Struct objc2::declare::IvarDrop

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pub struct IvarDrop<T> { /* private fields */ }

Expand description

A helper type to allow putting certain types that may drop into ivars.

This is used to work around current limitations in the type system. Consider this type “temporary” in the sense that one day it may just become type IvarDrop<T> = T.

This currently works with the following types:

Box<T>
Option<Box<T>>
Id<T, O>
Option<Id<T, O>>

Further may be added when the standard library guarantees their layout.

See examples/delegate.rs for usage.

Trait Implementations

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impl<T: Sized> InnerIvarType for IvarDrop<Box<T>>

type Output = Box<T, Global>

The type that an Ivar containing this will dereference to. Read more

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impl<T: Message, O: Ownership> InnerIvarType for IvarDrop<Id<T, O>>

type Output = Id<T, O>

The type that an Ivar containing this will dereference to. Read more

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impl<T: Sized> InnerIvarType for IvarDrop<Option<Box<T>>>

type Output = Option<Box<T, Global>>

The type that an Ivar containing this will dereference to. Read more

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impl<T: Message, O: Ownership> InnerIvarType for IvarDrop<Option<Id<T, O>>>

type Output = Option<Id<T, O>>

The type that an Ivar containing this will dereference to. Read more

Auto Trait Implementations

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

impl<T> Send for IvarDrop<T> where
T: Send,

impl<T> Sync for IvarDrop<T> where
T: Sync,

impl<T> Unpin for IvarDrop<T> where
T: Unpin,

impl<T> UnwindSafe for IvarDrop<T> where
T: UnwindSafe,

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> 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<T, U> TryFrom for T where
U: Into<T>,

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>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

Struct objc2::declare::IvarDrop

Trait Implementations

impl<T: Sized> InnerIvarType for IvarDrop<Box<T>>

type Output = Box<T, Global>

impl<T: Message, O: Ownership> InnerIvarType for IvarDrop<Id<T, O>>

type Output = Id<T, O>

impl<T: Sized> InnerIvarType for IvarDrop<Option<Box<T>>>

type Output = Option<Box<T, Global>>

impl<T: Message, O: Ownership> InnerIvarType for IvarDrop<Option<Id<T, O>>>

type Output = Option<Id<T, O>>

Auto Trait Implementations

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

impl<T> Send for IvarDrop<T> where
T: Send,

impl<T> Sync for IvarDrop<T> where
T: Sync,

impl<T> Unpin for IvarDrop<T> where
T: Unpin,

impl<T> UnwindSafe for IvarDrop<T> where
T: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

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

type Error = Infallible

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

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

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

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

Struct objc2::declare::IvarDrop

Trait Implementations

impl<T: Sized> InnerIvarType for IvarDrop<Box<T>>

type Output = Box<T, Global>

impl<T: Message, O: Ownership> InnerIvarType for IvarDrop<Id<T, O>>

type Output = Id<T, O>

impl<T: Sized> InnerIvarType for IvarDrop<Option<Box<T>>>

type Output = Option<Box<T, Global>>

impl<T: Message, O: Ownership> InnerIvarType for IvarDrop<Option<Id<T, O>>>

type Output = Option<Id<T, O>>

Auto Trait Implementations

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

impl<T> Send for IvarDrop<T> where T: Send,

impl<T> Sync for IvarDrop<T> where T: Sync,

impl<T> Unpin for IvarDrop<T> where T: Unpin,

impl<T> UnwindSafe for IvarDrop<T> where T: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

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

type Error = Infallible

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

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

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

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

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

impl<T> Send for IvarDrop<T> where
T: Send,

impl<T> Sync for IvarDrop<T> where
T: Sync,

impl<T> Unpin for IvarDrop<T> where
T: Unpin,

impl<T> UnwindSafe for IvarDrop<T> where
T: UnwindSafe,

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

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

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

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

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

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,