Enum Needed

pub enum Needed {
    Unknown,
    Size(NonZeroUsize),
}

Contains information on needed data if a parser returned Incomplete

Note: This is only possible for Stream that are partial, like Partial.

Variants

Unknown

Needs more data, but we do not know how much

Size(NonZeroUsize)

Contains a lower bound on the buffer offset needed to finish parsing

For byte/&str streams, this translates to bytes

Implementations

impl Needed

pub fn new(s: usize) -> Self

Creates Needed instance, returns Needed::Unknown if the argument is zero

pub fn is_known(&self) -> bool

Indicates if we know how many bytes we need

pub fn map<F: Fn(NonZeroUsize) -> usize>(self, f: F) -> Needed

Maps a Needed to Needed by applying a function to a contained Size value.

Trait Implementations

impl Clone for Needed

fn clone(&self) -> Needed

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Needed

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

Formats the value using the given formatter.

impl PartialEq for Needed

fn eq(&self, other: &Needed) -> 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 Copy for Needed

impl Eq for Needed

impl StructuralPartialEq for Needed