1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
use super::{NumBytes, Read, ReadError, Write, WriteError}; impl<T> NumBytes for Option<T> where T: NumBytes, { #[inline] fn num_bytes(&self) -> usize { let mut count = self.is_some().num_bytes(); if let Some(t) = self { count += t.num_bytes(); } count } } impl<T> Read for Option<T> where T: Read, { #[inline] fn read(bytes: &[u8], pos: &mut usize) -> Result<Self, ReadError> { let is_some = bool::read(bytes, pos)?; if is_some { Ok(Some(T::read(bytes, pos)?)) } else { Ok(None) } } } impl<T> Write for Option<T> where T: Write + Default, { #[inline] fn write( &self, bytes: &mut [u8], pos: &mut usize, ) -> Result<(), WriteError> { self.is_some().write(bytes, pos)?; match self { Some(item) => item.write(bytes, pos), None => Ok(()), } } }