Trait gazebo::prelude::OptionExt

pub trait OptionExt {
    type Item;

    fn into_try_map<U, E, F: FnOnce(Self::Item) -> Result<U, E>>(
        self,
        f: F
    ) -> Result<Option<U>, E>;
    fn try_map<U, E, F: FnOnce(&Self::Item) -> Result<U, E>>(
        self,
        f: F
    ) -> Result<Option<U>, E>;
}

Extension traits on Option where it holds any value or ref.

Required Associated Types

type Item

Required Methods

fn into_try_map<U, E, F: FnOnce(Self::Item) -> Result<U, E>>(
    self,
    f: F
) -> Result<Option<U>, E>

Like map, but as a Result

use gazebo::prelude::*;

assert_eq!(Some("foo").into_try_map(|x| Ok::<_, ()>(x.len())), Ok(Some(3)));
assert_eq!(Some("foo").into_try_map(|x| Err::<(), _>(())), Err(()));

fn try_map<U, E, F: FnOnce(&Self::Item) -> Result<U, E>>(
    self,
    f: F
) -> Result<Option<U>, E>

Like map, but as a Result

use gazebo::prelude::*;

assert_eq!(Some("foo").try_map(|x| Ok::<_, ()>(x.len())), Ok(Some(3)));
assert_eq!(Some("foo").try_map(|x| Err::<(), _>(())), Err(()));

Implementations on Foreign Types

impl<T> OptionExt for Option<T>

type Item = T

fn into_try_map<U, E, F: FnOnce(Self::Item) -> Result<U, E>>(
    self,
    f: F
) -> Result<Option<U>, E>

fn try_map<U, E, F: FnOnce(&Self::Item) -> Result<U, E>>(
    self,
    f: F
) -> Result<Option<U>, E>

Implementors