risingwave_common/util/
functional.rs

1// Copyright 2025 RisingWave Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#[easy_ext::ext(SameOrElseExt)]
16pub impl<T: Eq> T {
17    /// Check if `self` and `other` are equal, if so, return `self`, otherwise return the result of `f()`.
18    fn same_or_else(self, other: T, f: impl FnOnce() -> T) -> T {
19        if self == other { self } else { f() }
20    }
21}

risingwave_common/util/functional.rs

risingwave_common/util/
functional.rs