Struct stack_vm::WriteOnceTable

pub struct WriteOnceTable<T>(_);

A table which does not allow values to be overwritten. Useful for your languages constants, etc.

use stack_vm::{WriteOnceTable, Table};
let mut table: WriteOnceTable<usize> = WriteOnceTable::new();
assert!(table.is_empty());

table.insert("example", 13);
assert!(!table.is_empty());

assert!(table.contains_key("example"));

let value = *table.get("example").unwrap();
assert_eq!(value, 13);

use stack_vm::{WriteOnceTable, Table};
let mut table: WriteOnceTable<usize> = WriteOnceTable::new();
table.insert("example", 13);
table.insert("example", 14);

Methods

impl<T> WriteOnceTable<T>

pub fn new() -> WriteOnceTable<T>

Return a new, empty WriteOnceTable.

pub fn keys(&self) -> Vec<String>

Trait Implementations

impl<T> Table for WriteOnceTable<T>

type Item = T

The type for items stored and retrieved from the table.

fn insert(&mut self, name: &str, value: T)

Insert a value into the table using a string key.

fn is_empty(&self) -> bool

Is the table empty or not?

fn contains_key(&self, name: &str) -> bool

Does the table contain the key or not?

fn get(&self, name: &str) -> Option<&T>

Retrieve a reference to a value stored in the table by key.

impl<T: Default> Default for WriteOnceTable<T>

fn default() -> WriteOnceTable<T>

Returns the "default value" for a type.

impl<T: Debug> Debug for WriteOnceTable<T>

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.