Struct Erased

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pub struct Erased { /* private fields */ }

Expand description

A type-erased value

This is vaguely a wrapper over Box<dyn (Any + Debug)>, except that Rust doesn’t (yet) support multi-trait objects.

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impl Erased

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pub fn new<V>(v: V) -> Erased
where V: Any + Debug,

Construct

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pub fn is<T>(&self) -> bool
where T: 'static,

Returns true if the inner type is the same as T.

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pub fn downcast<T>(self) -> Result<Box<T>, Box<dyn Any>>
where T: 'static,

Attempt to downcast self to a concrete type.

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pub fn downcast_ref<T>(&self) -> Option<&T>
where T: 'static,

Returns some reference to the inner value if it is of type T, or None if it isn’t.

Trait Implementations§

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impl Debug for Erased

Support debug formatting

Debug builds only. On release builds, a placeholder message is printed.

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl !UnwindSafe for Erased

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,

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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,

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

Mutably borrows from an owned value. Read more

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impl<S, T> Cast<T> for S
where T: Conv<S>,

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fn cast(self) -> T

Cast from Self to T Read more

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fn try_cast(self) -> Result<T, Error>

Try converting from Self to T Read more

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impl<S, T> CastApprox<T> for S
where T: ConvApprox<S>,

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fn try_cast_approx(self) -> Result<T, Error>

Try approximate conversion from Self to T Read more

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fn cast_approx(self) -> T

Cast approximately from Self to T Read more

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impl<S, T> CastFloat<T> for S
where T: ConvFloat<S>,

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fn cast_trunc(self) -> T

Cast to integer, truncating Read more

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fn cast_nearest(self) -> T

Cast to the nearest integer Read more

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fn cast_floor(self) -> T

Cast the floor to an integer Read more

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fn cast_ceil(self) -> T

Cast the ceiling to an integer Read more

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fn try_cast_trunc(self) -> Result<T, Error>

Try converting to integer with truncation Read more

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fn try_cast_nearest(self) -> Result<T, Error>

Try converting to the nearest integer Read more

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fn try_cast_floor(self) -> Result<T, Error>

Try converting the floor to an integer Read more

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fn try_cast_ceil(self) -> Result<T, Error>

Try convert the ceiling to an integer Read more

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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.

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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.

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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.

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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.

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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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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

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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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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