Gtk::ClosureExpression< T > Class Template Reference

#include <gtkmm/expression.h>

Inheritance diagram for Gtk::ClosureExpression< T >:

Static Public Member Functions
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system.
template<class S , class... ATs>
static Glib::RefPtr< ClosureExpression< T > >	create (S slot, const Glib::RefPtr< ATs > &... params)
	Creates a Gtk::Expression that calls slot when it is evaluated.

Additional Inherited Members
Public Types inherited from Gtk::Expression< T >
using	ValueType = T
Public Types inherited from Gtk::ExpressionBase
using	SlotNotify = sigc::slot< void()>
	For instance: void on_notify();.
Public Member Functions inherited from Gtk::Expression< T >
std::optional< T >	evaluate (const Glib::RefPtr< Glib::ObjectBase > &this_)
	Evaluates the given expression and on success returns the result.
Glib::RefPtr< ExpressionWatch< T > >	watch (const Glib::RefPtr< Glib::ObjectBase > &this_, const SlotNotify &notify)
	Installs a watch for the expression that calls the notify function whenever the evaluation of the expression may have changed.
template<class T2 >
Glib::RefPtr< ExpressionWatch< T > >	bind (const Glib::PropertyProxy< T2 > &property, const Glib::RefPtr< Glib::ObjectBase > &this_=nullptr)
	Bind a target's property to the expression.
template<class T2 >
Glib::RefPtr< ExpressionWatch< T > >	bind (const Glib::PropertyProxy_WriteOnly< T2 > &property, const Glib::RefPtr< Glib::ObjectBase > &this_=nullptr)
	Bind a target's property to the expression.
Public Member Functions inherited from Gtk::ExpressionBase
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 inherited from Gtk::ExpressionBase
void	operator delete (void *, std::size_t)
Related Symbols inherited from Gtk::ExpressionBase
Glib::RefPtr< Gtk::ExpressionBase >	wrap (GtkExpression *object, bool take_copy=false)
	A Glib::wrap() method for this object.

Member Function Documentation

create()

template <class T >

template <class S , class... ATs>

static Glib::RefPtr< ClosureExpression< T > > Gtk::ClosureExpression< T >::create ( S  slot, const Glib::RefPtr< ATs > &...  params  )

static

Creates a Gtk::Expression that calls slot when it is evaluated.

slot is called with the this object and the results of evaluating the params expressions.

Example:

Glib::ustring get_string(Glib::RefPtr<Glib::ObjectBase> this_, double a, int b)
{
  return Glib::ustring::sprintf("a is %f, b is %d", a, b);
}
 
Glib::RefPtr<Gtk::Expression<double>> expr1 = ...
Glib::RefPtr<Gtk::Expression<int>> expr2 = ...
 
Glib::RefPtr<Gtk::Expression<Glib::ustring>> expr3 =
  Gtk::ClosureExpression<Glib::ustring>::create(
    sigc::ptr_fun(get_string), expr1, expr2);

Parameters

slot	Slot to call when evaluating this expression.
params	Expressions for each parameter.

Returns

A new Gtk::Expression.

get_type()

template <class T >

static GType Gtk::ClosureExpression< T >::get_type ( )

static

Get the GType for this class, for use with the underlying GObject type system.