pub trait LowerHex {
// Required method
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}Expand description
x formatting.
The LowerHex trait should format its output as a number in hexadecimal, with a through f
in lower case.
For primitive signed integers (i8 to i128, and isize),
negative values are formatted as the two’s complement representation.
The alternate flag, #, adds a 0x in front of the output.
For more information on formatters, see the module-level documentation.
§Examples
Basic usage with i32:
let y = 42; // 42 is '2a' in hex
assert_eq!(format!("{y:x}"), "2a");
assert_eq!(format!("{y:#x}"), "0x2a");
assert_eq!(format!("{:x}", -16), "fffffff0");Implementing LowerHex on a type:
use std::fmt;
struct Length(i32);
impl fmt::LowerHex for Length {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let val = self.0;
fmt::LowerHex::fmt(&val, f) // delegate to i32's implementation
}
}
let l = Length(9);
assert_eq!(format!("l as hex is: {l:x}"), "l as hex is: 9");
assert_eq!(format!("l as hex is: {l:#010x}"), "l as hex is: 0x00000009");Required Methods§
1.0.0 · Sourcefn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Formats the value using the given formatter.
§Errors
This function should return Err if, and only if, the provided Formatter returns Err.
String formatting is considered an infallible operation; this function only
returns a Result because writing to the underlying stream might fail and it must
provide a way to propagate the fact that an error has occurred back up the stack.
Implementors§
impl LowerHex for i8
impl LowerHex for i16
impl LowerHex for i32
impl LowerHex for i64
impl LowerHex for i128
impl LowerHex for isize
impl LowerHex for u8
impl LowerHex for u16
impl LowerHex for u32
impl LowerHex for u64
impl LowerHex for u128
impl LowerHex for usize
impl LowerHex for RelayFlags
impl LowerHex for HsId
impl LowerHex for BigInt
impl LowerHex for BigUint
impl LowerHex for CipherCtxFlags
impl LowerHex for CMSOptions
impl LowerHex for OcspFlag
impl LowerHex for Pkcs7Flags
impl LowerHex for ExtensionContext
impl LowerHex for ShutdownState
impl LowerHex for SslMode
impl LowerHex for SslOptions
impl LowerHex for SslSessionCacheMode
impl LowerHex for SslVerifyMode
impl LowerHex for X509CheckFlags
impl LowerHex for X509VerifyFlags
impl LowerHex for Access
impl LowerHex for AtFlags
impl LowerHex for BeginFlags
impl LowerHex for Bytes
impl LowerHex for Bytes
impl LowerHex for BytesMut
impl LowerHex for CreateFlags
impl LowerHex for CreateFlags
impl LowerHex for DupFlags
impl LowerHex for EcdsaPublicKey
impl LowerHex for Ed25519PrivateKey
impl LowerHex for Ed25519PublicKey
impl LowerHex for EventFlags
impl LowerHex for EventMask
impl LowerHex for EventfdFlags
impl LowerHex for FallocateFlags
impl LowerHex for FdFlags
impl LowerHex for FloatingPointEmulationControl
impl LowerHex for FloatingPointExceptionMode
impl LowerHex for HexDisplay<'_>
impl LowerHex for IFlags
impl LowerHex for MembarrierQuery
impl LowerHex for MemfdFlags
impl LowerHex for Mode
impl LowerHex for MountFlags
impl LowerHex for MountPropagationFlags
impl LowerHex for Mpint
impl LowerHex for OFlags
impl LowerHex for PidfdFlags
impl LowerHex for PidfdGetfdFlags
impl LowerHex for PipeFlags
impl LowerHex for PollFlags
impl LowerHex for ReadFlags
impl LowerHex for ReadWriteFlags
impl LowerHex for RecvFlags
impl LowerHex for RenameFlags
impl LowerHex for ResolveFlags
impl LowerHex for SealFlags
impl LowerHex for SendFlags
impl LowerHex for Signature
impl LowerHex for Signature
impl LowerHex for Signature
impl LowerHex for Signature
impl LowerHex for SockaddrXdpFlags
impl LowerHex for SocketFlags
impl LowerHex for SpeculationFeatureControl
impl LowerHex for SpeculationFeatureState
impl LowerHex for SpliceFlags
impl LowerHex for StatVfsMountFlags
impl LowerHex for StatxFlags
impl LowerHex for TimerfdFlags
impl LowerHex for TimerfdTimerFlags
impl LowerHex for UnalignedAccessControl
impl LowerHex for UnmountFlags
impl LowerHex for WaitOptions
impl LowerHex for WaitidOptions
impl LowerHex for WatchFlags
impl LowerHex for WatchMask
impl LowerHex for XattrFlags
impl LowerHex for XdpDescOptions
impl LowerHex for XdpOptionsFlags
impl LowerHex for XdpRingFlags
impl LowerHex for XdpUmemRegFlags
impl LowerHex for u1
impl LowerHex for u2
impl LowerHex for u3
impl LowerHex for u4
impl LowerHex for u5
impl LowerHex for u6
impl LowerHex for u7
impl LowerHex for u24
impl LowerHex for u40
impl LowerHex for u48
impl LowerHex for u56
impl<'a, I> LowerHex for Format<'a, I>
impl<'a, T, O> LowerHex for Domain<'a, Const, T, O>where
O: BitOrder,
T: BitStore,
impl<A, O> LowerHex for BitArray<A, O>where
O: BitOrder,
A: BitViewSized,
impl<O> LowerHex for I16<O>where
O: ByteOrder,
impl<O> LowerHex for I32<O>where
O: ByteOrder,
impl<O> LowerHex for I64<O>where
O: ByteOrder,
impl<O> LowerHex for I128<O>where
O: ByteOrder,
impl<O> LowerHex for Isize<O>where
O: ByteOrder,
impl<O> LowerHex for U16<O>where
O: ByteOrder,
impl<O> LowerHex for U32<O>where
O: ByteOrder,
impl<O> LowerHex for U64<O>where
O: ByteOrder,
impl<O> LowerHex for U128<O>where
O: ByteOrder,
impl<O> LowerHex for Usize<O>where
O: ByteOrder,
impl<Size> LowerHex for EncodedPoint<Size>where
Size: ModulusSize,
impl<T> LowerHex for &T
impl<T> LowerHex for &mut T
impl<T> LowerHex for NonZero<T>where
T: ZeroablePrimitive + LowerHex,
impl<T> LowerHex for Saturating<T>where
T: LowerHex,
impl<T> LowerHex for Wrapping<T>where
T: LowerHex,
impl<T> LowerHex for BoxSensitive<T>where
T: LowerHex,
impl<T> LowerHex for FmtBinary<T>
impl<T> LowerHex for FmtDisplay<T>
impl<T> LowerHex for FmtList<T>
impl<T> LowerHex for FmtLowerExp<T>
impl<T> LowerHex for FmtLowerHex<T>where
T: LowerHex,
impl<T> LowerHex for FmtOctal<T>
impl<T> LowerHex for FmtPointer<T>
impl<T> LowerHex for FmtUpperExp<T>
impl<T> LowerHex for FmtUpperHex<T>
impl<T> LowerHex for GenericArray<u8, T>
impl<T> LowerHex for Sensitive<T>where
T: LowerHex,
impl<T, O> LowerHex for BitBox<T, O>where
O: BitOrder,
T: BitStore,
impl<T, O> LowerHex for BitSlice<T, O>where
T: BitStore,
O: BitOrder,
§Bit-Slice Rendering
This implementation prints the contents of a &BitSlice in one of binary,
octal, or hexadecimal. It is important to note that this does not render the
raw underlying memory! They render the semantically-ordered contents of the
bit-slice as numerals. This distinction matters if you use type parameters that
differ from those presumed by your debugger (which is usually <u8, Msb0>).
The output separates the T elements as individual list items, and renders each
element as a base- 2, 8, or 16 numeric string. When walking an element, the bits
traversed by the bit-slice are considered to be stored in
most-significant-bit-first ordering. This means that index [0] is the high bit
of the left-most digit, and index [n] is the low bit of the right-most digit,
in a given printed word.
In order to render according to expectations of the Arabic numeral system, an
element being transcribed is chunked into digits from the least-significant end
of its rendered form. This is most noticeable in octal, which will always have a
smaller ceiling on the left-most digit in a printed word, while the right-most
digit in that word is able to use the full 0 ..= 7 numeral range.
§Examples
use bitvec::prelude::*;
let data = [
0b000000_10u8,
// digits print LTR
0b10_001_101,
// significance is computed RTL
0b01_000000,
];
let bits = &data.view_bits::<Msb0>()[6 .. 18];
assert_eq!(format!("{:b}", bits), "[10, 10001101, 01]");
assert_eq!(format!("{:o}", bits), "[2, 215, 1]");
assert_eq!(format!("{:X}", bits), "[2, 8D, 1]");The {:#} format modifier causes the standard 0b, 0o, or 0x prefix to be
applied to each printed word. The other format specifiers are not interpreted by
this implementation, and apply to the entire rendered text, not to individual
words.