Enum AccountStatus 

pub enum AccountStatus {
    LoadedNotExisting,
    Loaded,
    LoadedEmptyEIP161,
    InMemoryChange,
    Changed,
    Destroyed,
    DestroyedChanged,
    DestroyedAgain,
}

AccountStatus represents the various states an account can be in after being loaded from the database.

After account get loaded from database it can be in a lot of different states while we execute multiple transaction and even blocks over account that is in memory. This structure models all possible states that account can be in.

Variants

• LoadedNotExisting: the account has been loaded but does not exist.
• Loaded: the account has been loaded and exists.
• LoadedEmptyEIP161: the account is loaded and empty, as per EIP-161.
• InMemoryChange: there are changes in the account that exist only in memory.
• Changed: the account has been modified.
• Destroyed: the account has been destroyed.
• DestroyedChanged: the account has been destroyed and then modified.
• DestroyedAgain: the account has been destroyed again.

Variants

LoadedNotExisting

The account has been loaded but does not exist.

Loaded

The account has been loaded and exists.

LoadedEmptyEIP161

The account is loaded and empty, as per EIP-161.

InMemoryChange

There are changes in the account that exist only in memory.

Changed

The account has been modified.

Destroyed

The account has been destroyed.

DestroyedChanged

The account has been destroyed and then modified.

DestroyedAgain

The account has been destroyed again.

Implementations

impl AccountStatus

pub const fn is_not_modified(&self) -> bool

Account is not modified and just loaded from database.

pub const fn was_destroyed(&self) -> bool

Account was destroyed by calling SELFDESTRUCT. This means that full account and storage are inside memory.

pub const fn is_storage_known(&self) -> bool

This means storage is known, it can be newly created or storage got destroyed.

pub const fn is_modified_and_not_destroyed(&self) -> bool

Account is modified but not destroyed. This means that some storage values can be found in both memory and database.

pub const fn on_created(&self) -> Self

Returns the next account status on creation.

pub const fn on_touched_empty_post_eip161(&self) -> Self

Returns the next account status on touched empty account post state clear EIP (EIP-161).

pub const fn on_changed(&self, had_no_nonce_and_code: bool) -> Self

Returns the next account status on change.

pub const fn on_selfdestructed(&self) -> Self

Returns the next account status on selfdestruct.

pub fn transition(&mut self, other: Self)

Transition to other state while preserving invariance of this state.

It this account was Destroyed and other account is not:

• We should mark extended account as destroyed too.
• And as other account had some changes, extended account should be marked as DestroyedChanged.

If both account are not destroyed and if this account is in memory:

• This means that extended account is in memory too.

Otherwise, if both are destroyed or other is destroyed:

• Sets other status to extended account.

Trait Implementations

impl Clone for AccountStatus

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for AccountStatus

impl Debug for AccountStatus

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

Formats the value using the given formatter.

impl Default for AccountStatus

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for AccountStatus

Available on crate feature serde only.

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for AccountStatus

impl Hash for AccountStatus

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for AccountStatus

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to #147781)

Restrict a value to a certain range.

impl PartialEq for AccountStatus

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for AccountStatus

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for AccountStatus

Available on crate feature serde only.

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for AccountStatus

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• LoadedNotExisting: 0 bytes
• Loaded: 0 bytes
• LoadedEmptyEIP161: 0 bytes
• InMemoryChange: 0 bytes
• Changed: 0 bytes
• Destroyed: 0 bytes
• DestroyedChanged: 0 bytes
• DestroyedAgain: 0 bytes