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use serde::Deserialize;
use std::ops::Range;
/// Describes the values to test for a const generic parameter.
#[derive(Debug, PartialEq, Clone, Deserialize)]
pub enum Constraint {
/// Test a single value.
Equal(i64),
/// Test a range of values, e.g. `0..16`.
Range(Range<i64>),
/// Test discrete values, e.g. `vec![1, 2, 4, 8]`.
Set(Vec<i64>),
}
impl Constraint {
/// Iterate over the values of this constraint.
pub fn iter<'a>(&'a self) -> impl Iterator<Item = i64> + 'a {
match self {
Constraint::Equal(i) => std::slice::Iter::default().copied().chain(*i..*i + 1),
Constraint::Range(range) => std::slice::Iter::default().copied().chain(range.clone()),
Constraint::Set(items) => items.iter().copied().chain(std::ops::Range::default()),
}
}
}
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