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

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes

Size for each variant:

• Unknown: 0 bytes
• Size: 8 bytes