Struct rs3cache_utils::lazy::Lazy
source · pub struct Lazy<A: Clone, T, E> { /* private fields */ }
Implementations§
Methods from Deref<Target = Result<T, E>>§
1.0.0 · sourcepub fn as_ref(&self) -> Result<&T, &E>
pub fn as_ref(&self) -> Result<&T, &E>
Converts from &Result<T, E>
to Result<&T, &E>
.
Produces a new Result
, containing a reference
into the original, leaving the original in place.
Examples
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.as_ref(), Ok(&2));
let x: Result<u32, &str> = Err("Error");
assert_eq!(x.as_ref(), Err(&"Error"));
1.47.0 · sourcepub fn as_deref(&self) -> Result<&<T as Deref>::Target, &E>where
T: Deref,
pub fn as_deref(&self) -> Result<&<T as Deref>::Target, &E>where T: Deref,
Converts from Result<T, E>
(or &Result<T, E>
) to Result<&<T as Deref>::Target, &E>
.
Coerces the Ok
variant of the original Result
via Deref
and returns the new Result
.
Examples
let x: Result<String, u32> = Ok("hello".to_string());
let y: Result<&str, &u32> = Ok("hello");
assert_eq!(x.as_deref(), y);
let x: Result<String, u32> = Err(42);
let y: Result<&str, &u32> = Err(&42);
assert_eq!(x.as_deref(), y);
1.0.0 · sourcepub fn iter(&self) -> Iter<'_, T>
pub fn iter(&self) -> Iter<'_, T>
Returns an iterator over the possibly contained value.
The iterator yields one value if the result is Result::Ok
, otherwise none.
Examples
let x: Result<u32, &str> = Ok(7);
assert_eq!(x.iter().next(), Some(&7));
let x: Result<u32, &str> = Err("nothing!");
assert_eq!(x.iter().next(), None);
sourcepub fn contains<U>(&self, x: &U) -> boolwhere
U: PartialEq<T>,
🔬This is a nightly-only experimental API. (option_result_contains
)
pub fn contains<U>(&self, x: &U) -> boolwhere U: PartialEq<T>,
option_result_contains
)Returns true
if the result is an Ok
value containing the given value.
Examples
#![feature(option_result_contains)]
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.contains(&2), true);
let x: Result<u32, &str> = Ok(3);
assert_eq!(x.contains(&2), false);
let x: Result<u32, &str> = Err("Some error message");
assert_eq!(x.contains(&2), false);
sourcepub fn contains_err<F>(&self, f: &F) -> boolwhere
F: PartialEq<E>,
🔬This is a nightly-only experimental API. (result_contains_err
)
pub fn contains_err<F>(&self, f: &F) -> boolwhere F: PartialEq<E>,
result_contains_err
)Returns true
if the result is an Err
value containing the given value.
Examples
#![feature(result_contains_err)]
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.contains_err(&"Some error message"), false);
let x: Result<u32, &str> = Err("Some error message");
assert_eq!(x.contains_err(&"Some error message"), true);
let x: Result<u32, &str> = Err("Some other error message");
assert_eq!(x.contains_err(&"Some error message"), false);