Trait FallibleMapExt

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

From https://github.com/rust-lang/rust/issues/38282#issuecomment-266275785

Extend Option with a fallible map method.

(Note that the usual collect trick can’t be used with Option, unless I’m missing something.)

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

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

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