Struct Frac Copy item path

pub open spec fn valid(self, id: Loc, frac: int) -> bool

{
    &&& self.id() == id
    &&& self.frac() == frac

}

pub proof fn new(tracked v: T) -> tracked result : Self

requires

TOTAL > 0,

ensures

result.frac() == TOTAL as int,

result.resource() == v,

Create a fractional token that maintains shared access to the input resource.

pub proof fn agree(tracked &self, tracked other: &Self)

requires

self.id() == other.id(),

ensures

self.resource() == other.resource(),

Two tokens agree on values of the underlying resource.

pub proof fn split(tracked &mut self, n: int) -> tracked result : Self

requires

0 < n < old(self).frac(),

ensures

result.id() == self.id() == old(self).id(),

self.resource() == old(self).resource(),

result.resource() == old(self).resource(),

self.frac() + result.frac() == old(self).frac(),

result.frac() == n,

Split one token into two tokens whose quantities sum to the original. The returned token has quantity n; the new value of the input token has quantity old(self).frac() - n.

pub proof fn combine(tracked &mut self, tracked other: Self)

requires

old(self).id() == other.id(),

ensures

self.id() == old(self).id(),

self.resource() == old(self).resource(),

self.resource() == other.resource(),

self.frac() == old(self).frac() + other.frac(),

Combine two tokens, summing their quantities.

pub proof fn bounded(tracked &self)

ensures

0 < self.frac() <= TOTAL,

Allowed values for a token’s quantity.

pub proof fn borrow(tracked &self) -> tracked ret : &T

ensures

ret == self.resource(),

Obtain shared access to the underlying resource.

pub proof fn take_resource(tracked self) -> tracked pair : (T, Empty<T, TOTAL>)

requires

self.frac() == TOTAL,

ensures

pair.0 == self.resource(),

pair.1.id() == self.id(),

Reclaim full ownership of the underlying resource.

Auto Trait Implementations§

impl<T, const TOTAL: u64> Freeze for Frac<T, TOTAL>

impl<T, const TOTAL: u64> RefUnwindSafe for Frac<T, TOTAL>
where T: RefUnwindSafe,

impl<T, const TOTAL: u64> Send for Frac<T, TOTAL>
where T: Send + Sync,

impl<T, const TOTAL: u64> Sync for Frac<T, TOTAL>
where T: Sync + Send,

impl<T, const TOTAL: u64> Unpin for Frac<T, TOTAL>
where T: Unpin,

impl<T, const TOTAL: u64> UnwindSafe for Frac<T, TOTAL>
where T: UnwindSafe,

Blanket Implementations§

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

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

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

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

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

fn into(self) -> U

Calls U::from(self).

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

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

type Error = Infallible

The type returned in the event of a conversion error.

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

Performs the conversion.

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

type Error = >::Error

The type returned in the event of a conversion error.