Trait LowerHex 

pub trait LowerHex {
    // Required method
    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}

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

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 bf16

Available on non-target_arch=spirv only.

impl LowerHex for Flags

impl LowerHex for Functionality

impl LowerHex for I2CMessageFlags

impl LowerHex for AtFlags

impl LowerHex for FallocateFlags

impl LowerHex for nix::fcntl::FdFlag

impl LowerHex for OFlag

impl LowerHex for RenameFlags

impl LowerHex for SealFlag

impl LowerHex for SpliceFFlags

impl LowerHex for DeleteModuleFlags

impl LowerHex for ModuleInitFlags

impl LowerHex for MntFlags

impl LowerHex for nix::mount::linux::MsFlags

impl LowerHex for nix::mqueue::FdFlag

impl LowerHex for MQ_OFlag

impl LowerHex for InterfaceFlags

impl LowerHex for PollFlags

impl LowerHex for CloneFlags

impl LowerHex for EpollCreateFlags

impl LowerHex for EpollFlags

impl LowerHex for EfdFlags

impl LowerHex for AddWatchFlags

impl LowerHex for InitFlags

impl LowerHex for MemFdCreateFlag

impl LowerHex for MRemapFlags

impl LowerHex for MapFlags

impl LowerHex for MlockAllFlags

impl LowerHex for nix::sys::mman::MsFlags

impl LowerHex for ProtFlags

impl LowerHex for Persona

impl LowerHex for Options

impl LowerHex for QuotaValidFlags

impl LowerHex for SaFlags

impl LowerHex for SfdFlags

impl LowerHex for MsgFlags

impl LowerHex for SockFlag

impl LowerHex for Mode

impl LowerHex for SFlag

impl LowerHex for FsFlags

impl LowerHex for ControlFlags

impl LowerHex for InputFlags

impl LowerHex for LocalFlags

impl LowerHex for OutputFlags

impl LowerHex for TimerFlags

impl LowerHex for TimerSetTimeFlags

impl LowerHex for WaitPidFlag

impl LowerHex for AccessFlags

impl LowerHex for BigInt

impl LowerHex for BigUint

impl LowerHex for m128

impl LowerHex for m128d

impl LowerHex for m128i

impl LowerHex for m256

impl LowerHex for m256d

impl LowerHex for m256i

impl LowerHex for f32x4

impl LowerHex for f32x8

impl LowerHex for f64x2

impl LowerHex for f64x4

impl LowerHex for i8x16

impl LowerHex for i8x32

impl LowerHex for i16x8

impl LowerHex for i16x16

impl LowerHex for i32x4

impl LowerHex for i32x8

impl LowerHex for i64x2

impl LowerHex for i64x4

impl LowerHex for u8x16

impl LowerHex for u8x32

impl LowerHex for u16x8

impl LowerHex for u16x16

impl LowerHex for u32x4

impl LowerHex for u32x8

impl LowerHex for u64x2

impl LowerHex for u64x4

impl LowerHex for PollEvents

impl LowerHex for f16

Available on non-target_arch=spirv only.

impl LowerHex for Bytes

impl<'a, T> LowerHex for StyledValue<'a, T>

where T: LowerHex,

impl<D> LowerHex for StyledObject<D>

where D: LowerHex,

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<T> LowerHex for &T

where T: LowerHex + ?Sized,

impl<T> LowerHex for &mut T

where T: LowerHex + ?Sized,

impl<T> LowerHex for num_complex::Complex<T>

where T: LowerHex + Num + PartialOrd + Clone,

impl<T> LowerHex for num_complex::Complex<T>

where T: LowerHex + Num + PartialOrd + Clone,

impl<T> LowerHex for Ratio<T>

where T: LowerHex + Clone + Integer,

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, R, C, S> LowerHex for Matrix<T, R, C, S>

where R: Dim, C: Dim, T: Scalar + LowerHex, S: RawStorage<T, R, C>,