Enum LengthResult 

pub enum LengthResult {
    Known(usize),
    Unknown,
}

Result of asking a list for its length.

Variants

Known(usize)

The list is finite and its length is known.

Unknown

The list is (or may be) endless; an exact length is not available.

Trait Implementations

impl Clone for LengthResult

fn clone(&self) -> LengthResult

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LengthResult

impl Debug for LengthResult

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

Formats the value using the given formatter.

impl Eq for LengthResult

impl PartialEq for LengthResult

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for LengthResult