Uint256 class - u256 library

Constructors

Uint256(int value): Builds from a plain Dart int. Must be non-negative (same constraint as Uint64.new).
factory
Uint256.from(int value): Builds from a plain Dart int, accepting negative values by taking their two's-complement bit pattern (masked to 256 bits) instead of throwing like Uint256.new does — e.g. Uint256.from(-1) == Uint256.max. value must itself be a normal double-safe Dart int (|value| <= 2^53); BigInt-free, same limb-splitting negation trick as Uint64.from, sign-extended into the three high limbs.
factory
Uint256.fromBigInt(BigInt value): factory
Uint256.fromUint64(Uint64 value): factory
Uint256.unsafe(Uint64 _d3, Uint64 _d2, Uint64 _d1, Uint64 _d0): Raw limb constructor (most-significant limb first) — prefer Uint256.new / Uint256.fromBigInt for arbitrary values.
const

d0 → Uint64: no setter
d1 → Uint64: no setter
d2 → Uint64: no setter
d3 → Uint64: no setter
hashCode → int: The hash code for this object.
no setteroverride
isEven → bool: no setter
isOdd → bool: no setter
isZero → bool: no setter
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

addChecked(Uint256 other) → Uint256
compareTo(Uint256 other) → int: Compares this object to another object.
override
mulChecked(Uint256 other) → Uint256
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
subChecked(Uint256 other) → Uint256
toBigInt() → BigInt
toBytes([Endian endian = Endian.big]) → List<int>: Fixed 32-byte encoding, delegating to each Uint64 limb's own (already web-safe) 8-byte encoding.
toHexString({bool padded = true}) → String
toInt() → int: Only safe if the top three limbs are zero and the low limb is double-safe — delegates to Uint64.toInt()'s own guard, throwing IntegerError otherwise (use toBigInt for the general case).
toInt128() → Int128: Truncating narrow, then reinterpret (wrapping, like a Rust as i128 cast).
toInt32() → Int32: Truncating narrow, then reinterpret (wrapping, like a Rust as i32 cast).
toInt64() → Int64: Truncating narrow, then reinterpret (wrapping, like a Rust as i64 cast).
toString() → String: A string representation of this object.
override
toUint128() → Uint128: Truncating narrow: keeps only the low 128 bits (wrapping, like a Rust as u128 cast).
toUint32() → Uint32: Truncating narrow: keeps only the low 32 bits (wrapping, like a Rust as u32 cast).
toUint64() → Uint64: Truncating narrow: keeps only the low 64 bits (wrapping, like a Rust as u64 cast).

operator %(Uint256 other) → Uint256
operator &(Uint256 other) → Uint256
operator *(Uint256 other) → Uint256: Multiply, keeping only the low 256 bits (wrapping). Row-scanning (operand-scanning) schoolbook multiply: for each limb a[i] of this, walk every limb b[j] of other and accumulate a[i]*b[j] into acc[i+j], threading carry from acc[i+j] to acc[i+j+1] via Uint64.mac — the same single-carry-chain pattern Uint64.operator* itself uses one level down (multiply one operand by a single digit of the other, adding into a result array with carry propagating to the next position).
operator +(Uint256 other) → Uint256
operator -(Uint256 other) → Uint256
operator <(Uint256 other) → bool
operator <<(int n) → Uint256: Logical left shift, generalized across limb boundaries. Every step is a plain Uint64 shift/bitwise op — already proven web-safe in Uint64 itself — so no additional safety trick is needed at this width.
operator <=(Uint256 other) → bool
operator ==(Object other) → bool: The equality operator.
override
operator >(Uint256 other) → bool
operator >=(Uint256 other) → bool
operator >>(int n) → Uint256: Logical (unsigned) right shift, generalized across limb boundaries.
operator ^(Uint256 other) → Uint256
operator unary-() → Uint256
operator |(Uint256 other) → Uint256
operator ~() → Uint256
operator ~/(Uint256 other) → Uint256

fromBytes(List<int> bytes, {Endian endian = Endian.big, int offset = 0}) → Uint256
parseDecimal(String s) → Uint256: Strict decimal parse: throws IntegerError on overflow, unlike the wrapping operators.
parseHex(String s) → Uint256