Struct AccountRentState 

pub struct AccountRentState {
    pub num_bytes: u64,
    pub current_slot: u64,
    pub current_lamports: u64,
    pub last_claimed_slot: u64,
}

Account state information needed for rent calculations

Fields

num_bytes: u64

Size of the account in bytes

current_slot: u64

Current blockchain slot

current_lamports: u64

Current account balance in lamports

last_claimed_slot: u64

Slot when rent was last claimed

Implementations

impl AccountRentState

pub fn get_completed_epochs(&self) -> u64

The number of complete epochs that have passed since rent was last claimed.

pub fn is_compressible( &self, config: &impl RentConfigTrait, rent_exemption_lamports: u64, ) -> Option<u64>

Check if the account is compressible based on its rent status. An account becomes compressible when it lacks sufficient rent for the current epoch + 1.

Returns

• Some(deficit): The account is compressible, returns the deficit amount including compression costs
• None: The account is not compressible

pub fn calculate_claimable_rent( &self, config: &impl RentConfigTrait, rent_exemption_lamports: u64, ) -> Option<u64>

Calculate rent that can be claimed for completed epochs.

Rent can only be claimed for fully completed epochs, not the current ongoing epoch. If the account is compressible, returns None (should compress instead of claim).

Returns

• Some(amount): Claimable rent for completed epochs
• None: Account is compressible and should be compressed instead

pub fn calculate_close_distribution( &self, config: &impl RentConfigTrait, rent_exemption_lamports: u64, ) -> CloseDistribution

Calculate how lamports are distributed when closing an account.

When a compressible account is closed:

• Completed epoch rent goes to the rent sponsor
• Partial epoch rent (unutilized) is returned to the user

Returns

A CloseDistribution specifying how lamports are split

pub fn epochs_funded_ahead( &self, config: &impl RentConfigTrait, rent_exemption_lamports: u64, ) -> u64

Calculate how many epochs AFTER the current epoch are funded.

Parameters

• config: Rent configuration (provides compression_cost and rent curve)
• rent_exemption_lamports: Solana’s required minimum balance

Returns

Number of epochs funded beyond the current epoch (0 if none)

Trait Implementations

impl Clone for AccountRentState

fn clone(&self) -> AccountRentState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AccountRentState

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

Formats the value using the given formatter.

impl Copy for AccountRentState