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".

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