Trait MapRef 

pub trait MapRef<T, E> {
    // Required method
    fn map_ref<U, F>(self, op: F) -> Result<U, E>
       where F: FnOnce(&T) -> U;
}

Maps a successful result through a shared reference to its value.

The operation borrows the owned success value for the duration of the callback. An existing error is forwarded unchanged.

Required Methods

fn map_ref<U, F>(self, op: F) -> Result<U, E>

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

Applies op to a shared reference inside an Ok result.

The original success value is dropped after the callback returns. An Err result bypasses the callback and preserves its error.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors

impl<T, E> MapRef<T, E> for Result<T, E>