pub struct NumberWithBase {
number: U256,
is_nonnegative: bool,
base: Base,
}
Expand description
Utility struct for parsing numbers and formatting them into different bases.
§Example
use cast::base::NumberWithBase;
use alloy_primitives::U256;
let number: NumberWithBase = U256::from(12345).into();
assert_eq!(number.format(), "12345");
// Debug uses number.base() to determine which base to format to, which defaults to Base::Decimal
assert_eq!(format!("{:?}", number), "12345");
// Display uses Base::Decimal
assert_eq!(format!("{}", number), "12345");
// The alternate formatter ("#") prepends the base's prefix
assert_eq!(format!("{:x}", number), "3039");
assert_eq!(format!("{:#x}", number), "0x3039");
assert_eq!(format!("{:b}", number), "11000000111001");
assert_eq!(format!("{:#b}", number), "0b11000000111001");
assert_eq!(format!("{:o}", number), "30071");
assert_eq!(format!("{:#o}", number), "0o30071");
Fields§
§number: U256
The number.
is_nonnegative: bool
Whether the number is positive or zero.
base: Base
The base to format to.
Implementations§
Source§impl NumberWithBase
impl NumberWithBase
pub fn new(number: impl Into<U256>, is_nonnegative: bool, base: Base) -> Self
Sourcepub fn with_base(&self, base: Base) -> Self
pub fn with_base(&self, base: Base) -> Self
Creates a copy of the number with the provided base.
Sourcepub fn parse_int(s: &str, base: Option<&str>) -> Result<Self>
pub fn parse_int(s: &str, base: Option<&str>) -> Result<Self>
Parses a string slice into a signed integer. If base is None then it tries to determine base from the prefix, otherwise defaults to Decimal.
Sourcepub fn parse_uint(s: &str, base: Option<&str>) -> Result<Self>
pub fn parse_uint(s: &str, base: Option<&str>) -> Result<Self>
Parses a string slice into an unsigned integer. If base is None then it tries to determine base from the prefix, otherwise defaults to Decimal.
Sourcepub fn number(&self) -> U256
pub fn number(&self) -> U256
Returns a copy of the underlying number as an unsigned integer. If the value is negative then the two’s complement of its absolute value will be returned.
Sourcepub fn is_nonnegative(&self) -> bool
pub fn is_nonnegative(&self) -> bool
Returns whether the underlying number is positive or zero.
Sourcepub fn format(&self) -> String
pub fn format(&self) -> String
Formats the number into the specified base.
Note: this method only formats the number into the base, without adding any prefixes, signs or padding. Refer to the std::fmt module documentation on how to format this number with the aforementioned properties.
fn _parse_int(s: &str, base: Base) -> Result<(U256, bool)>
fn _parse_uint(s: &str, base: Base) -> Result<U256>
Methods from Deref<Target = U256>§
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]
Converts the Uint
to a little-endian byte array of size exactly
Self::BYTES
.
§Panics
Panics if the generic parameter BYTES
is not exactly Self::BYTES
.
Ideally this would be a compile time error, but this is blocked by
Rust issue #60551.
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]
Converts the Uint
to a big-endian byte array of size exactly
Self::BYTES
.
§Panics
Panics if the generic parameter BYTES
is not exactly Self::BYTES
.
Ideally this would be a compile time error, but this is blocked by
Rust issue #60551.
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 to<T>(&self) -> T
pub fn to<T>(&self) -> T
pub fn wrapping_to<T>(&self) -> T
pub fn wrapping_to<T>(&self) -> 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) -> T
pub fn saturating_to<T>(&self) -> 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§
Source§impl Binary for NumberWithBase
impl Binary for NumberWithBase
Source§impl Clone for NumberWithBase
impl Clone for NumberWithBase
Source§fn clone(&self) -> NumberWithBase
fn clone(&self) -> NumberWithBase
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for NumberWithBase
impl Debug for NumberWithBase
Source§impl Deref for NumberWithBase
impl Deref for NumberWithBase
Source§impl Display for NumberWithBase
impl Display for NumberWithBase
Source§impl From<NumberWithBase> for I256
impl From<NumberWithBase> for I256
Source§fn from(n: NumberWithBase) -> Self
fn from(n: NumberWithBase) -> Self
Source§impl From<NumberWithBase> for String
impl From<NumberWithBase> for String
Source§fn from(n: NumberWithBase) -> Self
fn from(n: NumberWithBase) -> Self
Formats the number into the specified base. See NumberWithBase::format.
Source§impl From<NumberWithBase> for U256
impl From<NumberWithBase> for U256
Source§fn from(n: NumberWithBase) -> Self
fn from(n: NumberWithBase) -> Self
Source§impl From<ParseUnits> for NumberWithBase
impl From<ParseUnits> for NumberWithBase
Source§fn from(value: ParseUnits) -> Self
fn from(value: ParseUnits) -> Self
Source§impl From<Signed<256, 4>> for NumberWithBase
impl From<Signed<256, 4>> for NumberWithBase
Source§impl From<Uint<256, 4>> for NumberWithBase
impl From<Uint<256, 4>> for NumberWithBase
Source§impl FromStr for NumberWithBase
impl FromStr for NumberWithBase
Source§impl LowerHex for NumberWithBase
impl LowerHex for NumberWithBase
Source§impl Octal for NumberWithBase
impl Octal for NumberWithBase
Source§impl ToBase for NumberWithBase
impl ToBase for NumberWithBase
Source§impl UpperHex for NumberWithBase
impl UpperHex for NumberWithBase
impl Copy for NumberWithBase
Auto Trait Implementations§
impl Freeze for NumberWithBase
impl RefUnwindSafe for NumberWithBase
impl Send for NumberWithBase
impl Sync for NumberWithBase
impl Unpin for NumberWithBase
impl UnwindSafe for NumberWithBase
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.tap_mut()
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builds.§fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
.tap_borrow()
only in debug builds, and is erased in release
builds.§fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
.tap_borrow_mut()
only in debug builds, and is erased in release
builds.§fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
.tap_ref()
only in debug builds, and is erased in release
builds.§fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
.tap_ref_mut()
only in debug builds, and is erased in release
builds.§fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
.tap_deref()
only in debug builds, and is erased in release
builds.§impl<T> TryConv for T
impl<T> TryConv for T
§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> ⓘwhere
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> ⓘwhere
S: Into<Dispatch>,
§fn with_current_subscriber(self) -> WithDispatch<Self> ⓘ
fn with_current_subscriber(self) -> WithDispatch<Self> ⓘ
Layout§
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: 40 bytes