Struct Work

pub struct Work(/* private fields */);

A 128-bit unsigned “Work” value.

Used to calculate the total work for each chain of blocks.

Consensus

The relative value of Work is consensus-critical, because it is used to choose the best chain. But its precise value and bit pattern are not consensus-critical.

We calculate work values according to the Zcash specification, but store them as u128, rather than the implied u256. We don’t expect the total chain work to ever exceed 2^128. The current total chain work for Zcash is 2^58, and Bitcoin adds around 2^91 work per year. (Each extra bit represents twice as much work.)

a node chooses the “best” block chain visible to it by finding the chain of valid blocks with the greatest total work. The work of a block with value nBits for the nBits field in its block header is defined as floor(2^256 / (ToTarget(nBits) + 1)).

Zcash Specification section 7.7.5.

Implementations

impl Work

pub fn zero() -> Self

Returns a value representing no work.

pub fn as_u128(self) -> u128

Return the inner u128 value.

Trait Implementations

impl Add<Work> for PartialCumulativeWork

type Output = PartialCumulativeWork

The resulting type after applying the + operator.

fn add(self, rhs: Work) -> Self::Output

Performs the + operation.

impl Add for Work

type Output = PartialCumulativeWork

The resulting type after applying the + operator.

fn add(self, rhs: Work) -> PartialCumulativeWork

Performs the + operation.

impl AddAssign<Work> for PartialCumulativeWork

fn add_assign(&mut self, rhs: Work)

Performs the += operation.

impl Clone for Work

fn clone(&self) -> Work

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Work

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

Formats the value using the given formatter.

impl Default for Work

fn default() -> Work

Returns the “default value” for a type.

impl From<Work> for PartialCumulativeWork

fn from(work: Work) -> Self

Converts to this type from the input type.

impl Ord for Work

fn cmp(&self, other: &Work) -> 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.

impl PartialEq for Work

fn eq(&self, other: &Work) -> 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 PartialOrd for Work

fn partial_cmp(&self, other: &Work) -> 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 Sub<Work> for PartialCumulativeWork

type Output = PartialCumulativeWork

The resulting type after applying the - operator.

fn sub(self, rhs: Work) -> Self::Output

Performs the - operation.

impl SubAssign<Work> for PartialCumulativeWork

fn sub_assign(&mut self, rhs: Work)

Performs the -= operation.

impl TryFrom<ExpandedDifficulty> for Work

type Error = ()

The type returned in the event of a conversion error.

fn try_from(expanded: ExpandedDifficulty) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for Work

impl Eq for Work

impl StructuralPartialEq for Work