Struct CappedWriter 

pub struct CappedWriter {
    path: PathBuf,
    cap: u64,
    file: Option<File>,
    size: u64,
}

An append-only file that moves itself to <name>.1 (replacing any earlier one) before a write that would take it past the cap. Whole writes stay whole; there is never a .2.

Fields

path: PathBuf

cap: u64

file: Option<File>

size: u64

Implementations

impl CappedWriter

pub fn open(path: &Path, cap: u64) -> Result<Self>

fn roll(&mut self) -> Result<()>

Trait Implementations

impl Write for CappedWriter

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

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

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

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, args: 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.