djin-protocol 3.3.0

A for of protocol, for aoe-djin
Documentation 
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use crate::{hint, Parcel, Error, Settings};

use std::io::prelude::*;

impl<T: Parcel> Parcel for Option<T>
{
    const TYPE_NAME: &'static str = "Option<T>";

    fn read_field(read: &mut dyn Read,
                  settings: &Settings,
                  hints: &mut hint::Hints) -> Result<Self, Error> {
        if let Some(skip) = hints.skip_hint {
            if skip {
                Ok(None)
            } else {
                Ok(Some(T::read_field(read, settings, hints)?))
            }
        } else {
            let is_some = bool::read(read, settings)?;

            if is_some {
                let value = T::read(read, settings)?;
                Ok(Some(value))
            } else {
                Ok(None)
            }
        }
    }

    fn write_field(&self, write: &mut dyn Write,
                   settings: &Settings,
                   _: &mut hint::Hints) -> Result<(), Error> {
        self.is_some().write(write, settings)?;

        if let Some(ref value) = *self {
            value.write(write, settings)?;
        }

        Ok(())
    }
}