Struct Optional

pub struct Optional;

Namespace for functions that perform encoding of Option values.

Implementations

impl Optional

pub fn read<R: Read, T, F>(reader: R, func: F) -> Result<Option<T>>

where F: Fn(R) -> Result<T>,

Reads an optional value, assuming the encoding written by Optional::write, using the provided function to decode the contained element if present.

pub fn write<W: Write, T, F>(writer: W, val: Option<T>, func: F) -> Result<()>

where F: Fn(W, T) -> Result<()>,

Writes an optional value to a stream by writing a flag byte with a value of 0 if no value is present, or 1 if there is a value, followed by the encoding of the contents of the option as performed by the provided function.