Trait rs_std_ext::result::ResultExt

pub trait ResultExt<T, E> {
    // Required methods
    fn tap_mut(self, f: impl FnOnce(&mut T)) -> Result<T, E>;
    fn tap_err_mut(self, f: impl FnOnce(&mut E)) -> Result<T, E>;
    fn swap(self) -> Result<E, T>;
}

Extension methods for std::result::Result.

Required Methods

fn tap_mut(self, f: impl FnOnce(&mut T)) -> Result<T, E>

Tap into a Result and modify its Ok value.

This method captures the Result in order not to break the caller-chain.

Example

use rs_std_ext::result::ResultExt;
 
let mut x: Result<String, usize> = Ok("4".into());
assert_eq!(x.tap_mut(|s| s.push('2')), Ok("42".into()));

fn tap_err_mut(self, f: impl FnOnce(&mut E)) -> Result<T, E>

Tap into a Result and modify its Err value.

This method captures the Result in order not to break the caller-chain.

Example

use rs_std_ext::result::ResultExt;
 
let mut x: Result<String, usize> = Err(40);
assert_eq!(x.tap_err_mut(|s| *s += 2), Err(42));

fn swap(self) -> Result<E, T>

Swap the Ok and Err values of a Result.

Example

use rs_std_ext::result::ResultExt;
 
let x: Result<&str, usize> = Ok("foo");
assert_eq!(x.swap(), Err("foo"));

Object Safety

This trait is not object safe.

Implementations on Foreign Types

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

fn tap_mut(self, f: impl FnOnce(&mut T)) -> Result<T, E>

fn tap_err_mut(self, f: impl FnOnce(&mut E)) -> Result<T, E>

fn swap(self) -> Result<E, T>

Implementors