Struct HexWriter

pub struct HexWriter(/* private fields */);

A struct implementing io::Write that converts what’s written to it into a hex String.

If you already have the data to be converted in a Vec<u8> use ToHex but if you have an encodable object, by using this you avoid the serialization to Vec<u8> by going directly to String.

Note that to achieve better perfomance than ToHex the struct must be created with the right capacity of the final hex string so that the inner String doesn’t re-allocate.

Implementations

impl HexWriter

pub fn new(capacity: usize) -> HexWriter

Creates a new HexWriter with the capacity of the inner String that will contain final hex value.

pub fn result(self) -> String

Returns the resulting hex string.

Trait Implementations

impl Write for HexWriter

fn write(&mut self, buf: &[u8]) -> Result<usize, Error>

Writes a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<(), Error>

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.