Struct FilterCtx 

pub struct FilterCtx<'a> { /* private fields */ }

Context used while traversing a complete filter chain.

A context tracks the current layer and the write activity accumulated while traversing it. with_next advances to the inner layer, while with_buffer exposes the buffers adjacent to the current layer.

Implementations

impl FilterCtx<'_>

pub fn io(&self) -> &IoRef

Gets a reference to the I/O object.

pub fn tag(&self) -> &'static str

Gets the I/O tag.

pub fn with_next<F, R>(&mut self, f: F) -> R

where F: FnOnce(&mut Self) -> R,

Invokes f with the context advanced to the next inner filter.

The previous layer is restored after f returns.

pub fn with_buffer<F, R>(&mut self, f: F) -> R

where F: FnOnce(&mut FilterBuf<'_>) -> R,

Invokes f with the buffers adjacent to the current filter.

pub fn read_dst_size(&self) -> usize

Returns the size of the application-facing read buffer.

pub fn write_dst_size(&mut self) -> usize

Returns the size of the transport-facing write buffer.

Trait Implementations

impl<'a> Debug for FilterCtx<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.