Trait eitherable::Eitherable

pub trait Eitherable {
    // Required methods
    fn either<L, R>(&self, left: L, right: R) -> Either<L, R> ;
    fn either_else<L, FL: FnOnce() -> L, R, FR: FnOnce() -> R>(
        &self,
        l_func: FL,
        r_func: FR
    ) -> Either<L, R> ;
}

Extention trait to create the Either type from a boolean. Can be implemented on any type.

Required Methods

fn either<L, R>(&self, left: L, right: R) -> Either<L, R>

If the boolean is true, returns Either::Left(left). If it is false, returns Either::Right(right). left and right are evaluated eagerly. For lazy evaluation, use either_else()

Examples

use eitherable::*;

let x = true;
assert_eq!(x.either(1, "right"), Either::Left(1));

let x = false;
assert_eq!(x.either(1, "right"), Either::Right("right"));

fn either_else<L, FL: FnOnce() -> L, R, FR: FnOnce() -> R>( &self, l_func: FL, r_func: FR ) -> Either<L, R>

Same as either(), but the values are lazily evaluated.

Examples

use eitherable::*;

let x = true;
assert_eq!(x.either_else(|| 1,|| "right"), Either::Left(1));

let x = false;
assert_eq!(x.either_else(|| 1,|| "right"), Either::Right("right"));

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl Eitherable for bool

fn either<L, R>(&self, left: L, right: R) -> Either<L, R>

fn either_else<L, FL: FnOnce() -> L, R, FR: FnOnce() -> R>( &self, l_func: FL, r_func: FR ) -> Either<L, R>

Implementors