Struct ethereum_types::U256

#[repr(C)]
pub struct U256(pub [u64; 4]);

Little-endian large integer type

Methods

impl U256

pub fn from_dec_str(value: &str) -> Result<Self, FromDecStrErr>

Convert from a decimal string.

pub fn low_u32(&self) -> u32

Conversion to u32

pub fn low_u64(&self) -> u64

Conversion to u64

pub fn as_u32(&self) -> u32

Conversion to u32 with overflow checking

Panics

Panics if the number is larger than 2^32.

pub fn as_u64(&self) -> u64

Conversion to u64 with overflow checking

Panics

Panics if the number is larger than 2^64.

pub fn is_zero(&self) -> bool

Whether this is zero.

pub fn bits(&self) -> usize

Return the least number of bits needed to represent the number

pub fn bit(&self, index: usize) -> bool

Return if specific bit is set.

Panics

Panics if index exceeds the bit width of the number.

pub fn leading_zeros(&self) -> u32

Returns the number of leading zeros in the binary representation of self.

pub fn trailing_zeros(&self) -> u32

Returns the number of leading zeros in the binary representation of self.

pub fn byte(&self, index: usize) -> u8

Return specific byte.

Panics

Panics if index exceeds the byte width of the number.

pub fn to_big_endian(&self, bytes: &mut [u8])

Write to the slice in big-endian format.

pub fn to_little_endian(&self, bytes: &mut [u8])

Write to the slice in little-endian format.

pub fn exp10(n: usize) -> Self

Create 10**n as this type.

Panics

Panics if the result overflows the type.

pub fn zero() -> Self

Zero (additive identity) of this type.

pub fn one() -> Self

One (multiplicative identity) of this type.

pub fn max_value() -> Self

The maximum value which can be inhabited by this type.

pub fn pow(self, expon: Self) -> Self

Fast exponentation by squaring https://en.wikipedia.org/wiki/Exponentiation_by_squaring

Panics

Panics if the result overflows the type.

pub fn overflowing_pow(self, expon: Self) -> (Self, bool)

Fast exponentation by squaring https://en.wikipedia.org/wiki/Exponentiation_by_squaring

pub fn overflowing_add(self, other: U256) -> (U256, bool)

Optimized instructions

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

Addition which saturates at the maximum value.

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

Checked addition. Returns None if overflow occurred.

pub fn overflowing_sub(self, other: U256) -> (U256, bool)

Subtraction which underflows and returns a flag if it does.

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

Subtraction which saturates at zero.

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

Checked subtraction. Returns None if overflow occurred.

pub fn overflowing_mul(self, other: U256) -> (U256, bool)

Multiply with overflow, returning a flag if it does.

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

Multiplication which saturates at the maximum value..

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

Checked multiplication. Returns None if overflow occurred.

pub fn overflowing_div(self, other: U256) -> (U256, bool)

Division with overflow

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

Checked division. Returns None if other == 0.

pub fn overflowing_rem(self, other: U256) -> (U256, bool)

Modulus with overflow.

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

Checked modulus. Returns None if other == 0.

pub fn overflowing_neg(self) -> (U256, bool)

Negation with overflow.

pub fn checked_neg(self) -> Option<U256>

Checked negation. Returns None unless self == 0.

pub fn mul_u32(self, other: u32) -> Self

Deprecated

: Use Mul<u32> instead.

Multiplication by u32

pub fn to_hex(&self) -> String

Deprecated

: Use LowerHex instead.

Convert to hex string.

pub fn from_big_endian(slice: &[u8]) -> Self

Converts from big endian representation bytes in memory Can also be used as (&slice).into(), as it is default From slice implementation for U256

pub fn from_little_endian(slice: &[u8]) -> Self

Converts from little endian representation bytes in memory

impl U256

pub fn full_mul(self, other: U256) -> U512

Multiplies two 256-bit integers to produce full 512-bit integer No overflow possible

Trait Implementations

impl From<U256> for H256

fn from(value: U256) -> Self

Performs the conversion.

impl<'a> From<&'a U256> for H256

fn from(value: &'a U256) -> Self

Performs the conversion.

impl From<H256> for U256

fn from(value: H256) -> Self

Performs the conversion.

impl<'a> From<&'a H256> for U256

fn from(value: &'a H256) -> Self

Performs the conversion.

impl Copy for U256

impl Clone for U256

fn clone(&self) -> U256

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Eq for U256

impl PartialEq for U256

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl Hash for U256

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,

Feeds a slice of this type into the given [Hasher].

impl AsRef<U256> for U256

fn as_ref(&self) -> &U256

Performs the conversion.

impl Default for U256

fn default() -> Self

Returns the "default value" for a type.

impl From<u64> for U256

fn from(value: u64) -> U256

Performs the conversion.

impl From<u8> for U256

fn from(value: u8) -> U256

Performs the conversion.

impl From<u16> for U256

fn from(value: u16) -> U256

Performs the conversion.

impl From<u32> for U256

fn from(value: u32) -> U256

Performs the conversion.

impl From<usize> for U256

fn from(value: usize) -> U256

Performs the conversion.

impl From<i64> for U256

fn from(value: i64) -> U256

Performs the conversion.

impl From<i8> for U256

fn from(value: i8) -> U256

Performs the conversion.

impl From<i16> for U256

fn from(value: i16) -> U256

Performs the conversion.

impl From<i32> for U256

fn from(value: i32) -> U256

Performs the conversion.

impl From<isize> for U256

fn from(value: isize) -> U256

Performs the conversion.

impl<'a> From<&'a [u8]> for U256

fn from(bytes: &[u8]) -> U256

Performs the conversion.

impl Add<U256> for U256

type Output = U256

The resulting type after applying the + operator.

fn add(self, other: U256) -> U256

Performs the + operation.

impl Sub<U256> for U256

type Output = U256

The resulting type after applying the - operator.

fn sub(self, other: U256) -> U256

Performs the - operation.

impl Mul<u32> for U256

type Output = U256

The resulting type after applying the * operator.

fn mul(self, other: u32) -> U256

Performs the * operation.

impl Mul<U256> for U256

type Output = U256

The resulting type after applying the * operator.

fn mul(self, other: U256) -> U256

Performs the * operation.

impl Div<U256> for U256

type Output = U256

The resulting type after applying the / operator.

fn div(self, other: U256) -> U256

Performs the / operation.

impl Rem<U256> for U256

type Output = U256

The resulting type after applying the % operator.

fn rem(self, other: U256) -> U256

Performs the % operation.

impl BitAnd<U256> for U256

type Output = U256

The resulting type after applying the & operator.

fn bitand(self, other: U256) -> U256

Performs the & operation.

impl BitXor<U256> for U256

type Output = U256

The resulting type after applying the ^ operator.

fn bitxor(self, other: U256) -> U256

Performs the ^ operation.

impl BitOr<U256> for U256

type Output = U256

The resulting type after applying the | operator.

fn bitor(self, other: U256) -> U256

Performs the | operation.

impl Not for U256

type Output = U256

The resulting type after applying the ! operator.

fn not(self) -> U256

Performs the unary ! operation.

impl Shl<usize> for U256

type Output = U256

The resulting type after applying the << operator.

fn shl(self, shift: usize) -> U256

Performs the << operation.

impl Shr<usize> for U256

type Output = U256

The resulting type after applying the >> operator.

fn shr(self, shift: usize) -> U256

Performs the >> operation.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Debug for U256

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

Formats the value using the given formatter.

impl Display for U256

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

Formats the value using the given formatter.

impl FromStr for U256

type Err = FromHexError

The associated error which can be returned from parsing.

fn from_str(value: &str) -> Result<U256, Self::Err>

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

impl LowerHex for U256

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

Formats the value using the given formatter.

impl From<&'static str> for U256

fn from(s: &'static str) -> Self

Performs the conversion.

impl HeapSizeOf for U256

fn heap_size_of_children(&self) -> usize

Measure the size of any heap-allocated structures that hang off this value, but not the space taken up by the value itself (i.e. what size_of:: measures, more or less); that space is handled by the implementation of HeapSizeOf for Box below.

impl Serialize for U256

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

Serialize this value into the given Serde serializer.

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

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

Deserialize this value from the given Serde deserializer.

impl From<U256> for U512

fn from(value: U256) -> U512

Performs the conversion.

impl From<U512> for U256

fn from(value: U512) -> U256

Performs the conversion.

impl<'a> From<&'a U256> for U512

fn from(value: &'a U256) -> U512

Performs the conversion.

impl<'a> From<&'a U512> for U256

fn from(value: &'a U512) -> U256

Performs the conversion.

impl From<U256> for U128

fn from(value: U256) -> U128

Performs the conversion.

impl From<U128> for U256

fn from(value: U128) -> U256

Performs the conversion.

impl From<U256> for u64

fn from(value: U256) -> u64

Performs the conversion.

impl From<U256> for u32

fn from(value: U256) -> u32

Performs the conversion.

impl<'a> From<&'a [u8; 32]> for U256

fn from(bytes: &[u8; 32]) -> Self

Performs the conversion.

impl From<[u8; 32]> for U256

fn from(bytes: [u8; 32]) -> Self

Performs the conversion.

impl From<U256> for [u8; 32]

fn from(number: U256) -> Self

Performs the conversion.