Struct CostChange 

pub struct CostChange { /* private fields */ }

A Gas counter for calculating gas consumption.

Gas cost can be increased or reduced during transition. In some situations, the total increase amount must be bounded regardless of how large is the reduce amount. Hence, there are two counters keep track on the both positive and negative side of the value, named deduct and reward. The counter deduct is to be checked if it exceeds certain limit at some point, while the counter reward is used at the end of the process to calculate the final gas cost by compensating it.

Example:

let mut change = CostChange::default(); // = 0
change += CostChange::reward(1); // = 1
change += CostChange::deduct(2); // = -1
assert_eq!(change.values().0, 1);

Implementations

impl CostChange

pub const fn deduct(value: u64) -> Self

pub const fn reward(value: u64) -> Self

pub fn values(&self) -> (u64, u64)

Trait Implementations

impl Add for CostChange

type Output = CostChange

The resulting type after applying the + operator.

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

Performs the + operation.

impl AddAssign for CostChange

fn add_assign(&mut self, rhs: Self)

Performs the += operation.

impl Clone for CostChange

fn clone(&self) -> CostChange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CostChange

impl Debug for CostChange

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

Formats the value using the given formatter.

impl Default for CostChange

fn default() -> CostChange

Returns the “default value” for a type.

impl Sub for CostChange

type Output = CostChange

The resulting type after applying the - operator.

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

Performs the - operation.

impl SubAssign for CostChange

fn sub_assign(&mut self, rhs: Self)

Performs the -= operation.