graphrecords_query/error/
ordering.rs

1use crate::{Diagnostic, OwnedIndex};
2use std::{
3    error::Error,
4    fmt::{self, Debug, Display, Formatter},
5};
6
7#[derive(Debug)]
8pub struct IncomparableIndices<V, E: OwnedIndex> {
9    value: V,
10    first: E,
11    second: E,
12}
13
14impl<V, E: OwnedIndex> IncomparableIndices<V, E> {
15    #[must_use]
16    pub const fn new(value: V, first: E, second: E) -> Self {
17        Self {
18            value,
19            first,
20            second,
21        }
22    }
23
24    #[must_use]
25    pub const fn value(&self) -> &V {
26        &self.value
27    }
28
29    #[must_use]
30    pub const fn first(&self) -> &E {
31        &self.first
32    }
33
34    #[must_use]
35    pub const fn second(&self) -> &E {
36        &self.second
37    }
38}
39
40impl<V: Display, E: OwnedIndex> Display for IncomparableIndices<V, E> {
41    fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
42        write!(
43            formatter,
44            "cannot order elements sharing value `{}`: their indices `{}` and `{}` are not comparable",
45            self.value, self.first, self.second
46        )
47    }
48}
49
50impl<V: Debug + Display, E: OwnedIndex> Error for IncomparableIndices<V, E> {}
51
52impl<V: Debug + Display + Send + Sync + 'static, E: OwnedIndex> Diagnostic
53    for IncomparableIndices<V, E>
54{
55    fn name() -> &'static str {
56        "IncomparableIndices"
57    }
58
59    fn help(&self) -> Option<String> {
60        Some(
61            "to order them deterministically, sort by a key that distinguishes these elements"
62                .to_string(),
63        )
64    }
65}
graphrecords_query/error/ordering.rs

graphrecords_query/error/
ordering.rs
