Trait UpperHex 

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

X formatting.

The UpperHex trait should format its output as a number in hexadecimal, with A through F in upper 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 UpperHex on a type:

use std::fmt;

struct Length(i32);

impl fmt::UpperHex for Length {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let val = self.0;

        fmt::UpperHex::fmt(&val, f) // delegate to i32's implementation
    }
}

let l = Length(i32::MAX);

assert_eq!(format!("l as hex is: {l:X}"), "l as hex is: 7FFFFFFF");

assert_eq!(format!("l as hex is: {l:#010X}"), "l as hex is: 0x7FFFFFFF");

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 UpperHex for i8

impl UpperHex for i16

impl UpperHex for i32

impl UpperHex for i64

impl UpperHex for i128

impl UpperHex for isize

impl UpperHex for u8

impl UpperHex for u16

impl UpperHex for u32

impl UpperHex for u64

impl UpperHex for u128

impl UpperHex for usize

impl UpperHex for bf16

Available on non-target_arch=spirv only.

impl UpperHex for Flags

impl UpperHex for Functionality

impl UpperHex for I2CMessageFlags

impl UpperHex for AtFlags

impl UpperHex for FallocateFlags

impl UpperHex for nix::fcntl::FdFlag

impl UpperHex for OFlag

impl UpperHex for RenameFlags

impl UpperHex for SealFlag

impl UpperHex for SpliceFFlags

impl UpperHex for DeleteModuleFlags

impl UpperHex for ModuleInitFlags

impl UpperHex for MntFlags

impl UpperHex for nix::mount::linux::MsFlags

impl UpperHex for nix::mqueue::FdFlag

impl UpperHex for MQ_OFlag

impl UpperHex for InterfaceFlags

impl UpperHex for PollFlags

impl UpperHex for CloneFlags

impl UpperHex for EpollCreateFlags

impl UpperHex for EpollFlags

impl UpperHex for EfdFlags

impl UpperHex for AddWatchFlags

impl UpperHex for InitFlags

impl UpperHex for MemFdCreateFlag

impl UpperHex for MRemapFlags

impl UpperHex for MapFlags

impl UpperHex for MlockAllFlags

impl UpperHex for nix::sys::mman::MsFlags

impl UpperHex for ProtFlags

impl UpperHex for Persona

impl UpperHex for Options

impl UpperHex for QuotaValidFlags

impl UpperHex for SaFlags

impl UpperHex for SfdFlags

impl UpperHex for MsgFlags

impl UpperHex for SockFlag

impl UpperHex for Mode

impl UpperHex for SFlag

impl UpperHex for FsFlags

impl UpperHex for ControlFlags

impl UpperHex for InputFlags

impl UpperHex for LocalFlags

impl UpperHex for OutputFlags

impl UpperHex for TimerFlags

impl UpperHex for TimerSetTimeFlags

impl UpperHex for WaitPidFlag

impl UpperHex for AccessFlags

impl UpperHex for BigInt

impl UpperHex for BigUint

impl UpperHex for m128

impl UpperHex for m128d

impl UpperHex for m128i

impl UpperHex for m256

impl UpperHex for m256d

impl UpperHex for m256i

impl UpperHex for f32x4

impl UpperHex for f32x8

impl UpperHex for f64x2

impl UpperHex for f64x4

impl UpperHex for i8x16

impl UpperHex for i8x32

impl UpperHex for i16x8

impl UpperHex for i16x16

impl UpperHex for i32x4

impl UpperHex for i32x8

impl UpperHex for i64x2

impl UpperHex for i64x4

impl UpperHex for u8x16

impl UpperHex for u8x32

impl UpperHex for u16x8

impl UpperHex for u16x16

impl UpperHex for u32x4

impl UpperHex for u32x8

impl UpperHex for u64x2

impl UpperHex for u64x4

impl UpperHex for PollEvents

impl UpperHex for f16

Available on non-target_arch=spirv only.

impl UpperHex for Bytes

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

where T: UpperHex,

impl<D> UpperHex for StyledObject<D>

where D: UpperHex,

impl<O> UpperHex for I16<O>

where O: ByteOrder,

impl<O> UpperHex for I32<O>

where O: ByteOrder,

impl<O> UpperHex for I64<O>

where O: ByteOrder,

impl<O> UpperHex for I128<O>

where O: ByteOrder,

impl<O> UpperHex for Isize<O>

where O: ByteOrder,

impl<O> UpperHex for U16<O>

where O: ByteOrder,

impl<O> UpperHex for U32<O>

where O: ByteOrder,

impl<O> UpperHex for U64<O>

where O: ByteOrder,

impl<O> UpperHex for U128<O>

where O: ByteOrder,

impl<O> UpperHex for Usize<O>

where O: ByteOrder,

impl<T> UpperHex for &T

where T: UpperHex + ?Sized,

impl<T> UpperHex for &mut T

where T: UpperHex + ?Sized,

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

where T: UpperHex + Num + PartialOrd + Clone,

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

where T: UpperHex + Num + PartialOrd + Clone,

impl<T> UpperHex for Ratio<T>

where T: UpperHex + Clone + Integer,

impl<T> UpperHex for NonZero<T>

where T: ZeroablePrimitive + UpperHex,

impl<T> UpperHex for Saturating<T>

where T: UpperHex,

impl<T> UpperHex for Wrapping<T>

where T: UpperHex,

impl<T, R, C, S> UpperHex for Matrix<T, R, C, S>

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