Struct Bound 

pub struct Bound { /* private fields */ }

How many times a loop runs at most, and what that rests on.

For correctness. A pass that deletes an iteration, peels one off, or decides a memory access is in bounds needs one of these. The count cannot be read without the assumptions, which is section 7.7’s defence against a caller proving two of three and forgetting the third.

Implementations

impl Bound

pub fn parts(&self) -> (Count, &[Assumption])

The count and everything it rests on, together, because they cannot be asked for apart.

pub fn assumptions(&self) -> &[Assumption]

What has to be proved before the count means anything.

pub fn proven(&self) -> Option<Count>

The count, for a caller with nothing left to prove.

None does not mean the count is unknown. It means there are assumptions and this is not the accessor for reading a count that has them.

Trait Implementations

impl Clone for Bound

fn clone(&self) -> Bound

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Bound

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

Formats the value using the given formatter.

impl Eq for Bound

impl PartialEq for Bound

fn eq(&self, other: &Bound) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Bound