Enum Demand 

pub enum Demand {
    Bytes(usize),
    Stop,
}

Available on crate feature alloc only.

Describes what the I/O layer should do next.

Variants

Bytes(usize)

Read len bytes and pass them to JournalReader::feed.

len never exceeds the reader’s configured maximum frame length (see JournalReader::with_max_frame_len); a header declaring a larger frame is reported as Step::Corrupt instead of demanded.

If the source returns fewer bytes than requested:

• When JournalReader::is_frame_boundary is true and zero bytes are read, the stream ended cleanly.
• Otherwise, the tail is truncated/corrupt; truncate the source to JournalReader::bytes_consumed.

Stop

The reader is finished and will not accept any more bytes (it previously detected corruption). Truncate the source to JournalReader::bytes_consumed.

Trait Implementations

impl Clone for Demand

fn clone(&self) -> Demand

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Demand

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

Formats the value using the given formatter.

impl PartialEq for Demand

fn eq(&self, other: &Demand) -> 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 Demand

impl Eq for Demand

impl StructuralPartialEq for Demand