Trait try_map::FallibleMapExt

pub trait FallibleMapExt<T, U, E> {
    fn try_map<F>(self, f: F) -> Result<Option<U>, E>
    where
        F: FnOnce(T) -> Result<U, E>;
}

Extend Option with a fallible map method

This is useful for mapping fallible operations (i.e. operations that) return Result, over an optional type. The result will be Result<Option<U>>, which makes it easy to handle the errors that originate from inside the closure that's being mapped.

Type parameters

• T: The input Option's value type
• U: The outputs Option's value type
• E: The possible error during the mapping

Required Methods

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

Try to apply a fallible map function to the option

Implementations on Foreign Types

impl<T, U, E> FallibleMapExt<T, U, E> for Option<T>

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

Implementors