[−][src]Trait stdext::option::OptionExt
Extension trait with useful methods for std::option::Option
.
Required methods
fn combine<U>(self, other: Option<U>) -> Option<(T, U)>
Combines self
and another Option
.
If self
is Some(s)
and other
is Some(o)
, this method returns Some((s, o))
.
Otherwise, None
is returned.
Note: std::Option
already provides a zip
method which serves exact same purpose,
but currently it's unstable. Once it's stabilized, this method will be marked as deprecated
with a prompt to use the stanard method instead.
Examples
use stdext::prelude::*; let x = Some(1); let y = Some("hi"); let z = None::<u8>; assert_eq!(x.combine(y), Some((1, "hi"))); assert_eq!(x.combine(z), None);
fn combine_with<U, F, R>(self, other: Option<U>, f: F) -> Option<R> where
F: FnOnce(T, U) -> R,
F: FnOnce(T, U) -> R,
Combines self
and another Option
with function f
.
If self
is Some(s)
and other
is Some(o)
, this method returns Some(f(s, o))
.
Otherwise, None
is returned.
Note: std::Option
already provides a zip_with
method which serves exact same purpose,
but currently it's unstable. Once it's stabilized, this method will be marked as deprecated
with a prompt to use the stanard method instead.
Examples
use stdext::prelude::*; #[derive(Debug, PartialEq)] struct Point { x: f64, y: f64, } impl Point { fn new(x: f64, y: f64) -> Self { Self { x, y } } } let x = Some(17.5); let y = Some(42.7); assert_eq!(x.combine_with(y, Point::new), Some(Point { x: 17.5, y: 42.7 })); assert_eq!(x.combine_with(None, Point::new), None);
Implementations on Foreign Types
impl<T> OptionExt<T> for Option<T>
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fn combine<U>(self, other: Option<U>) -> Option<(T, U)>
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fn combine_with<U, F, R>(self, other: Option<U>, f: F) -> Option<R> where
F: FnOnce(T, U) -> R,
[src]
F: FnOnce(T, U) -> R,