Struct glib::object::WeakRef

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pub struct WeakRef<T: ObjectType>(_, _);
Expand description

A weak reference to an object.

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impl<T: ObjectType> WeakRef<T>

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pub fn new() -> WeakRef<T>

Create a new empty weak reference.

upgrade will always return None until an object is set on it.

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pub fn set(&self, obj: Option<&T>)

Set this weak reference to the given object.

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pub fn upgrade(&self) -> Option<T>

Try to upgrade this weak reference to a strong reference.

If the stored object was already destroyed or no object was set in this weak reference then None is returned.

Trait Implementations§

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impl<T: ObjectType> Clone for WeakRef<T>

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fn clone(&self) -> Self

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
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impl<T: Debug + ObjectType> Debug for WeakRef<T>

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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<T: ObjectType> Default for WeakRef<T>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<T: ObjectType> Drop for WeakRef<T>

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<T: ObjectType> From<WeakRef<T>> for SendWeakRef<T>

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fn from(v: WeakRef<T>) -> SendWeakRef<T>

Converts to this type from the input type.
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impl<T: Downgrade + ObjectType> Upgrade for WeakRef<T>

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type Strong = T

Strong reference type.
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fn upgrade(&self) -> Option<Self::Strong>

Try upgrading a weak reference to a strong reference.
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impl<T: ObjectType + Send + Sync> Send for WeakRef<T>

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impl<T: ObjectType + Sync> Sync for WeakRef<T>

Auto Trait Implementations§

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impl<T> RefUnwindSafe for WeakRef<T>where T: RefUnwindSafe,

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impl<T> Unpin for WeakRef<T>

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impl<T> UnwindSafe for WeakRef<T>where T: RefUnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere 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<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.