Struct CompactU256
pub struct CompactU256(pub Uint<256, 4>);
Expand description
Wrapper struct so it can use StructFlags from Compact, when used as pure table values.
Tuple Fields§
§0: Uint<256, 4>
Implementations§
§impl CompactU256
impl CompactU256
pub const fn bitflag_encoded_bytes() -> usize
pub const fn bitflag_encoded_bytes() -> usize
Used bytes by CompactU256Flags
pub const fn bitflag_unused_bits() -> usize
pub const fn bitflag_unused_bits() -> usize
Unused bits for new fields by CompactU256Flags
Methods from Deref<Target = Uint<256, 4>>§
pub fn to_base_le(&self, base: u64) -> impl Iterator<Item = u64>
pub fn to_base_le(&self, base: u64) -> impl Iterator<Item = u64>
Returns an iterator over the base base
digits of the number in
little-endian order.
Pro tip: instead of setting base = 10
, set it to the highest
power of 10
that still fits u64
. This way much fewer iterations
are required to extract all the digits.
§Panics
Panics if the base is less than 2.
pub fn to_base_be(&self, base: u64) -> impl Iterator<Item = u64>
Available on crate feature alloc
only.
pub fn to_base_be(&self, base: u64) -> impl Iterator<Item = u64>
alloc
only.Returns an iterator over the base base
digits of the number in
big-endian order.
Pro tip: instead of setting base = 10
, set it to the highest
power of 10
that still fits u64
. This way much fewer iterations
are required to extract all the digits.
§Panics
Panics if the base is less than 2.
pub fn bit(&self, index: usize) -> bool
pub fn bit(&self, index: usize) -> bool
Returns whether a specific bit is set.
Returns false
if index
exceeds the bit width of the number.
pub fn byte(&self, index: usize) -> u8
pub fn byte(&self, index: usize) -> u8
Returns a specific byte. The byte at index 0
is the least significant
byte (little endian).
§Panics
Panics if index
exceeds the byte width of the number.
§Examples
let x = uint!(0x1234567890_U64);
let bytes = [
x.byte(0), // 0x90
x.byte(1), // 0x78
x.byte(2), // 0x56
x.byte(3), // 0x34
x.byte(4), // 0x12
x.byte(5), // 0x00
x.byte(6), // 0x00
x.byte(7), // 0x00
];
assert_eq!(bytes, x.to_le_bytes());
Panics if out of range.
let x = uint!(0x1234567890_U64);
let _ = x.byte(8);
pub fn leading_zeros(&self) -> usize
pub fn leading_zeros(&self) -> usize
Returns the number of leading zeros in the binary representation of
self
.
pub fn leading_ones(&self) -> usize
pub fn leading_ones(&self) -> usize
Returns the number of leading ones in the binary representation of
self
.
pub fn trailing_zeros(&self) -> usize
pub fn trailing_zeros(&self) -> usize
Returns the number of trailing zeros in the binary representation of
self
.
pub fn trailing_ones(&self) -> usize
pub fn trailing_ones(&self) -> usize
Returns the number of trailing ones in the binary representation of
self
.
pub fn count_ones(&self) -> usize
pub fn count_ones(&self) -> usize
Returns the number of ones in the binary representation of self
.
pub fn count_zeros(&self) -> usize
pub fn count_zeros(&self) -> usize
Returns the number of zeros in the binary representation of self
.
pub fn most_significant_bits(&self) -> (u64, usize)
pub fn most_significant_bits(&self) -> (u64, usize)
Returns the most significant 64 bits of the number and the exponent.
Given return value $(\mathtt{bits}, \mathtt{exponent})$, the self
can
be approximated as
$$ \mathtt{self} ≈ \mathtt{bits} ⋅ 2^\mathtt{exponent} $$
If self
is $<≥> 2^{63}$, then exponent
will be zero and bits
will
have leading zeros.
pub const BYTES: usize = _
pub fn as_le_slice(&self) -> &[u8] ⓘ
Available on little-endian only.
pub fn as_le_slice(&self) -> &[u8] ⓘ
Access the underlying store as a little-endian slice of bytes.
Only available on little-endian targets.
If BITS
does not evenly divide 8, it is padded with zero bits in the
most significant position.
pub fn as_le_bytes(&self) -> Cow<'_, [u8]>
Available on crate feature alloc
only.
pub fn as_le_bytes(&self) -> Cow<'_, [u8]>
alloc
only.Access the underlying store as a little-endian bytes.
Uses an optimized implementation on little-endian targets.
pub fn as_le_bytes_trimmed(&self) -> Cow<'_, [u8]>
Available on crate feature alloc
only.
pub fn as_le_bytes_trimmed(&self) -> Cow<'_, [u8]>
alloc
only.Access the underlying store as a little-endian bytes with trailing zeros removed.
Uses an optimized implementation on little-endian targets.
pub fn to_le_bytes<const BYTES: usize>(&self) -> [u8; BYTES]
pub fn to_le_bytes<const BYTES: usize>(&self) -> [u8; BYTES]
pub fn to_le_bytes_vec(&self) -> Vec<u8> ⓘ
Available on crate feature alloc
only.
pub fn to_le_bytes_vec(&self) -> Vec<u8> ⓘ
alloc
only.Converts the [Uint
] to a little-endian byte vector of size exactly
[Self::BYTES
].
This method is useful when [Self::to_le_bytes
] can not be used because
byte size is not known compile time.
pub fn to_le_bytes_trimmed_vec(&self) -> Vec<u8> ⓘ
Available on crate feature alloc
only.
pub fn to_le_bytes_trimmed_vec(&self) -> Vec<u8> ⓘ
alloc
only.Converts the [Uint
] to a little-endian byte vector with trailing zeros
bytes removed.
pub fn to_be_bytes<const BYTES: usize>(&self) -> [u8; BYTES]
pub fn to_be_bytes<const BYTES: usize>(&self) -> [u8; BYTES]
pub fn to_be_bytes_vec(&self) -> Vec<u8> ⓘ
Available on crate feature alloc
only.
pub fn to_be_bytes_vec(&self) -> Vec<u8> ⓘ
alloc
only.Converts the [Uint
] to a big-endian byte vector of size exactly
[Self::BYTES
].
This method is useful when [Self::to_be_bytes
] can not be used because
byte size is not known compile time.
pub fn to_be_bytes_trimmed_vec(&self) -> Vec<u8> ⓘ
Available on crate feature alloc
only.
pub fn to_be_bytes_trimmed_vec(&self) -> Vec<u8> ⓘ
alloc
only.Converts the [Uint
] to a big-endian byte vector with leading zeros
bytes removed.
pub fn wrapping_to<T>(&self) -> Twhere
Uint<BITS, LIMBS>: UintTryTo<T>,
pub fn wrapping_to<T>(&self) -> Twhere
Uint<BITS, LIMBS>: UintTryTo<T>,
§Examples
assert_eq!(300_U12.wrapping_to::<i8>(), 44_i8);
assert_eq!(255_U32.wrapping_to::<i8>(), -1_i8);
assert_eq!(0x1337cafec0d3_U256.wrapping_to::<U32>(), 0xcafec0d3_U32);
pub fn saturating_to<T>(&self) -> Twhere
Uint<BITS, LIMBS>: UintTryTo<T>,
pub fn saturating_to<T>(&self) -> Twhere
Uint<BITS, LIMBS>: UintTryTo<T>,
§Examples
assert_eq!(300_U12.saturating_to::<i16>(), 300_i16);
assert_eq!(255_U32.saturating_to::<i8>(), 127);
assert_eq!(0x1337cafec0d3_U256.saturating_to::<U32>(), U32::MAX);
pub const LIMBS: usize = _
pub const MASK: u64 = _
pub const BITS: usize = BITS
pub const ZERO: Uint<BITS, LIMBS> = _
pub const MIN: Uint<BITS, LIMBS> = Self::ZERO
pub const MAX: Uint<BITS, LIMBS> = _
Trait Implementations§
§impl<'arbitrary> Arbitrary<'arbitrary> for CompactU256
impl<'arbitrary> Arbitrary<'arbitrary> for CompactU256
§fn arbitrary(u: &mut Unstructured<'arbitrary>) -> Result<CompactU256, Error>
fn arbitrary(u: &mut Unstructured<'arbitrary>) -> Result<CompactU256, Error>
Self
from the given unstructured data. Read more§fn arbitrary_take_rest(
u: Unstructured<'arbitrary>,
) -> Result<CompactU256, Error>
fn arbitrary_take_rest( u: Unstructured<'arbitrary>, ) -> Result<CompactU256, Error>
Self
from the entirety of the given
unstructured data. Read more§impl Clone for CompactU256
impl Clone for CompactU256
§fn clone(&self) -> CompactU256
fn clone(&self) -> CompactU256
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read more§impl Compact for CompactU256
impl Compact for CompactU256
§fn to_compact<B>(&self, buf: &mut B) -> usize
fn to_compact<B>(&self, buf: &mut B) -> usize
§fn from_compact(buf: &[u8], len: usize) -> (CompactU256, &[u8])
fn from_compact(buf: &[u8], len: usize) -> (CompactU256, &[u8])
buf
with its internal cursor
advanced (eg..advance(len)
). Read more§fn specialized_to_compact<B>(&self, buf: &mut B) -> usize
fn specialized_to_compact<B>(&self, buf: &mut B) -> usize
§fn specialized_from_compact(buf: &[u8], len: usize) -> (Self, &[u8])
fn specialized_from_compact(buf: &[u8], len: usize) -> (Self, &[u8])
§impl Compress for CompactU256
impl Compress for CompactU256
§type Compressed = Vec<u8>
type Compressed = Vec<u8>
§fn compress_to_buf<B>(self, buf: &mut B)
fn compress_to_buf<B>(self, buf: &mut B)
§fn uncompressable_ref(&self) -> Option<&[u8]>
fn uncompressable_ref(&self) -> Option<&[u8]>
Some(self.as_ref())
§fn compress(self) -> Self::Compressed
fn compress(self) -> Self::Compressed
§impl Debug for CompactU256
impl Debug for CompactU256
§impl Decompress for CompactU256
impl Decompress for CompactU256
§fn decompress(value: &[u8]) -> Result<CompactU256, DatabaseError>
fn decompress(value: &[u8]) -> Result<CompactU256, DatabaseError>
§fn decompress_owned(value: Vec<u8>) -> Result<Self, DatabaseError>
fn decompress_owned(value: Vec<u8>) -> Result<Self, DatabaseError>
§impl Default for CompactU256
impl Default for CompactU256
§fn default() -> CompactU256
fn default() -> CompactU256
§impl Deref for CompactU256
impl Deref for CompactU256
§impl<'de> Deserialize<'de> for CompactU256
impl<'de> Deserialize<'de> for CompactU256
§fn deserialize<__D>(
__deserializer: __D,
) -> Result<CompactU256, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(
__deserializer: __D,
) -> Result<CompactU256, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
§impl From<CompactU256> for Uint<256, 4>
impl From<CompactU256> for Uint<256, 4>
§fn from(value: CompactU256) -> Uint<256, 4>
fn from(value: CompactU256) -> Uint<256, 4>
§impl From<Uint<256, 4>> for CompactU256
impl From<Uint<256, 4>> for CompactU256
§fn from(value: Uint<256, 4>) -> CompactU256
fn from(value: Uint<256, 4>) -> CompactU256
§impl PartialEq for CompactU256
impl PartialEq for CompactU256
§impl Serialize for CompactU256
impl Serialize for CompactU256
§fn serialize<__S>(
&self,
__serializer: __S,
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
fn serialize<__S>(
&self,
__serializer: __S,
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
impl Eq for CompactU256
impl StructuralPartialEq for CompactU256
Auto Trait Implementations§
impl Freeze for CompactU256
impl RefUnwindSafe for CompactU256
impl Send for CompactU256
impl Sync for CompactU256
impl Unpin for CompactU256
impl UnwindSafe for CompactU256
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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 32 bytes