[−][src]Trait io::PosRead

pub trait PosRead<T: Copy>: Read<T> {
    fn pread(&mut self, buf: &mut [T], pos: usize) -> Result<usize, Self::Err> { ... }
    fn preadv(
        &mut self, 
        bufs: &mut [&mut [T]], 
        pos: usize
    ) -> Result<usize, Self::Err> { ... }
    fn pread_full<E: From<Self::Err> + From<EndOfFile>>(
        &mut self, 
        buf: &mut [T], 
        pos: usize
    ) -> Result<(), (E, usize)> { ... }
}

Provided methods

`fn pread(&mut self, buf: &mut [T], pos: usize) -> Result<usize, Self::Err>`

r.pread(buf, pos) = r.preadv(&mut [buf], pos)

`fn preadv( &mut self, bufs: &mut [&mut [T]], pos: usize ) -> Result<usize, Self::Err>`

Pull some data, at most bufs.fold(0, |n, buf| n+buf.len()), from this source at given position into given buffers; return how many data were actually read, or a failure. May block if no data can be read when called.

If this returns 0 data read, the possibilities are these:

bufs.all(|buf| buf.len() == 0)
The reader reached some end, and can unlikely produce further bytes, at least temporarily.

`fn pread_full<E: From<Self::Err> + From<EndOfFile>>( &mut self, buf: &mut [T], pos: usize ) -> Result<(), (E, usize)>`

Pull buf.len() data from this source at given position into given buffer; return () if so many data were actually read, or a failure and how many data were read before the failure.

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Implementors