byte_parser/
position.rs

1
2use std::ops::{ Deref, Add };
3
4
5#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
6pub struct Position(Option<usize>);
7
8impl Position {
9	pub fn null() -> Self {
10		Self( None )
11	}
12
13	pub fn opt(&self) -> Option<usize> {
14		self.0
15	}
16}
17
18impl Deref for Position {
19	type Target = Option<usize>;
20	fn deref(&self) -> &Self::Target {
21		&self.0
22	}
23}
24
25impl Add<usize> for Position {
26	type Output = usize;
27
28	/// panics if you want to add zero on null
29	fn add(self, other: usize) -> usize {
30		match self.0 {
31			Some(o) => o + other,
32			None => other - 1
33		}
34	}
35}
36
37impl From<usize> for Position {
38	fn from(n: usize) -> Self {
39		Self(Some(n))
40	}
41}
byte_parser/position.rs

byte_parser/
position.rs
