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ResourceRef

vstd::resource::algebra

Struct ResourceRef 

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pub struct ResourceRef<'a, RA: ResourceAlgebra> { /* private fields */ }

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impl<'a, RA: ResourceAlgebra> ResourceRef<'a, RA>

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pub closed spec fn loc(self) -> Loc

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pub closed spec fn value(self) -> RA

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pub proof fn validate(tracked &self)

ensures
self.value().valid(),

Whenever we have a resource, that resource is valid. See Resource::validate for more details

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pub proof fn join_shared(tracked &self, tracked other: &Self) -> tracked out : Self

requires
self.loc() == other.loc(),
ensures
out.loc() == self.loc(),
incl(self.value(), out.value()) || self.value() == out.value(),
incl(other.value(), out.value()) || other.value() == out.value(),

This is useful when you have two (or more) shared resources and want to learn that they agree, as you can combine this validate, e.g., x.join_shared(y).validate().

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pub proof fn weaken(tracked &self, target: RA) -> tracked out : ResourceRef<'a, RA>

requires
incl(target, self.value()),
ensures
out.loc() == self.loc(),
out.value() == target,

Extract a shared reference to a preceding element in the extension order from a shared reference.

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pub proof fn duplicate_previous(tracked &self, value: RA) -> tracked out : Resource<RA>

requires
frame_preserving_update_opt(self.value(), RA::op(value, self.value())),
ensures
out.loc() == self.loc(),
out.value() == value,

If x --> x · y is a frame-perserving update, and we have a shared reference to x, we can create a resource to y

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pub proof fn join_shared_to_target(tracked &self, tracked other: &Self, target: RA) -> tracked out : Self

requires
self.loc() == other.loc(),
conjunct_shared(Some(self.value()), Some(other.value()), Some(target)),
ensures
out.loc() == self.loc(),
out.value() == target,

We can do a similar update to update_with_shared for non-deterministic updates

Auto Trait Implementations§

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impl<'a, RA> Freeze for ResourceRef<'a, RA>

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impl<'a, RA> RefUnwindSafe for ResourceRef<'a, RA>
where RA: RefUnwindSafe,

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impl<'a, RA> Send for ResourceRef<'a, RA>
where RA: Sync,

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impl<'a, RA> Sync for ResourceRef<'a, RA>
where RA: Sync,

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impl<'a, RA> Unpin for ResourceRef<'a, RA>

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impl<'a, RA> UnsafeUnpin for ResourceRef<'a, RA>

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impl<'a, RA> UnwindSafe for ResourceRef<'a, RA>
where RA: RefUnwindSafe,

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<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, VERUS_SPEC__A> FromSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: From<T>,

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exec fn obeys_from_spec() -> bool

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exec fn from_spec(v: T) -> VERUS_SPEC__A

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impl<T, U> Into<U> 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, VERUS_SPEC__A> IntoSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: Into<T>,

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exec fn obeys_into_spec() -> bool

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exec fn into_spec(self) -> T

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

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open spec fn obeys_into_spec() -> bool

{ <U as FromSpec<Self>>::obeys_from_spec() }
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open spec fn into_spec(self) -> U

{ U::from_spec(self) }
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, VERUS_SPEC__A> TryFromSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: TryFrom<T>,

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exec fn obeys_try_from_spec() -> bool

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exec fn try_from_spec( v: T, ) -> Result<VERUS_SPEC__A, <VERUS_SPEC__A as TryFrom<T>>::Error>

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

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T, VERUS_SPEC__A> TryIntoSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: TryInto<T>,

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exec fn obeys_try_into_spec() -> bool

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exec fn try_into_spec(self) -> Result<T, <VERUS_SPEC__A as TryInto<T>>::Error>

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

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open spec fn obeys_try_into_spec() -> bool

{ <U as TryFromSpec<Self>>::obeys_try_from_spec() }
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open spec fn try_into_spec(self) -> Result<U, <U as TryFrom<T>>::Error>

{ <U as TryFromSpec<Self>>::try_from_spec(self) }