Gtk::TryExpression< T > Class Template Reference

A Gtk::Expression that tries to evaluate each of its expressions until it succeeds. More...

#include <gtkmm/expression.h>

Inheritance diagram for Gtk::TryExpression< T >:

Static Public Member Functions
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system.
static Glib::RefPtr< TryExpression >	create (const std::vector< Glib::RefPtr< Expression< T > > > &expressions)
	Creates an expression with a vector of expressions.

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.

Detailed Description

template<class T>
class Gtk::TryExpression< T >

A Gtk::Expression that tries to evaluate each of its expressions until it succeeds.

If all expressions fail to evaluate, the Gtk::TryExpression's evaluation fails as well.

Since gtkmm 4.22:

Member Function Documentation

create()

template <class T >

static Glib::RefPtr< TryExpression > Gtk::TryExpression< T >::create ( const std::vector< Glib::RefPtr< Expression< T > > > &  expressions )

static

Creates an expression with a vector of expressions.

When evaluated, the Gtk::TryExpression tries to evaluate each of its expressions until it succeeds. If all expressions fail to evaluate, the Gtk::TryExpression's evaluation fails as well.

Parameters

expressions

A vector of Gtk::Expressions. The value type of the expressions in the vector must match.

Returns

A new Gtk::TryExpression. If expressions is an empty vector, or contains only empty RefPtrs, or the value types don't match, an empty RefPtr is returned.

Since gtkmm 4.22:

get_type()

template <class T >

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

static

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

Since gtkmm 4.22: