Struct buf_file::BufFile
[−]
[src]
pub struct BufFile<F: Write + Read + Seek> { /* fields omitted */ }
Methods
impl<F: Write + Read + Seek> BufFile<F>
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fn new(file: F) -> Result<BufFile<F>, Error>
Creates a new BufFile.
fn with_capacity(slabs: usize, file: F) -> Result<BufFile<F>, Error>
Creates a new BufFile with the specified number of slabs.
fn into_inner(self) -> Result<F, Error>
Returns the underlying Read + Write + Sync struct after writing to disk.
fn set_slabs(&mut self, num_slabs: usize) -> Result<(), Error>
Change the number of slabs to the desired number. If there are more slabs
currently loaded than num_slabs
, then the least frequently used slab(s)
will be removed until it is equal. Every removed slab gets written to disk,
creating the possibility for I/O errors.
fn cursor_loc(&self) -> u64
Returns the current cursor_loc
Trait Implementations
impl<F: Write + Read + Seek> Read for BufFile<F>
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fn read(&mut self, buf: &mut [u8]) -> Result<usize, Error>
Pull some bytes from this source into the specified buffer, returning how many bytes were read. Read more
unsafe fn initializer(&self) -> Initializer
read_initializer
)Determines if this Read
er can work with buffers of uninitialized memory. Read more
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>
1.0.0
Read all bytes until EOF in this source, placing them into buf
. Read more
fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>
1.0.0
Read all bytes until EOF in this source, placing them into buf
. Read more
fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>
1.6.0
Read the exact number of bytes required to fill buf
. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0
Creates a "by reference" adaptor for this instance of Read
. Read more
fn bytes(self) -> Bytes<Self>
1.0.0
Transforms this Read
instance to an Iterator
over its bytes. Read more
fn chars(self) -> Chars<Self>
🔬 This is a nightly-only experimental API. (io
)
the semantics of a partial read/write of where errors happen is currently unclear and may change
Transforms this Read
instance to an Iterator
over char
s. Read more
fn chain<R>(self, next: R) -> Chain<Self, R> where
R: Read,
1.0.0
R: Read,
Creates an adaptor which will chain this stream with another. Read more
fn take(self, limit: u64) -> Take<Self>
1.0.0
Creates an adaptor which will read at most limit
bytes from it. Read more
impl<F: Write + Read + Seek> Write for BufFile<F>
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fn write(&mut self, buf: &[u8]) -> Result<usize, Error>
Write a buffer into this object, returning how many bytes were written. Read more
fn flush(&mut self) -> Result<(), Error>
Flush this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
1.0.0
Attempts to write an entire buffer into this write. Read more
fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>
1.0.0
Writes a formatted string into this writer, returning any error encountered. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0
Creates a "by reference" adaptor for this instance of Write
. Read more
impl<F: Write + Read + Seek> Seek for BufFile<F>
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fn seek(&mut self, pos: SeekFrom) -> Result<u64, Error>
Seek to an offset, in bytes, in a stream. Read more
impl<F: Read + Write + Seek> Drop for BufFile<F>
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fn drop(&mut self)
Write all of the slabs to disk before closing the file.