gtkmm 4.18.0
Gtk::ClosureExpression< T > Class Template Referencefinal

#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
ExpressionBaseoperator= (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)

Member Function Documentation

◆ create()

template <class T>
template <class S, class... ATs>
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 =
sigc::ptr_fun(get_string), expr1, expr2);
static Glib::RefPtr< ClosureExpression< T > > create(S slot, const Glib::RefPtr< ATs > &... params)
Creates a Gtk::Expression that calls slot when it is evaluated.
Expressions to values.
Definition expression.h:173
Parameters
slotSlot to call when evaluating this expression.
paramsExpressions for each parameter.
Returns
A new Gtk::Expression.

◆ get_type()

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

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