Trait Progress 

pub trait Progress {
    // Provided methods
    fn format(&mut self, _format: Option<InputFormat>) { ... }
    fn input_read(&mut self, _done: u64, _total: u64) { ... }
    fn is_cancelled(&self) -> bool { ... }
}

What a facade operation tells its caller while it runs, and how the caller stops it. Every method has a default; NeverCancel uses them all.

Provided Methods

fn format(&mut self, _format: Option<InputFormat>)

The input family, given in the options or detected from the leading signature; None when the input is empty or unrecognized. Called once, before the operation refuses the family or reads past the signature.

fn input_read(&mut self, _done: u64, _total: u64)

The furthest document byte read so far advanced to done of the document’s total bytes. Format engines read their indexes first and then page payloads in order, so this advances with the operation.

fn is_cancelled(&self) -> bool

Whether the caller asked to stop; checked between rows, pages and I/O chunks. A cancelled operation fails with ErrorKind::Cancelled and does not undo bytes already written.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl Progress for NeverCancel

Reports nothing and never cancels.