Trait LowerHex

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

core x formatting.

Re-exported from core::fmt:: .

---

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 KeyEventState

impl LowerHex for KeyModifiers

impl LowerHex for KeyboardEnhancementFlags

impl LowerHex for FileAccess

impl LowerHex for Root

impl LowerHex for FileChooserType

impl LowerHex for FileDialogOptions

impl LowerHex for LineStyle

impl LowerHex for Align

impl LowerHex for CallbackTrigger

impl LowerHex for Damage

impl LowerHex for devela::_dep::fltk::enums::Mode

impl LowerHex for Shortcut

impl LowerHex for GridAlign

impl LowerHex for AnimGifImageFlags

impl LowerHex for MenuFlag

impl LowerHex for Attrib

impl LowerHex for CharFlags

impl LowerHex for OutFlags

impl LowerHex for BigInt

impl LowerHex for devela::_dep::rustix::event::epoll::CreateFlags

impl LowerHex for EventfdFlags

impl LowerHex for PollFlags

impl LowerHex for devela::_dep::rustix::fs::inotify::CreateFlags

impl LowerHex for ReadFlags

impl LowerHex for WatchFlags

impl LowerHex for Access

impl LowerHex for AtFlags

impl LowerHex for FallocateFlags

impl LowerHex for FdFlags

impl LowerHex for IFlags

impl LowerHex for MemfdFlags

impl LowerHex for devela::_dep::rustix::fs::Mode

impl LowerHex for MountFlags

impl LowerHex for MountPropagationFlags

impl LowerHex for OFlags

impl LowerHex for RenameFlags

impl LowerHex for ResolveFlags

impl LowerHex for SealFlags

impl LowerHex for StatVfsMountFlags

impl LowerHex for StatxFlags

impl LowerHex for UnmountFlags

impl LowerHex for XattrFlags

impl LowerHex for DupFlags

impl LowerHex for ReadWriteFlags

impl LowerHex for EventFlags

impl LowerHex for IoringAcceptFlags

impl LowerHex for IoringAsyncCancelFlags

impl LowerHex for IoringCqFlags

impl LowerHex for IoringCqeFlags

impl LowerHex for IoringEnterFlags

impl LowerHex for IoringFeatureFlags

impl LowerHex for IoringFsyncFlags

impl LowerHex for IoringMsgringFlags

impl LowerHex for IoringOpFlags

impl LowerHex for IoringPollFlags

impl LowerHex for IoringRecvFlags

impl LowerHex for IoringRegisterFlags

impl LowerHex for IoringRsrcFlags

impl LowerHex for IoringSendFlags

impl LowerHex for IoringSetupFlags

impl LowerHex for IoringSqFlags

impl LowerHex for IoringSqeFlags

impl LowerHex for IoringTimeoutFlags

impl LowerHex for RecvFlags

impl LowerHex for RecvmsgOutFlags

impl LowerHex for SendFlags

impl LowerHex for SocketFlags

impl LowerHex for devela::_dep::rustix::io_uring::SpliceFlags

impl LowerHex for MapFlags

impl LowerHex for MlockAllFlags

impl LowerHex for MlockFlags

impl LowerHex for MprotectFlags

impl LowerHex for MremapFlags

impl LowerHex for MsyncFlags

impl LowerHex for ProtFlags

impl LowerHex for UserfaultfdFlags

impl LowerHex for FsMountFlags

impl LowerHex for FsOpenFlags

impl LowerHex for FsPickFlags

impl LowerHex for MountAttrFlags

impl LowerHex for MoveMountFlags

impl LowerHex for OpenTreeFlags

impl LowerHex for SockaddrXdpFlags

impl LowerHex for XdpDescOptions

impl LowerHex for XdpOptionsFlags

impl LowerHex for XdpRingFlags

impl LowerHex for XdpUmemRegFlags

impl LowerHex for PipeFlags

impl LowerHex for devela::_dep::rustix::pipe::SpliceFlags

impl LowerHex for FloatingPointEmulationControl

impl LowerHex for FloatingPointExceptionMode

impl LowerHex for MembarrierQuery

impl LowerHex for PidfdFlags

impl LowerHex for PidfdGetfdFlags

impl LowerHex for SpeculationFeatureControl

impl LowerHex for SpeculationFeatureState

impl LowerHex for UnalignedAccessControl

impl LowerHex for WaitOptions

impl LowerHex for WaitidOptions

impl LowerHex for OpenptFlags

impl LowerHex for GetRandomFlags

impl LowerHex for ShmOFlags

impl LowerHex for ControlModes

impl LowerHex for InputModes

impl LowerHex for LocalModes

impl LowerHex for OutputModes

impl LowerHex for CapabilitiesSecureBits

impl LowerHex for CapabilityFlags

impl LowerHex for devela::_dep::rustix::thread::FutexFlags

impl LowerHex for TaggedAddressMode

impl LowerHex for ThreadNameSpaceType

impl LowerHex for UnshareFlags

impl LowerHex for TimerfdFlags

impl LowerHex for TimerfdTimerFlags

impl LowerHex for devela::_dep::sdl2::image::InitFlag

impl LowerHex for devela::_dep::sdl2::keyboard::Mod

impl LowerHex for devela::_dep::sdl2::messagebox::MessageBoxButtonFlag

impl LowerHex for devela::_dep::sdl2::messagebox::MessageBoxFlag

impl LowerHex for devela::_dep::sdl2::mixer::InitFlag

impl LowerHex for FontStyle

impl LowerHex for GlobFlags

impl LowerHex for devela::_dep::sdl3::keyboard::Mod

impl LowerHex for devela::_dep::sdl3::messagebox::MessageBoxButtonFlag

impl LowerHex for devela::_dep::sdl3::messagebox::MessageBoxFlag

impl LowerHex for Channels

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 u16x8

impl LowerHex for u16x16

impl LowerHex for u32x4

impl LowerHex for u32x8

impl LowerHex for u64x2

impl LowerHex for u64x4

impl LowerHex for devela::_dep::winnow::Bytes

impl LowerHex for ExampleBitfield

Available on crate feature _bit_u8 and (doc or test) only.

impl LowerHex for ExampleBitfieldCustom

Available on crate feature _bit_u8 and (doc or test) only.

impl LowerHex for ExampleBitfieldExtra

Available on crate feature _bit_u8 and (doc or test) only.

impl LowerHex for ExampleEnumSet

Available on doc or test only.

impl LowerHex for char7

impl LowerHex for char8

impl LowerHex for char16

impl LowerHex for Braced

impl LowerHex for Hyphenated

impl LowerHex for Simple

impl LowerHex for Urn

impl LowerHex for Uuid

impl LowerHex for DrumFrame8

Available on crate feature audio only.

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 Bytes

impl LowerHex for BytesMut

impl LowerHex for EfdFlags

impl LowerHex for EpollCreateFlags

impl LowerHex for EpollFlags

impl LowerHex for EventMask

impl LowerHex for Flags

impl LowerHex for PortCap

impl LowerHex for PortType

impl LowerHex for Remove

impl LowerHex for Transformations

impl LowerHex for WatchMask

impl<'a, I> LowerHex for Format<'a, I>

where I: Iterator, <I as Iterator>::Item: LowerHex,

impl<'t, T, F, U> LowerHex for OptionFmtOrElse<'t, T, F>

where T: LowerHex, F: Fn() -> U, U: Display,

impl<'t, T, U> LowerHex for OptionFmtOr<'t, T, U>

where T: LowerHex, U: Display,

impl<BUF: DstBuf, DST> LowerHex for DstValue<DST, BUF>

where DST: LowerHex + ?Sized,

Available on crate feature unsafe_layout only.

impl<T> LowerHex for &T

where T: LowerHex + ?Sized,

impl<T> LowerHex for &mut T

where T: LowerHex + ?Sized,

impl<T> LowerHex for NonZero<T>

where T: ZeroablePrimitive + LowerHex,

impl<T> LowerHex for OptionFmt<'_, T>

where T: LowerHex,

impl<T> LowerHex for Saturating<T>

where T: LowerHex,

impl<T> LowerHex for Wrapping<T>

where T: LowerHex,

impl<T: LowerHex> LowerHex for Frac<T>

impl<T: LowerHex> LowerHex for Int<T>

impl<T: LowerHex> LowerHex for Bitwise<T>

impl<const V: i8> LowerHex for devela::_info::examples::niche::NonValueI8<V>

Available on doc or test only.

impl<const V: i8> LowerHex for devela::all::NonValueI8<V>

impl<const V: u8> LowerHex for NonValueU8<V>

impl<const V: u16> LowerHex for NonValueU16<V>