Trait FrozenBalance

pub trait FrozenBalance<AssetId, AccountId, Balance> {
    // Required methods
    fn frozen_balance(asset: AssetId, who: &AccountId) -> Option<Balance>;
    fn died(asset: AssetId, who: &AccountId);
    fn contains_freezes(asset: AssetId) -> bool;
}

Trait for allowing a minimum balance on the account to be specified, beyond the minimum_balance of the asset. This is additive - the minimum_balance of the asset must be met and then anything here in addition.

Required Methods

fn frozen_balance(asset: AssetId, who: &AccountId) -> Option<Balance>

Return the frozen balance.

Generally, the balance of every account must be at least the sum of this (if Some) and the asset’s minimum_balance (the latter since there may be complications to destroying an asset’s account completely).

Under normal behaviour, the account balance should not go below the sum of this (if Some) and the asset’s minimum balance. However, the account balance may reasonably begin below this sum (e.g. if less than the sum had ever been transferred into the account).

In special cases (privileged intervention) the account balance may also go below the sum.

If None is returned, then nothing special is enforced.

fn died(asset: AssetId, who: &AccountId)

Called after an account has been removed.

fn contains_freezes(asset: AssetId) -> bool

Return a value that indicates if there are registered freezes for a given asset.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<AssetId, AccountId, Balance> FrozenBalance<AssetId, AccountId, Balance> for ()

fn frozen_balance(_: AssetId, _: &AccountId) -> Option<Balance>

fn died(_: AssetId, _: &AccountId)

fn contains_freezes(_: AssetId) -> bool

Implementors

impl<T: Config<I>, I: 'static> FrozenBalance<<T as Config<I>>::AssetId, <T as Config>::AccountId, <T as Config<I>>::Balance> for Pallet<T, I>