Trait CountedSink 

pub trait CountedSink {
    type Error;

    // Required method
    fn write(&mut self, bytes: &[u8]) -> Result<usize, Self::Error>;
}

A sink whose successful writes report their exact accepted prefix.

write must return an accepted count no larger than bytes.len(). Err must mean that the failing call accepted zero bytes. This stronger contract lets Base64::encode_to_counted report exact committed progress; sinks that can mutate before returning Err must use formatter or I/O contracts with weaker prefix guarantees instead.

Required Associated Types

type Error

Sink-specific failure.

Required Methods

fn write(&mut self, bytes: &[u8]) -> Result<usize, Self::Error>

Accepts and reports the exact committed prefix of bytes.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors