Struct AccumulatorMap 

pub struct AccumulatorMap<K> { /* private fields */ }

A map from keys to 128-bit unsigned integers that act as accumulators.

Implementations

impl<K> AccumulatorMap<K>

where K: ObjectKey,

pub fn get<'a, L>( &self, ctx: &Context<'_>, key: L, ) -> Result<u128, ClientError<u8>>

where L: Borrow<<K as ObjectValue>::In<'a>>,

Gets the current value for the given key, defaulting always to 0.

pub fn add<'a, L>( &self, ctx: &mut Context<'_>, key: L, value: u128, ) -> Result<u128, ClientError<u8>>

where L: Borrow<<K as ObjectValue>::In<'a>>,

Adds the given value to the current value for the given key.

pub fn safe_sub<'a, L>( &self, ctx: &mut Context<'_>, key: L, value: u128, ) -> Result<u128, ClientError<SafeSubError>>

where L: Borrow<<K as ObjectValue>::In<'a>>,

Subtracts the given value from the current value for the given key, returning an error if the subtraction would result in a negative value.

Trait Implementations

impl<K> StateObjectResource for AccumulatorMap<K>

unsafe fn new( scope: &[u8], prefix: u8, ) -> Result<AccumulatorMap<K>, InitializationError>

Creates a new resource. This should only be called in generated code. Do not call this function directly.