frame_plugins::balances

Struct ModelDeposit

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pub struct ModelDeposit;
Expand description

Deposit plugin family’s child model over the LazyBalance’s compile-time marker via ShareBalanceContext.

Bound to ShareBalanceFamily via LazyBalanceRoot::Deposit.

§Overview

Accepts an asset deposit and issues a LazyBalance::Receipt representing a proportional claim over the balance along with the total deposited amount.

Effects:

  • increases effective
  • increases issued (shares)
  • returns a receipt encoding the depositor’s stake

§Share Derivation

Shares are computed relative to current state:

  • issued == 0 -> shares = asset (bootstrap)
  • otherwise -> shares = asset / bias (share-price)

where bias = effective / issued.

Rational results are floored when converting to integer shares, preventing implicit value creation and allowing fractional dust to accumulate.

§Constraints

  • zero-value deposits are rejected
  • fresh balances are initialized on first deposit
  • deposits are disallowed if bias == 0 && issued != 0 (fully drained state; requires mint to recover the bias)

§Receipt

The issued LazyBalance::Receipt contains:

  • principal : deposited value
  • shares : issued shares
  • bias : balance bias
  • checkpoint: balance checkpoint

Receipts encode relative ownership, not fixed value.

Trait Implementations§

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impl Debug for ModelDeposit

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

Formats the value using the given formatter. Read more
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impl Default for ModelDeposit

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fn default() -> ModelDeposit

Returns the “default value” for a type. Read more
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impl<'a, T, In, Out> PurePluginModel<In, ShareBalanceContext<T>, Out> for ModelDeposit
where T: LazyBalance<Input<'a> = In, Output<'a> = Out>, Context<T>: VirtualError<LazyBalanceError, Error = ShareBalanceError>, Out: LazyBalanceOutput<'a, T::Asset, T::Receipt, T::SnapShot, T::Time, T::Limits, T>, In: LazyBalanceInput<'a, T::Balance, T::Variant, T::Id, T::Asset, T::Receipt, T>, T::Asset: From<<T::Rational as FixedPointNumber>::Inner>,

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fn compute(&self, input: In, _context: &ShareBalanceContext<T>) -> Out

Computes the model’s output for a given immutable input and context.

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