Struct U256 

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

IcyDB-owned fixed-width unsigned 256-bit scalar.

Runtime values are inline and allocation-free. Candid exposes this type as nat; ingress rejects values greater than U256::MAX. Persistence and index encodings are owned separately by IcyDB.

Implementations

impl U256

pub const MIN: U256 = Self::ZERO

Minimum unsigned 256-bit value.

pub const ZERO: U256

Zero.

pub const ONE: U256

One.

pub const MAX: U256

Maximum unsigned 256-bit value.

pub const fn from_words(high: u128, low: u128) -> U256

Build from two 128-bit words in numeric high/low order.

pub const fn into_words(self) -> (u128, u128)

Split into two 128-bit words in numeric high/low order.

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

Build from exactly 32 unsigned big-endian bytes.

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

Return exactly 32 unsigned big-endian bytes.

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

Convert to u128 when the value is in range.

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

Add two values, returning None on unsigned 256-bit overflow.

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

Subtract two values, returning None on unsigned 256-bit underflow.

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

Multiply two values, returning None on unsigned 256-bit overflow.

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

Divide two values, returning None when the divisor is zero.

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

Return the remainder, or None when the divisor is zero.

Trait Implementations

impl CandidType for U256

fn ty() -> Type

fn _ty() -> Type

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

where S: Serializer,

fn id() -> TypeId

fn _ty_doc() -> TypeDoc

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, formatter: &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

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

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

Formats the value using the given formatter.

impl Eq for U256

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

type Err = ParseU256Error

The associated error which can be returned from parsing.

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

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 NormalizeAuto for U256

fn normalize_self(&mut self, _ctx: &mut dyn VisitorContext)

impl NormalizeCustom for U256

fn normalize_custom(&mut self, _ctx: &mut dyn VisitorContext)

impl NumericValue for U256

fn try_to_decimal(&self) -> Option<Decimal>

Convert this value into Decimal for generic numeric handling.

fn try_from_decimal(value: Decimal) -> Option<U256>

Rebuild the value from Decimal after generic numeric handling.

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

impl ValidateAuto for U256

fn validate_self(&self, _ctx: &mut dyn VisitorContext)

impl ValidateCustom for U256

fn validate_custom(&self, _ctx: &mut dyn VisitorContext)

impl Visitable for U256

fn type_identity(&self) -> &'static str

Return the concrete Rust application-value type used for callback diagnostics.

fn drive(&self, _: &mut dyn VisitorCore)

fn drive_mut(&mut self, _: &mut dyn VisitorMutCore)