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 DrawFlags

impl LowerHex for DrawListFlags

impl LowerHex for BackendFlags

impl LowerHex for ButtonFlags

impl LowerHex for ColorEditFlags

impl LowerHex for ComboBoxFlags

impl LowerHex for ConfigFlags

impl LowerHex for DragDropFlags

impl LowerHex for FontAtlasFlags

impl LowerHex for InputTextCallback

impl LowerHex for InputTextFlags

impl LowerHex for InputTextMultilineCallback

impl LowerHex for ItemHoveredFlags

impl LowerHex for JoystickHats

impl LowerHex for Modifiers

impl LowerHex for SelectableFlags

impl LowerHex for SliderFlags

impl LowerHex for TabBarFlags

impl LowerHex for TabItemFlags

impl LowerHex for TreeNodeFlags

impl LowerHex for WindowFlags

impl LowerHex for WindowFocusedFlags

impl LowerHex for WindowHoveredFlags

impl LowerHex for bf16

Available on non-target_arch=spirv only.

impl LowerHex for f16

Available on non-target_arch=spirv only.

impl LowerHex for BigInt

impl LowerHex for BigUint

impl LowerHex for Transformations

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

where I: Iterator, <I as Iterator>::Item: 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 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 Ratio<T>

where T: LowerHex + Clone + Integer,

impl<T> LowerHex for Bgr<T>

where T: LowerHex,

impl<T> LowerHex for Rgb<T>

where T: LowerHex,