OptionExt

debtmap::core::monadic

Trait OptionExt 

Source 
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;
}
Expand description

Extension trait for Option monadic operations

Required Methods§

Source

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

Convert None to an error

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

Chain operations on Some

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

Provide alternative on None

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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", so this trait is not object safe.

Implementations on Foreign Types§

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

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

Source§

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

Source§

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

Source§

fn filter_some<F>(self, predicate: F) -> Option<T>
where F: FnOnce(&T) -> bool,

Implementors§