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utils.rs
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39 lines (37 loc) · 1.18 KB
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// -*- coding: utf-8 -*-
// ------------------------------------------------------------------------------------------------
// Copyright © 2021, stack-graphs authors.
// Licensed under either of Apache License, Version 2.0, or MIT license, at your option.
// Please see the LICENSE-APACHE or LICENSE-MIT files in this distribution for license details.
// ------------------------------------------------------------------------------------------------
pub(crate) fn equals_option<A, B, F>(a: Option<A>, b: Option<B>, mut eq: F) -> bool
where
F: FnMut(A, B) -> bool,
{
match a {
Some(a) => match b {
Some(b) => eq(a, b),
None => false,
},
None => match b {
Some(_) => false,
None => true,
},
}
}
pub(crate) fn cmp_option<T, F>(a: Option<T>, b: Option<T>, mut cmp: F) -> std::cmp::Ordering
where
F: FnMut(T, T) -> std::cmp::Ordering,
{
use std::cmp::Ordering;
match a {
Some(a) => match b {
Some(b) => cmp(a, b),
None => Ordering::Greater,
},
None => match b {
Some(_) => Ordering::Less,
None => Ordering::Equal,
},
}
}