Struct U256 

pub struct U256(/* private fields */);

An unsigned 256-bit integer. The limbs are most significant first, so the derived order is the numeric one.

Implementations

impl U256

pub fn to_dec(self, decimals: u32) -> Result<Dec, BadAmount>

The amount as a decimal of decimals places: wei at 18 is the coin. Exact, or refused: past eighteen places the digits a Dec cannot keep must be zero.

pub fn from_dec(value: Dec, decimals: u32) -> Result<U256, BadAmount>

value counted in 10^-decimals: 1.5 at 18 is 1.5e18 wei. A value finer than decimals is refused, never rounded.

impl U256

pub fn from_quantity(text: &str) -> Result<U256, BadQuantity>

0x and hex digits, as JSON-RPC writes a quantity. Leading zeros are read (eth_call answers a whole word) and 0x alone is zero.

pub fn to_quantity(self) -> String

0x and the hex digits without leading zeros; zero is 0x0.

pub fn from_decimal(text: &str) -> Result<U256, BadQuantity>

Decimal digits and nothing else.

impl U256

pub const ZERO: U256

pub const ONE: U256

pub const MAX: U256

pub const fn from_u64(value: u64) -> U256

pub const fn from_u128(value: u128) -> U256

pub fn from_be_bytes(bytes: [u8; 32]) -> U256

pub fn to_be_bytes(self) -> [u8; 32]

pub fn from_be_slice(bytes: &[u8]) -> Option<U256>

Up to 32 big-endian bytes, a shorter run read as if zero-padded on the left.

pub fn to_be_trimmed(self) -> Vec<u8>

The value as big-endian bytes with no leading zeros; zero is empty.

pub const fn is_zero(self) -> bool

pub const fn to_u64(self) -> Option<u64>

pub const fn to_u128(self) -> Option<u128>

pub fn bits(self) -> u32

How many bits the value needs: 0 for zero, 256 for U256::MAX.

pub fn checked_add(self, other: U256) -> Option<U256>

pub fn checked_sub(self, other: U256) -> Option<U256>

pub fn checked_mul(self, other: U256) -> Option<U256>

pub fn saturating_add(self, other: U256) -> U256

pub fn saturating_mul(self, other: U256) -> U256

pub fn ten_to(power: u32) -> Option<U256>

10^power, while it fits: up to 10^77.

pub fn div_rem_u64(self, divisor: u64) -> Option<(U256, u64)>

The quotient and remainder of a division by a nonzero u64.

pub fn div_rem(self, divisor: U256) -> Option<(U256, U256)>

The quotient and remainder of a division by a nonzero divisor, by long division one bit at a time.

Trait Implementations

impl Clone for U256

fn clone(&self) -> U256

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for U256

impl Debug for U256

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

Formats the value using the given formatter.

impl Default for U256

fn default() -> U256

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for U256

A quantity string. A bare JSON number is refused: it may have been a float.

fn deserialize<D>( deserializer: D, ) -> Result<U256, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for U256

Decimal, the way a person reads it.

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

Formats the value using the given formatter.

impl Eq for U256

impl From<B256> for U256

fn from(word: B256) -> U256

Converts to this type from the input type.

impl From<U256> for B256

fn from(value: U256) -> B256

Converts to this type from the input type.

impl From<u8> for U256

fn from(value: u8) -> U256

Converts to this type from the input type.

impl From<u16> for U256

fn from(value: u16) -> U256

Converts to this type from the input type.

impl From<u32> for U256

fn from(value: u32) -> U256

Converts to this type from the input type.

impl From<u64> for U256

fn from(value: u64) -> U256

Converts to this type from the input type.

impl From<u128> for U256

fn from(value: u128) -> U256

Converts to this type from the input type.

impl FromStr for U256

A quantity when it starts with 0x, decimal digits otherwise.

type Err = BadQuantity

The associated error which can be returned from parsing.

fn from_str(text: &str) -> Result<U256, BadQuantity>

Parses a string s to return a value of this type.

impl Hash for U256

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

where __H: Hasher,

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 U256

fn cmp(&self, other: &U256) -> 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)

Restrict a value to a certain range.

impl PartialEq for U256

fn eq(&self, other: &U256) -> bool

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for U256

fn partial_cmp(&self, other: &U256) -> 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 U256

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for U256