[][src]Struct positioned_io_preview::Slice

pub struct Slice<I> { /* fields omitted */ }

A window into another ReadAt or WriteAt.

Given an existing positioned I/O, this presents a limited view of it.

Examples

Some slices have size restrictions:

use positioned_io::{ReadAt, Slice};

let a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
let slice = Slice::new(&a[..], 4, Some(4));

let mut buf = [0; 4];
let bytes = slice.read_at(2, &mut buf)?;
assert_eq!(bytes, 2);
assert_eq!(buf, [6, 7, 0, 0]);

Some slices do not:

use positioned_io::{WriteAt, Slice};

let mut v = vec![0, 1, 2, 3, 4, 5];
let buf = [9; 3];

{
    let mut slice = Slice::new(&mut v, 2, None);
    slice.write_all_at(3, &buf)?;
}

// The write goes right past the end.
assert_eq!(v, vec![0, 1, 2, 3, 4, 9, 9, 9]);

Methods

impl<I> Slice<I>
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Create a new Slice.

The slice will be a view of size bytes, starting at offset in io. If you do not pass a size, the size won't be limited.

impl<I: Size> Slice<I>
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Create a new Slice that goes to the end of io.

Note that you can create a larger slice by passing a larger size to new(), but it won't do you any good for reading.

Trait Implementations

impl<I: ReadAt> ReadAt for Slice<I>
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Reads the exact number of bytes required to fill buf from an offset. Read more

impl<I: WriteAt> WriteAt for Slice<I>
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Writes a complete buffer at an offset. Read more

impl<I> Size for Slice<I>
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impl<I: Clone> Clone for Slice<I>
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Performs copy-assignment from source. Read more

impl<I: Debug> Debug for Slice<I>
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Auto Trait Implementations

impl<I> Send for Slice<I> where
    I: Send

impl<I> Sync for Slice<I> where
    I: Sync

Blanket Implementations

impl<T> From for T
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impl<T, U> Into for T where
    U: From<T>, 
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impl<T> ToOwned for T where
    T: Clone
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impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
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impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> BorrowMut for T where
    T: ?Sized
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impl<T> Any for T where
    T: 'static + ?Sized
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