Trait SourceSize 

pub unsafe trait SourceSize {
    // Provided methods
    fn lower_bound(&self) -> u64 { ... }
    fn upper_bound(&self) -> Option<u64> { ... }
}

A trait which gives known upper and lower bounds of the size of the source.

Safety

Other functions rely on these bounds being correct. The source must produce at least the number of bytes returned by lower_bound, and at most that returned by upper_bound.

Provided Methods

fn lower_bound(&self) -> u64

fn upper_bound(&self) -> Option<u64>

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl SourceSize for &Empty

fn upper_bound(&self) -> Option<u64>

impl SourceSize for &File

Available on Unix or WASI or Windows only.

fn upper_bound(&self) -> Option<u64>

impl SourceSize for &[u8]

fn lower_bound(&self) -> u64

fn upper_bound(&self) -> Option<u64>

impl SourceSize for Empty

fn upper_bound(&self) -> Option<u64>

impl SourceSize for File

Available on Unix or WASI or Windows only.

fn upper_bound(&self) -> Option<u64>

impl SourceSize for Vec<u8>

Available on crate feature alloc only.

fn lower_bound(&self) -> u64

fn upper_bound(&self) -> Option<u64>

impl SourceSize for VecDeque<u8>

fn lower_bound(&self) -> u64

fn upper_bound(&self) -> Option<u64>

impl<R: Read + SourceSize + ?Sized> SourceSize for BufReader<R>

fn lower_bound(&self) -> u64

fn upper_bound(&self) -> Option<u64>

impl<T: AsRef<[u8]>> SourceSize for Cursor<T>

fn lower_bound(&self) -> u64

fn upper_bound(&self) -> Option<u64>

impl<T> SourceSize for Take<T>

fn upper_bound(&self) -> Option<u64>

Implementors

impl<T: InfiniteSource> SourceSize for T