Struct gdk4_x11::X11Display

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#[repr(transparent)]
pub struct X11Display { /* private fields */ }

Expand description

Implementations

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Pops the error trap pushed by gdk_x11_display_error_trap_push(). Will XSync() if necessary and will always block until the error is known to have occurred or not occurred, so the error code can be returned.

If you don’t need to use the return value, gdk_x11_display_error_trap_pop_ignored() would be more efficient.

Returns

X error code or 0 on success

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pub fn error_trap_pop_ignored(&self)

Pops the error trap pushed by gdk_x11_display_error_trap_push(). Does not block to see if an error occurred; merely records the range of requests to ignore errors for, and ignores those errors if they arrive asynchronously.

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pub fn error_trap_push(&self)

Begins a range of X requests on @self for which X error events will be ignored. Unignored errors (when no trap is pushed) will abort the application. Use gdk_x11_display_error_trap_pop() or gdk_x11_display_error_trap_pop_ignored()to lift a trap pushed with this function.

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pub fn default_group(&self) -> Surface

Returns the default group leader surface for all toplevel surfaces on @self. This surface is implicitly created by GDK. See gdk_x11_surface_set_group().

Returns

The default group leader surface for @self

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pub fn egl_version(&self) -> Option<(i32, i32 )>

This is supported on crate feature v4_4 only.

Retrieves the version of the EGL implementation.

Returns

true if EGL is available

`major`

return location for the EGL major version

`minor`

return location for the EGL minor version

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pub fn glx_version(&self) -> Option<(i32, i32 )>

Retrieves the version of the GLX implementation.

Returns

true if GLX is available

`major`

return location for the GLX major version

`minor`

return location for the GLX minor version

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pub fn primary_monitor(&self) -> Monitor

Gets the primary monitor for the display.

The primary monitor is considered the monitor where the “main desktop” lives. While normal application surfaces typically allow the window manager to place the surfaces, specialized desktop applications such as panels should place themselves on the primary monitor.

If no monitor is the designated primary monitor, any monitor (usually the first) may be returned.

Returns

the primary monitor, or any monitor if no primary monitor is configured by the user

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pub fn screen(&self) -> X11Screen

Retrieves the X11Screen of the @self.

Returns

the X11Screen

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pub fn startup_notification_id(&self) -> GString

Gets the startup notification ID for a display.

Returns

the startup notification ID for @self

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pub fn user_time(&self) -> u32

Returns the timestamp of the last user interaction on @self. The timestamp is taken from events caused by user interaction such as key presses or pointer movements. See gdk_x11_surface_set_user_time().

Returns

the timestamp of the last user interaction

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pub fn grab(&self)

Call XGrabServer() on @self. To ungrab the display again, use gdk_x11_display_ungrab().

gdk_x11_display_grab()/gdk_x11_display_ungrab() calls can be nested.

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pub fn set_cursor_theme(&self, theme: Option<&str>, size: i32)

Sets the cursor theme from which the images for cursor should be taken.

If the windowing system supports it, existing cursors created with gdk::Cursor::from_name() are updated to reflect the theme change. Custom cursors constructed with gdk::Cursor::from_texture() will have to be handled by the application (GTK applications can learn about cursor theme changes by listening for change notification for the corresponding GtkSetting).

`theme`

the name of the cursor theme to use, or None to unset a previously set value

`size`

the cursor size to use, or 0 to keep the previous size

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pub fn set_startup_notification_id(&self, startup_id: &str)

Sets the startup notification ID for a display.

This is usually taken from the value of the DESKTOP_STARTUP_ID environment variable, but in some cases (such as the application not being launched using exec()) it can come from other sources.

If the ID contains the string “_TIME” then the portion following that string is taken to be the X11 timestamp of the event that triggered the application to be launched and the GDK current event time is set accordingly.

The startup ID is also what is used to signal that the startup is complete (for example, when opening a window or when calling gdk_display_notify_startup_complete()).

`startup_id`

the startup notification ID (must be valid utf8)

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pub fn set_surface_scale(&self, scale: i32)

Forces a specific window scale for all windows on this display, instead of using the default or user configured scale. This is can be used to disable scaling support by setting @scale to 1, or to programmatically set the window scale.

Once the scale is set by this call it will not change in response to later user configuration changes.

`scale`

The new scale value

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pub fn string_to_compound_text(&self, str: &str) -> (i32, GString, i32, Vec<u8>)

Convert a string from the encoding of the current locale into a form suitable for storing in a window property.

`str`

a nul-terminated string

Returns

0 upon success, non-zero upon failure

`encoding`

location to store the encoding (to be used as the type for the property)

`format`

location to store the format of the property

`ctext`

location to store newly allocated data for the property

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pub fn ungrab(&self)

Ungrab @self after it has been grabbed with gdk_x11_display_grab().

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pub fn utf8_to_compound_text(
&self,
str: &str
) -> Option<(GString, i32, Vec<u8>)>

Converts from UTF-8 to compound text.

`str`

a UTF-8 string

Returns

true if the conversion succeeded, otherwise false

`encoding`

location to store resulting encoding

`format`

location to store format of the result

`ctext`

location to store the data of the result

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pub fn open(display_name: Option<&str>) -> Option<Display>

Tries to open a new display to the X server given by @display_name. If opening the display fails, None is returned.

`display_name`

name of the X display. See the XOpenDisplay() for details.

Returns

The new display

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pub fn set_program_class(display: &impl IsA<Display>, program_class: &str)

Sets the program class.

The X11 backend uses the program class to set the class name part of the WM_CLASS property on toplevel windows; see the ICCCM.

`display`

a gdk::Display

`program_class`

a string

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impl X11Display

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pub fn egl_display(&self) -> Option<Display>

This is supported on crate features v4_4 and egl only.

Retrieves the EGL display connection object for the given GDK display.

This function returns NULL if GDK is using GLX.

Returns

the EGL display object

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pub fn xcursor(&self, cursor: &Cursor) -> XCursor

Returns the X cursor belonging to a gdk::Cursor, potentially creating the cursor.

Be aware that the returned cursor may not be unique to @cursor. It may for example be shared with its fallback cursor. On old X servers that don’t support the XCursor extension, all cursors may even fall back to a few default cursors.

`cursor`

a gdk::Cursor

Returns

an Xlib Cursor.

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pub fn xrootwindow(&self) -> XWindow

Returns the root X window used by gdk::Display.

Returns

an X Window

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pub unsafe fn xdisplay(&self) -> *mut Display

This is supported on crate feature xlib only.

Returns the X display of a gdk::Display.

Returns

an X display

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pub unsafe fn xscreen(&self) -> *mut Screen

This is supported on crate feature xlib only.

Returns the X Screen used by gdk::Display.

Returns

an X Screen

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pub unsafe fn connect_xevent<F: Fn(&Self, *mut XEvent) -> Continue + 'static>(
&self,
f: F
) -> SignalHandlerId

This is supported on crate feature xlib only.

The ::xevent signal is a low level signal that is emitted whenever an XEvent has been received.

When handlers to this signal return true, no other handlers will be invoked. In particular, the default handler for this function is GDK’s own event handling mechanism, so by returning true for an event that GDK expects to translate, you may break GDK and/or GTK+ in interesting ways. You have been warned.

If you want this signal handler to queue a gdk::Event, you can use gdk_display_put_event().

If you are interested in X GenericEvents, bear in mind that XGetEventData() has been already called on the event, and XFreeEventData() will be called afterwards.

`xevent`

a pointer to the XEvent to process

Returns

true to stop other handlers from being invoked for the event. false to propagate the event further.

Trait Implementations

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impl Clone for X11Display

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fn clone(&self) -> Self

Returns a copy of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Debug for X11Display

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl Display for X11Display

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl Hash for X11Display

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fn hash<H>(&self, state: &mut H) where
H: Hasher,

Feeds this value into the given Hasher. Read more

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fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,

Feeds a slice of this type into the given Hasher. Read more

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impl Ord for X11Display

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fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other. Read more

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fn max(self, other: Self) -> Self

Compares and returns the maximum of two values. Read more

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fn min(self, other: Self) -> Self

Compares and returns the minimum of two values. Read more

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fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval. Read more

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impl ParentClassIs for X11Display

type Parent = Display

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impl<OT: ObjectType> PartialEq<OT> for X11Display

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fn eq(&self, other: &OT) -> bool

This method tests for self and other values to be equal, and is used by ==. Read more

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fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

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impl<OT: ObjectType> PartialOrd<OT> for X11Display

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fn partial_cmp(&self, other: &OT) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more

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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more

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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more

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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

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impl StaticType for X11Display

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fn static_type() -> Type

Returns the type identifier of Self.

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impl Eq for X11Display

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impl IsA<Display> for X11Display

Auto Trait Implementations

impl RefUnwindSafe for X11Display

impl !Send for X11Display

impl !Sync for X11Display

impl Unpin for X11Display

impl UnwindSafe for X11Display

Blanket Implementations

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impl<T> Any for T where
T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> Cast for T where
T: ObjectType,

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fn upcast<T>(self) -> T where
T: ObjectType,
Self: IsA<T>,

Upcasts an object to a superclass or interface T. Read more

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fn upcast_ref<T>(&self) -> &T where
T: ObjectType,
Self: IsA<T>,

Upcasts an object to a reference of its superclass or interface T. Read more

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fn downcast<T>(self) -> Result<T, Self> where
T: ObjectType,
Self: CanDowncast<T>,

Tries to downcast to a subclass or interface implementor T. Read more

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fn downcast_ref<T>(&self) -> Option<&T> where
T: ObjectType,
Self: CanDowncast<T>,

Tries to downcast to a reference of its subclass or interface implementor T. Read more

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fn dynamic_cast<T>(self) -> Result<T, Self> where
T: ObjectType,

Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more

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fn dynamic_cast_ref<T>(&self) -> Option<&T> where
T: ObjectType,

Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more

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unsafe fn unsafe_cast<T>(self) -> T where
T: ObjectType,

Casts to T unconditionally. Read more

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unsafe fn unsafe_cast_ref<T>(&self) -> &T where
T: ObjectType,

Casts to &T unconditionally. Read more

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impl<O> DisplayExt for O where
O: IsA<Display>,

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fn beep(&self)

Emits a short beep on @self

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fn close(&self)

Closes the connection to the windowing system for the given display. Read more

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fn create_gl_context(&self) -> Result<GLContext, Error>

This is supported on crate feature v4_6 only.

Creates a new GLContext for the Display. Read more

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fn device_is_grabbed(&self, device: &impl IsA<Device>) -> bool

Returns true if there is an ongoing grab on @device for @self. Read more

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fn flush(&self)

Flushes any requests queued for the windowing system. Read more

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fn app_launch_context(&self) -> AppLaunchContext

Returns a AppLaunchContext suitable for launching applications on the given display. Read more

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fn clipboard(&self) -> Clipboard

Gets the clipboard used for copy/paste operations. Read more

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fn default_seat(&self) -> Option<Seat>

Returns the default Seat for this display. Read more

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fn monitor_at_surface(&self, surface: &impl IsA<Surface>) -> Monitor

Gets the monitor in which the largest area of @surface resides. Read more

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fn monitors(&self) -> ListModel

Gets the list of monitors associated with this display. Read more

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fn name(&self) -> GString

Gets the name of the display. Read more

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fn primary_clipboard(&self) -> Clipboard

Gets the clipboard used for the primary selection. Read more

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fn startup_notification_id(&self) -> Option<GString>

Gets the startup notification ID for a Wayland display, or None if no ID has been defined. Read more

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fn is_closed(&self) -> bool

Finds out if the display has been closed. Read more

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fn is_composited(&self) -> bool

Returns whether surfaces can reasonably be expected to have their alpha channel drawn correctly on the screen. Read more

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fn is_rgba(&self) -> bool

Returns whether surfaces on this @self are created with an alpha channel. Read more

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fn list_seats(&self) -> Vec<Seat, Global>

Returns the list of seats known to @self. Read more

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fn notify_startup_complete(&self, startup_id: &str)

Indicates to the GUI environment that the application has finished loading, using a given identifier. Read more

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fn prepare_gl(&self) -> Result<(), Error>

This is supported on crate feature v4_4 only.

Checks that OpenGL is available for @self and ensures that it is properly initialized. When this fails, an @error will be set describing the error and this function returns false. Read more

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fn put_event(&self, event: impl AsRef<Event>)

Appends the given event onto the front of the event queue for @self. Read more

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fn connect_closed<F>(&self, f: F) -> SignalHandlerId where
F: 'static + Fn(&O, bool),

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fn connect_opened<F>(&self, f: F) -> SignalHandlerId where
F: 'static + Fn(&O),

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fn connect_seat_added<F>(&self, f: F) -> SignalHandlerId where
F: 'static + Fn(&O, &Seat),

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fn connect_seat_removed<F>(&self, f: F) -> SignalHandlerId where
F: 'static + Fn(&O, &Seat),

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fn connect_setting_changed<F>(&self, f: F) -> SignalHandlerId where
F: 'static + Fn(&O, &str),

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fn connect_composited_notify<F>(&self, f: F) -> SignalHandlerId where
F: 'static + Fn(&O),

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fn connect_input_shapes_notify<F>(&self, f: F) -> SignalHandlerId where
F: 'static + Fn(&O),

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fn connect_rgba_notify<F>(&self, f: F) -> SignalHandlerId where
F: 'static + Fn(&O),

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impl<O> DisplayExtManual for O where
O: IsA<Display>,

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fn translate_key(
 &self,
 keycode: u32,
 state: ModifierType,
 group: i32
) -> Option<(Key, i32, i32, ModifierType )>

Translates the contents of a GdkEventKey into a keyval, effective group, and level. Read more

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fn get_setting(&self, name: &str) -> Option<Value>

Retrieves a desktop-wide setting such as double-click time for the @self. Read more

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fn map_keyval(&self, keyval: Key) -> Option<Vec<KeymapKey, Global>>

Obtains a list of keycode/group/level combinations that will generate @keyval. Read more

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fn map_keycode(&self, keycode: u32) -> Option<Vec<(KeymapKey, Key ), Global>>

Returns the keyvals bound to @keycode. Read more

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fn backend(&self) -> Backend

Get the currently used display backend

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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T where
U: From<T>,

const: unstable · source

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl IsSubclassableExt for U where
U: IsClass + ParentClassIs,

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fn parent_class_init<T>(class: &mut Class) where
T: ObjectSubclass,
::Parent: IsSubclassable<T>,

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fn parent_instance_init<T>(instance: &mut InitializingObject<T>) where
T: ObjectSubclass,
::Parent: IsSubclassable<T>,

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impl<T> ObjectExt for T where
T: ObjectType,

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fn is(&self) -> bool where
U: StaticType,

Returns true if the object is an instance of (can be cast to) T.

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fn type_(&self) -> Type

Returns the type of the object.

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fn object_class(&self) -> &Class<Object>

Returns the ObjectClass of the object. Read more

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fn class(&self) -> &Class<T> where
T: IsClass,

Returns the class of the object.

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fn class_of(&self) -> Option<&Class> where
U: IsClass,

Returns the class of the object in the given type T. Read more

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fn interface(&self) -> Option<InterfaceRef<'_, U>> where
U: IsInterface,

Returns the interface T of the object. Read more

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fn try_set_property<V>(
 &self,
 property_name: &str,
 value: V
) -> Result<(), BoolError> where
 V: ToValue,

Similar to Self::set_property but fails instead of panicking.

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fn set_property<V>(&self, property_name: &str, value: V) where
V: ToValue,

Sets the property property_name of the object to value value. Read more

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fn try_set_property_from_value(
 &self,
 property_name: &str,
 value: &Value
) -> Result<(), BoolError>

Similar to Self::set_property but fails instead of panicking.

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fn set_property_from_value(&self, property_name: &str, value: &Value)

Sets the property property_name of the object to value value. Read more

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fn try_set_properties(
&self,
property_values: &[(&str, &dyn ToValue )]
) -> Result<(), BoolError>

Similar to Self::set_properties but fails instead of panicking.

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fn set_properties(&self, property_values: &[(&str, &dyn ToValue )])

Sets multiple properties of the object at once. Read more

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fn try_set_properties_from_value(
&self,
property_values: &[(&str, Value )]
) -> Result<(), BoolError>

Similar to Self::set_properties_from_value but fails instead of panicking.

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fn set_properties_from_value(&self, property_values: &[(&str, Value )])

Sets multiple properties of the object at once. Read more

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fn try_property<V>(&self, property_name: &str) -> Result<V, BoolError> where
V: 'static + for<'b> FromValue<'b>,

Similar to Self::property but fails instead of panicking.

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fn property<V>(&self, property_name: &str) -> V where
V: 'static + for<'b> FromValue<'b>,

Gets the property property_name of the object and cast it to the type V. Read more

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fn try_property_value(&self, property_name: &str) -> Result<Value, BoolError>

Similar to Self::property_value but fails instead of panicking.

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fn property_value(&self, property_name: &str) -> Value

Gets the property property_name of the object. Read more

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fn has_property(&self, property_name: &str, type_: Option<Type>) -> bool

Check if the object has a property property_name of the given type_. Read more

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fn property_type(&self, property_name: &str) -> Option<Type>

Get the type of the property property_name of this object. Read more

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fn find_property(&self, property_name: &str) -> Option<ParamSpec>

Get the ParamSpec of the property property_name of this object.

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fn list_properties(&self) -> PtrSlice<ParamSpec>

Return all ParamSpec of the properties of this object.

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fn freeze_notify(&self) -> PropertyNotificationFreezeGuard

Freeze all property notifications until the return guard object is dropped. Read more

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unsafe fn set_qdata<QD>(&self, key: Quark, value: QD) where
QD: 'static,

Set arbitrary data on this object with the given key. Read more

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unsafe fn qdata<QD>(&self, key: Quark) -> Option<NonNull<QD>> where
QD: 'static,

Return previously set arbitrary data of this object with the given key. Read more

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unsafe fn steal_qdata<QD>(&self, key: Quark) -> Option<QD> where
QD: 'static,

Retrieve previously set arbitrary data of this object with the given key. Read more

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unsafe fn set_data<QD>(&self, key: &str, value: QD) where
QD: 'static,

Set arbitrary data on this object with the given key. Read more

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unsafe fn data<QD>(&self, key: &str) -> Option<NonNull<QD>> where
QD: 'static,

Return previously set arbitrary data of this object with the given key. Read more

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unsafe fn steal_data<QD>(&self, key: &str) -> Option<QD> where
QD: 'static,

Retrieve previously set arbitrary data of this object with the given key. Read more

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fn block_signal(&self, handler_id: &SignalHandlerId)

Block a given signal handler. Read more

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fn unblock_signal(&self, handler_id: &SignalHandlerId)

Unblock a given signal handler.

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fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)

Stop emission of the currently emitted signal.

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fn stop_signal_emission_by_name(&self, signal_name: &str)

Stop emission of the currently emitted signal by the (possibly detailed) signal name.

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fn try_connect<F>(
 &self,
 signal_name: &str,
 after: bool,
 callback: F
) -> Result<SignalHandlerId, BoolError> where
 F: 'static + Fn(&[Value ]) -> Option<Value> + Send + Sync,

Similar to Self::connect but fails instead of panicking.

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fn connect<F>(
 &self,
 signal_name: &str,
 after: bool,
 callback: F
) -> SignalHandlerId where
 F: 'static + Fn(&[Value ]) -> Option<Value> + Send + Sync,

Connect to the signal signal_name on this object. Read more

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fn try_connect_id<F>(
 &self,
 signal_id: SignalId,
 details: Option<Quark>,
 after: bool,
 callback: F
) -> Result<SignalHandlerId, BoolError> where
 F: 'static + Fn(&[Value ]) -> Option<Value> + Send + Sync,

Similar to Self::connect_id but fails instead of panicking.

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fn connect_id<F>(
 &self,
 signal_id: SignalId,
 details: Option<Quark>,
 after: bool,
 callback: F
) -> SignalHandlerId where
 F: 'static + Fn(&[Value ]) -> Option<Value> + Send + Sync,

Connect to the signal signal_id on this object. Read more

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fn try_connect_local<F>(
 &self,
 signal_name: &str,
 after: bool,
 callback: F
) -> Result<SignalHandlerId, BoolError> where
 F: 'static + Fn(&[Value ]) -> Option<Value>,

Similar to Self::connect_local but fails instead of panicking.

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fn connect_local<F>(
 &self,
 signal_name: &str,
 after: bool,
 callback: F
) -> SignalHandlerId where
 F: 'static + Fn(&[Value ]) -> Option<Value>,

Connect to the signal signal_name on this object. Read more

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fn try_connect_local_id<F>(
 &self,
 signal_id: SignalId,
 details: Option<Quark>,
 after: bool,
 callback: F
) -> Result<SignalHandlerId, BoolError> where
 F: 'static + Fn(&[Value ]) -> Option<Value>,

Similar to Self::connect_local_id but fails instead of panicking.

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fn connect_local_id<F>(
 &self,
 signal_id: SignalId,
 details: Option<Quark>,
 after: bool,
 callback: F
) -> SignalHandlerId where
 F: 'static + Fn(&[Value ]) -> Option<Value>,

Connect to the signal signal_id on this object. Read more

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unsafe fn try_connect_unsafe<F>(
 &self,
 signal_name: &str,
 after: bool,
 callback: F
) -> Result<SignalHandlerId, BoolError> where
 F: Fn(&[Value ]) -> Option<Value>,

Similar to Self::connect_unsafe but fails instead of panicking.

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unsafe fn connect_unsafe<F>(
 &self,
 signal_name: &str,
 after: bool,
 callback: F
) -> SignalHandlerId where
 F: Fn(&[Value ]) -> Option<Value>,

Connect to the signal signal_name on this object. Read more

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unsafe fn try_connect_unsafe_id<F>(
 &self,
 signal_id: SignalId,
 details: Option<Quark>,
 after: bool,
 callback: F
) -> Result<SignalHandlerId, BoolError> where
 F: Fn(&[Value ]) -> Option<Value>,

Similar to Self::connect_unsafe_id but fails instead of panicking.

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fn try_connect_closure(
 &self,
 signal_name: &str,
 after: bool,
 closure: RustClosure
) -> Result<SignalHandlerId, BoolError>

Similar to Self::connect_closure but fails instead of panicking.

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fn connect_closure(
    &self,
    signal_name: &str,
    after: bool,
    closure: RustClosure
) -> SignalHandlerId

Connect a closure to the signal signal_name on this object. Read more

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fn try_connect_closure_id(
 &self,
 signal_id: SignalId,
 details: Option<Quark>,
 after: bool,
 closure: RustClosure
) -> Result<SignalHandlerId, BoolError>

Similar to Self::connect_closure_id but fails instead of panicking.

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fn connect_closure_id(
 &self,
 signal_id: SignalId,
 details: Option<Quark>,
 after: bool,
 closure: RustClosure
) -> SignalHandlerId

Connect a closure to the signal signal_id on this object. Read more

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fn watch_closure(&self, closure: &impl AsRef<Closure>)

Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to Closure::invoke. Read more

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