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//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//

pub trait GetErr<T> {
    fn get_err(self) -> Option<T>;
}

impl<U, T> GetErr<T> for Result<U, T> {
    fn get_err(self) -> Option<T> {
        self.err()
    }
}

pub trait GetOk<T> {
    fn get_ok(self) -> Option<T>;
}

impl<T, E> GetOk<T> for Result<T, E> {
    fn get_ok(self) -> Option<T> {
        self.ok()
    }
}


/// Extend any Iterator with a `process` method, equivalent to a fallible for_each.
pub trait Process<T> {
    fn process<R: Default, E, F>(self, f: F) -> Result<R, E>
        where F: Fn(T) -> Result<R, E>;
}

impl<I: Iterator> Process<I::Item> for I {
    /// Process all errors with a lambda
    fn process<R: Default, E, F>(self, f: F) -> Result<R, E>
        where F: Fn(I::Item) -> Result<R, E>
    {
        for element in self {
            let _ = f(element)?;
        }
        Ok(R::default())
    }
}