Struct FixedBuffer 

pub struct FixedBuffer<const N: usize> { /* private fields */ }

Fixed-size, owned buffer implementing core::fmt::Write.

• Completely no_std and allocation-free.
• Capacity is a const generic N.
• On overflow, write_str returns Err(fmt::Error) (no partial writes).

Implementations

impl<const N: usize> FixedBuffer<N>

pub const fn new() -> Self

Create a new empty buffer.

pub const fn capacity(&self) -> usize

Maximum capacity in bytes.

pub fn len(&self) -> &usize

Number of bytes currently written.

pub const fn is_empty(&self) -> bool

Returns true if the buffer is empty.

pub fn as_bytes(&self) -> &[u8]

Access the written portion as bytes.

pub fn as_str(&self) -> &str

Access the written portion as &str.

Panics if the contents are not valid UTF-8, which is fine for telemetry because we only ever write ASCII.

pub fn clear(&mut self)

Clear the buffer without reallocating.

Trait Implementations

impl<const N: usize> Clone for FixedBuffer<N>

fn clone(&self) -> FixedBuffer<N>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<const N: usize> Default for FixedBuffer<N>

fn default() -> Self

Returns the “default value” for a type.

impl<const N: usize> Write for FixedBuffer<N>

fn write_str(&mut self, s: &str) -> Result

Writes a string slice into this writer, returning whether the write succeeded.

fn write_char(&mut self, c: char) -> Result<(), Error>

Writes a char into this writer, returning whether the write succeeded.

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

Glue for usage of the write! macro with implementors of this trait.

impl<const N: usize> Copy for FixedBuffer<N>