rs_matter/utils/
iter.rs

1/*
2 *
3 *    Copyright (c) 2024 Project CHIP Authors
4 *
5 *    Licensed under the Apache License, Version 2.0 (the "License");
6 *    you may not use this file except in compliance with the License.
7 *    You may obtain a copy of the License at
8 *
9 *        http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *    Unless required by applicable law or agreed to in writing, software
12 *    distributed under the License is distributed on an "AS IS" BASIS,
13 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *    See the License for the specific language governing permissions and
15 *    limitations under the License.
16 */
17
18/// An extension trait for `Iterator` implementing several utility methods.
19pub trait TryFindIterator<T, E>: Iterator<Item = Result<T, E>> + Sized {
20    /// Find the first element that satisfies the supplied `predicate`.
21    ///
22    /// Method name is `do_try_find` to avoid collissions with `Iterator::try_find`
23    /// once it gets stabilized.
24    fn do_try_find<P>(self, mut predicate: P) -> Result<Option<T>, E>
25    where
26        P: FnMut(&T) -> Result<bool, E>,
27    {
28        for val in self {
29            let val = val?;
30
31            let result = predicate(&val);
32            match result {
33                Ok(matches) => {
34                    if matches {
35                        return Ok(Some(val));
36                    }
37                }
38                Err(err) => {
39                    return Err(err);
40                }
41            }
42        }
43
44        Ok(None)
45    }
46}
47
48impl<T, I, E> TryFindIterator<T, E> for I where I: Iterator<Item = Result<T, E>> {}
rs_matter/utils/iter.rs

rs_matter/utils/
iter.rs
