Enum SlotDelta 

pub enum SlotDelta {
    Add(U256),
    Sub(U256),
}

A relative storage-slot mutation: read the current value, transform it, and write it back.

Both directions saturate rather than wrap: Add clamps at U256::MAX and Sub clamps at U256::ZERO. This is the delta a caller derives from an event (e.g. an ERC-20 Transfer amount) without knowing the resulting absolute value. It is applied by StateUpdate::SlotDelta (cold-aware — see the module docs).

use alloy_primitives::U256;
use evm_fork_cache::SlotDelta;

assert_eq!(SlotDelta::Add(U256::from(50)).apply(U256::from(100)), U256::from(150));
assert_eq!(SlotDelta::Sub(U256::from(50)).apply(U256::from(30)), U256::ZERO);
assert_eq!(SlotDelta::Add(U256::from(10)).apply(U256::MAX), U256::MAX);

Variants

Add(U256)

Add to the current value, saturating at U256::MAX.

Sub(U256)

Subtract from the current value, saturating at U256::ZERO.

Implementations

impl SlotDelta

pub fn apply(self, current: U256) -> U256

Apply the (saturating) delta to a current value.

Add uses saturating_add (clamps at U256::MAX); Sub uses saturating_sub (clamps at U256::ZERO).

Trait Implementations

impl Clone for SlotDelta

fn clone(&self) -> SlotDelta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SlotDelta

impl Debug for SlotDelta

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SlotDelta

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for SlotDelta

impl PartialEq for SlotDelta

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for SlotDelta

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 SlotDelta