/*
 * Copyright (C) 2023 Fastly, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

pub struct Defer<T: FnOnce()> {
    f: Option<T>,
}

impl<T: FnOnce()> Defer<T> {
    pub fn new(f: T) -> Self {
        Self { f: Some(f) }
    }
}

impl<T: FnOnce()> Drop for Defer<T> {
    fn drop(&mut self) {
        let f = self.f.take().unwrap();

        f();
    }
}
