Macro bytecodec::bytecodec_try_encode

macro_rules! bytecodec_try_encode {
    ($encoder : expr, $offset : expr, $buf : expr, $eos : expr) => { ... };
    ($encoder : expr, $offset : expr, $buf : expr, $eos : expr, $($track_arg : tt)
 *) => { ... };
    ($encoder : expr, $offset : expr, $buf : expr, $eos : expr ;
 $($track_arg : tt) *) => { ... };
}

Tries to encode items to the given buffer.

Conceptually, this macro is expanded to the following expression.

if !$encoder.is_idle() {
    $offset += track!($encoder.encode(&mut $buf[$offset..], $eos))?;
    if !$encoder.is_idle() {
        return Ok($offset);
    }
}