Macro bytecodec::bytecodec_try_decode

macro_rules! bytecodec_try_decode {
    ($decoder:expr, $offset:expr, $buf:expr, $eos:expr) => { ... };
}

Tries to decode an item from the given buffer.

Note that this macro assumes $decoder is an instance of Buffered<_>.

This macro is expanded to the following expression.

if !$decoder.has_item() {
    $offset += track!($decoder.decode(&$buf[$offset..], $eos))?.0;
    if let Some(item) = $decoder.get_item() {
        Some(item)
    } else {
        return Ok(($offset, None));
    }
} else {
    None
}