Enum Result 

pub enum Result<T, E> {
    Ok(T),
    Err(E),
}

Result is a type that represents either success (Ok) or failure (Err).

See the module documentation for details.

Variants

Ok(T)

Contains the success value

Err(E)

Contains the error value

Implementations

impl<T, E> Result<T, E>

pub const fn is_ok(&self) -> bool

Returns true if the result is Ok.

Examples

let x: Result<i32, &str> = Ok(-3);
assert_eq!(x.is_ok(), true);

let x: Result<i32, &str> = Err("Some error message");
assert_eq!(x.is_ok(), false);

pub fn is_ok_and<F>(self, f: F) -> bool

where F: FnOnce(T) -> bool, T:, E:,

Returns true if the result is Ok and the value inside of it matches a predicate.