions.)
Glib::RefPtr< Gtk::ExpressionBase >	wrap (GtkExpression * object, bool take_copy=false)
	A Glib::wrap() method for this object.

Detailed Description

Base class for Gtk::Expression.

See also

Gtk::Expression

Since gtkmm 3.98:

Member Typedef Documentation

SlotNotify

using Gtk::ExpressionBase::SlotNotify = sigc::slot<void()>

For instance: void on_notify();.

Callback called by Gtk::Expression::watch() when the expression value changes.

Constructor & Destructor Documentation

ExpressionBase() [1/2]

Gtk::ExpressionBase::ExpressionBase ( )

delete

ExpressionBase() [2/2]

Gtk::ExpressionBase::ExpressionBase ( const ExpressionBase &  )

delete

Member Function Documentation

get_value_type()

GType Gtk::ExpressionBase::get_value_type

(

)

const

Gets the GType that this expression evaluates to.

This type is constant and will not change over the lifetime of this expression.

Returns

The type returned from Gtk::Expression::evaluate().

gobj() [1/2]

GtkExpression * Gtk::ExpressionBase::gobj

(

)

Provides access to the underlying C instance.

gobj() [2/2]

const GtkExpression * Gtk::ExpressionBase::gobj

(

)

const

Provides access to the underlying C instance.

gobj_copy()

GtkExpression * Gtk::ExpressionBase::gobj_copy

(

)

const

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

is_static()

bool Gtk::ExpressionBase::is_static

(

)

const

Checks if the expression is static.

A static expression will never change its result when Gtk::Expression::evaluate() is called on it with the same arguments.

That means a call to Gtk::Expression::watch() is not necessary because it will never trigger a notify.

Returns

true if the expression is static.

operator delete()

void Gtk::ExpressionBase::operator delete ( void *  , std::size_t    )

protected

operator=()

ExpressionBase & Gtk::ExpressionBase::operator= ( const ExpressionBase &  )

delete

reference()

void Gtk::ExpressionBase::reference

(

)

const

Increment the reference count for this object.

You should never need to do this manually - use the object via a RefPtr instead.

unreference()

void Gtk::ExpressionBase::unreference

(

)

const

Decrement the reference count for this object.

You should never need to do this manually - use the object via a RefPtr instead.

Friends And Related Function Documentation

wrap()

Glib::RefPtr< Gtk::ExpressionBase > wrap ( GtkExpression *  object, bool  take_copy = false  )

related

A Glib::wrap() method for this object.

Parameters

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns

A C++ instance that wraps this C instance.