Trait OptionExt 

pub trait OptionExt<T> {
    // Required methods
    fn ok_or_error<E>(self, error: E) -> Result<T>
       where E: Into<Error>;
    fn and_then_some<F, U>(self, f: F) -> Option<U>
       where F: FnOnce(T) -> Option<U>;
    fn or_else_some<F>(self, f: F) -> Option<T>
       where F: FnOnce() -> Option<T>;
    fn filter_some<F>(self, predicate: F) -> Option<T>
       where F: FnOnce(&T) -> bool;
}

Extension trait for Option monadic operations

Required Methods

fn ok_or_error<E>(self, error: E) -> Result<T>

where E: Into<Error>,

Convert None to an error

fn and_then_some<F, U>(self, f: F) -> Option<U>

where F: FnOnce(T) -> Option<U>,

Chain operations on Some

fn or_else_some<F>(self, f: F) -> Option<T>

where F: FnOnce() -> Option<T>,

Provide alternative on None

fn filter_some<F>(self, predicate: F) -> Option<T>

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

Filter with predicate

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<T> OptionExt<T> for Option<T>

fn ok_or_error<E>(self, error: E) -> Result<T>

where E: Into<Error>,

fn and_then_some<F, U>(self, f: F) -> Option<U>

where F: FnOnce(T) -> Option<U>,

fn or_else_some<F>(self, f: F) -> Option<T>

where F: FnOnce() -> Option<T>,

fn filter_some<F>(self, predicate: F) -> Option<T>

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

Implementors