Function array_tools::try_init_with

pub fn try_init_with<T, A, F, E>(initializer_fn: F) -> Result<A, E> where
    A: FixedSizeArray<T>,
    F: FnMut() -> Result<T, E>, 

Attempts to initialize array with values provided by function.

This function behaves much like init_with, but unlike init_with it expects function that returns Results. If Err is received, this function stops immediatly and returns received Err.

Panics

• Only panics if provided function does.

Examples

use array_tools as art;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
struct MyErr;

let mut value: u64 = 0;
let result: Result<[u64; 7], MyErr> = art::try_init_with(|| {
    let return_value = value;
    value += 1;
    Ok(return_value)
});

assert_eq!(result, Ok([0, 1, 2, 3, 4, 5, 6]));


let mut value: u64 = 0;
let result: Result<[u64; 7], MyErr> = art::try_init_with(|| {
    let return_value = value;
    value += 1;
    if value != 3 {
        Ok(return_value)
    } else {
        Err(MyErr)
    }
});

assert_eq!(result, Err(MyErr));