Struct ItemData 

pub struct ItemData<T> { /* private fields */ }

A value kept in the data of the stack a player holds, at its key (the mod’s own: <mod>:<key>); its default where the stack has none yet.

static CHARGES: ItemData<u32> = ItemData::new("charges");
CHARGES.update(&use_item.player, use_item.off_hand, |n| *n = n.saturating_sub(1));

Implementations

impl<T: Schema + Default> ItemData<T>

pub const fn new(key: &'static str) -> Self

pub fn get(&self, player: &str, off_hand: bool) -> T

The value on the stack player holds (off_hand: in its other hand); its default when the stack has none (or there’s no stack).

pub fn held_here(&self, off_hand: bool) -> T

The value on the stack this client’s player holds (off_hand: in its other hand), as the server last sent the stack — the game sends stacks, so every ItemData is synced; its default when the stack has none (or there’s no stack).

pub fn set(&self, player: &str, off_hand: bool, value: &T) -> bool

Puts value on the stack player holds; false when it holds nothing.

pub fn update<R>( &self, player: &str, off_hand: bool, change: impl FnOnce(&mut T) -> R, ) -> Option<R>

The value on the stack player holds changed by change, and put back; what change returns, none when it holds nothing.