Struct List 

pub struct List<T> {
    pub data: Vec<T>,
}

A list provides fixed-width unit store.

identity: usize - 1-based integer (0 is the null sentinel) schema: usize - unit size in T error: ListError value: [T]

use context_engine::list::List;
use context_engine::required::SetOutcome;

let mut list: List<u32> = List::new(2);

// append: first real entry is id=1
let r = list.set(&0, &mut 2, &[10u32, 20], false).unwrap();
assert!(matches!(r, SetOutcome::Created(1)));
assert_eq!(list.get(&1, &2).unwrap(), &[10u32, 20]);

// update
let r = list.set(&1, &mut 2, &[30u32, 40], false).unwrap();
assert!(matches!(r, SetOutcome::Updated));
assert_eq!(list.get(&1, &2).unwrap(), &[30u32, 40]);

// delete then reuse_vacant
list.delete(&1, &mut 2).unwrap();
assert!(list.get(&1, &2).is_err());
let r = list.set(&0, &mut 2, &[50u32, 60], true).unwrap();
assert!(matches!(r, SetOutcome::Created(1)));

Fields

data: Vec<T>

Implementations

impl<T: Copy + Default + PartialEq> List<T>

pub fn new(width: usize) -> Self

impl<T: Copy + Default + PartialEq> List<T>

pub fn get<'a>( &'a self, identity: &usize, schema: &usize, ) -> Result<&'a [T], ListError>

pub fn set( &mut self, identity: &usize, schema: &mut usize, value: &[T], reuse_vacant: bool, ) -> Result<SetOutcome, ListError>

intern: if true and identity=0, return first match value identity(i)

pub fn delete( &mut self, identity: &usize, schema: &mut usize, ) -> Result<(), ListError>