oxedyne/fe2o3 — fe2o3_syntax/src/opt.rs

1.4 KiB, 17 runs

created by r1870400018:1057, which is this file's identity for as long as the history lasts, whatever it is later renamed to

1	use oxedyne_fe2o3_core::prelude::*;
2
3	pub trait OptionRefVec<T> {
4	fn with_len<'a>(self, len: usize) -> Outcome<&'a [T]> where Self: 'a;
5	}
6
7	impl<'a, T> OptionRefVec<T> for Option<&'a Vec<T>> {
8	fn with_len<'b>(self, len: usize) -> Outcome<&'b [T]> where 'a: 'b {
9	self.map_or_else(
10	\|\| Err(err!("Expected {} values, found none.", len; Missing, Data)),
11	\|vals\| {
12	if vals.len() == len {
13	Ok(vals.as_slice())
14	} else {
15	Err(err!(
16	"Expected {} values, found {}.", len, vals.len();
17	Mismatch, Data, Size))
18	}
19	}
20	)
21	}
22	}
23
24	pub trait OptionMutVec<T> {
25	fn with_len<'a>(&'a mut self, len: usize) -> Outcome<&'a mut [T]> where Self: 'a;
26	}
27
28	impl<'a, T> OptionMutVec<T> for Option<&'a mut Vec<T>> {
29	fn with_len<'b>(&'b mut self, len: usize) -> Outcome<&'b mut [T]> where 'a: 'b {
30	self.as_deref_mut().map_or_else(
31	\|\| Err(err!("Expected {} values, found none.", len; Missing, Data)),
32	\|vals\| {
33	let vals = vals.as_mut_slice();
34	if vals.len() == len {
35	Ok(vals)
36	} else {
37	Err(err!(
38	"Expected {} values, found {}.", len, vals.len();
39	Mismatch, Data, Size))
40	}
41	}
42	)
43	}
44	}