Struct U256 

pub struct U256(pub Uint<4>);

Tuple Fields

0: Uint<4>

Implementations

impl U256

pub fn from_usize_array(x: [usize; 8]) -> Self

pub fn to_usize_array(self) -> [usize; 8]

pub const fn from_usize(x: usize) -> Self

pub const fn resize_to_usize(self) -> usize

pub fn try_resize_to_usize(self) -> Option<usize>

impl U256

pub fn from_hex_str_fast(src: &[u8]) -> Result<Self, FromStrRadixErr>

pub const fn from_bytes_radix( src: &[u8], radix: u8, ) -> Result<Self, FromStrRadixErr>

pub const fn from_str_radix( src: &str, radix: u8, ) -> Result<Self, FromStrRadixErr>

pub fn from_dec_or_hex_str(src: &str) -> Result<Self, FromStrRadixErr>

Uses radix 16 if src has a leading 0x, otherwise uses radix 10

The uint implementation of FromStr is unsuitable because it is hexadecimal only (intentional by their developers because they did not make the mistake of using decimal in message passing implementations and do not have wasteful “0x” prefixes), this function will switch between hexadecimal and decimal depending on if there is a “0x” prefix.

pub fn from_dec_or_hex_str_restricted( src: &str, ) -> Result<Self, FromStrRadixErr>

Same as from_dec_or_hex_str but may not allow for ‘_’ or more than 78 bytes

pub fn to_hex_string_buffer(self, buf: &mut [u64; 8]) -> usize

This function is intended for formatting intermediates that use stack buffers.

Assigns a hex representation of self to buf[index..] (cast as a byte array with bytemuck) and returns the index. No prefix or minimum “0” are set (returns 64 if self.is_zero()). Also, bytes in buf[..index] may be set arbitrarily. Only b’0’-b’9’ and b’a’-b’f’ can be output to buf[index..].

pub fn to_hex_string(self) -> String

Returns a hexadecimal string representation of self, including a “0x” prefix. If self.is_zero(), this returns “0x0”

pub fn to_bytes_radix(self, radix: u8, upper: bool) -> Option<Vec<u8>>

Prefixes not included. Note: if self.is_zero, the Vec is empty.

Returns None if the radix is not valid

pub fn to_dec_string(self) -> String

pub const fn checked_exp10(exp: usize) -> Option<Self>

Returns 10^exp, or None if overflow occurs

impl U256

pub fn from_u8_array(x: [u8; 32]) -> Self

pub fn to_u8_array(self) -> [u8; 32]

pub fn from_u16_array(x: [u16; 16]) -> Self

pub fn to_u16_array(self) -> [u16; 16]

pub fn from_u32_array(x: [u32; 8]) -> Self

pub fn to_u32_array(self) -> [u32; 8]

pub fn from_u128_array(x: [u128; 2]) -> Self

pub fn to_u128_array(self) -> [u128; 2]

pub const fn from_u8(x: u8) -> Self

pub const fn resize_to_u8(self) -> u8

pub const fn from_u16(x: u16) -> Self

pub const fn resize_to_u16(self) -> u16

pub const fn from_u32(x: u32) -> Self

pub const fn resize_to_u32(self) -> u32

pub const fn from_u64(x: u64) -> Self

pub const fn resize_to_u64(self) -> u64

pub const fn try_resize_to_bool(self) -> Option<bool>

pub const fn try_resize_to_u8(self) -> Option<u8>

pub const fn try_resize_to_u16(self) -> Option<u16>

pub const fn try_resize_to_u32(self) -> Option<u32>

pub const fn try_resize_to_u64(self) -> Option<u64>

pub const fn try_resize_to_u128(self) -> Option<u128>

pub const fn from_u64_array(x: [u64; 4]) -> Self

pub const fn to_u64_array(self) -> [u64; 4]

pub const fn from_bool(x: bool) -> Self

pub const fn resize_to_bool(self) -> bool

pub const fn from_u128(x: u128) -> Self

pub const fn resize_to_u128(self) -> u128

pub const fn zero() -> Self

pub const fn one() -> Self

pub const fn max_value() -> Self

pub const fn is_zero(self) -> bool

pub const fn sig_bits(self) -> usize

Significant bits

pub fn as_u8_slice_mut(&mut self) -> &mut [u8; 32]

This gives a straight byte slice view into self, be aware that it changes on big endian systems

pub fn from_bytes(bytes: &[u8]) -> Option<Self>

Note: this is an identity: U256::from_bytes(&x0.to_u8_array()[..(32 - (x0.lz() / 8))]).unwrap()

Errors

If the number of bytes is greater than the number of bytes in Self

pub fn from_bytes_be(bytes: &[u8]) -> Option<Self>

Note: this is an identity: U256::from_bytes_be(&x0.to_u8_array_be()[(x0.lz() / 8)..]).unwrap()

Errors

If the number of bytes is greater than the number of bytes in Self

pub fn from_u8_array_be(x: [u8; 32]) -> Self

pub fn to_u8_array_be(self) -> [u8; 32]

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

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

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

pub const fn wrapping_add(self, other: Self) -> Self

pub const fn wrapping_sub(self, other: Self) -> Self

pub const fn wrapping_mul(self, other: Self) -> Self

pub const fn wrapping_shl(self, s: usize) -> Self

pub const fn wrapping_shr(self, s: usize) -> Self

pub const fn checked_add(self, rhs: Self) -> Option<Self>

pub const fn checked_sub(self, rhs: Self) -> Option<Self>

pub const fn checked_mul(self, rhs: Self) -> Option<Self>

pub const fn checked_shl(self, s: usize) -> Option<Self>

pub const fn checked_shr(self, s: usize) -> Option<Self>

pub const fn shl1(self) -> Option<Self>

Shift left by 1. Returns None if numerical overflow results

pub const fn shr1(self) -> Self

Shift right by 1

pub const fn checked_rotl(self, s: usize) -> Option<Self>

pub fn rand_using<R>(rng: &mut R) -> Self

where R: RngCore,

Randomly-assigns self using a rand_core::RngCore random number generator

// Example using the `rand_xoshiro` crate.
use rand_xoshiro::{rand_core::SeedableRng, Xoshiro128StarStar};
use u64_array_bigints::U256;

let mut rng = Xoshiro128StarStar::seed_from_u64(0);

assert_eq!(
    U256::rand_using(&mut rng),
    U256::from_u64_array([
        0x9a089d75dec9045d,
        0xc3e16405ab77d362,
        0x60dea0565c95a8da,
        0xa4290614c25a5140,
    ])
);

impl U256

These are forwarded from Uint<4>

pub const fn bw() -> usize

pub const fn lsb(&self) -> bool

pub const fn msb(&self) -> bool

pub const fn lz(&self) -> usize

pub const fn tz(&self) -> usize

pub const fn count_ones(&self) -> usize

pub const fn const_eq(&self, rhs: &Self) -> bool

pub const fn const_lt(&self, rhs: &Self) -> bool

pub const fn const_le(&self, rhs: &Self) -> bool

pub const fn const_gt(&self, rhs: &Self) -> bool

pub const fn const_ge(&self, rhs: &Self) -> bool

pub const fn overflowing_short_cin_mul(self, cin: u64, rhs: u64) -> (Self, u64)

pub const fn overflowing_short_mul_add( self, lhs: Self, rhs: u64, ) -> (Self, bool)

pub const fn overflowing_mul_add(self, lhs: Self, rhs: Self) -> (Self, bool)

pub const fn checked_short_divide(self, div: u64) -> Option<(Self, u64)>

pub const fn panicking_short_divide(self, div: u64) -> (Self, u64)

pub const fn divide(self, div: Self) -> Option<(Self, Self)>

Trait Implementations

impl BitAnd for U256

type Output = U256

The resulting type after applying the & operator.

fn bitand(self, rhs: Self) -> Self::Output

Performs the & operation.

impl BitAndAssign for U256

fn bitand_assign(&mut self, rhs: Self)

Performs the &= operation.

impl BitOr for U256

type Output = U256

The resulting type after applying the | operator.

fn bitor(self, rhs: Self) -> Self::Output

Performs the | operation.

impl BitOrAssign for U256

fn bitor_assign(&mut self, rhs: Self)

Performs the |= operation.

impl BitXor for U256

type Output = U256

The resulting type after applying the ^ operator.

fn bitxor(self, rhs: Self) -> Self::Output

Performs the ^ operation.

impl BitXorAssign for U256

fn bitxor_assign(&mut self, rhs: Self)

Performs the ^= operation.

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 Debug for U256

Available on non-crate feature use_parity_uint only.

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

Formats the value using the given formatter.

impl Default for U256

fn default() -> Self

Returns the “default value” for a type.

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

Available on crate feature serde_support only.

fn deserialize<D>(deserializer: D) -> Result<U256, D::Error>

where D: Deserializer<'de>,

Tries Deserializer::deserialize_str and feeds it to from_dec_or_hex_str_restricted, else uses Deserializer::deserialize_u64.

impl Display for U256

Available on non-crate feature use_parity_uint only.

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

Formats the value using the given formatter.

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, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl LowerHex for U256

Available on non-crate feature use_parity_uint only.

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

Formats the value using the given formatter.

impl Not for U256

type Output = U256

The resulting type after applying the ! operator.

fn not(self) -> Self::Output

Performs the unary ! 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

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 U256

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

Available on crate feature serde_support only.

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

where S: Serializer,

Includes a “0x” prefix.

impl Copy for U256

impl Eq for U256

impl StructuralPartialEq for U256