rustmax::cxx::alloc::fmt

Trait LowerHex

1.36.0 · Source

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 · Source

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.

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

LowerHex

Trait LowerHex Copy item path

§Examples

Required Methods§

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

§Errors

Dyn Compatibility§

Implementors§

impl LowerHex for Access

impl LowerHex for AccessFlags

impl LowerHex for nix::fcntl::AtFlags

impl LowerHex for rustix::backend::fs::types::AtFlags

impl LowerHex for num_bigint::bigint::BigInt

impl LowerHex for rustmax::num_bigint::BigInt

impl LowerHex for num_bigint::biguint::BigUint

impl LowerHex for rustmax::num_bigint::BigUint

impl LowerHex for rustmax::bytes::Bytes

impl LowerHex for winnow::stream::bytes::Bytes

impl LowerHex for BytesMut

impl LowerHex for CodegenConfig

impl LowerHex for ControlFlags

impl LowerHex for CreateFlags

impl LowerHex for DupFlags

impl LowerHex for EventKindMask

impl LowerHex for EventMask

impl LowerHex for nix::fcntl::FallocateFlags

impl LowerHex for rustix::backend::fs::types::FallocateFlags

impl LowerHex for FdFlag

impl LowerHex for FdFlags

impl LowerHex for FsFlags

impl LowerHex for Gid

impl LowerHex for IFlags

impl LowerHex for IfdPointer

impl LowerHex for InputFlags

impl LowerHex for LocalFlags

impl LowerHex for MFdFlags

impl LowerHex for MemfdFlags

impl LowerHex for nix::sys::stat::Mode

impl LowerHex for rustix::backend::fs::types::Mode

impl LowerHex for Modifiers

impl LowerHex for OFlag

impl LowerHex for OFlags

impl LowerHex for OutputFlags

impl LowerHex for PollFlags

impl LowerHex for PosixSpawnFlags

impl LowerHex for ReadFlags

impl LowerHex for ReadWriteFlags

impl LowerHex for nix::fcntl::RenameFlags

impl LowerHex for rustix::backend::fs::types::RenameFlags

impl LowerHex for ResolveFlag

impl LowerHex for ResolveFlags

impl LowerHex for SFlag

impl LowerHex for SaFlags

impl LowerHex for SealFlag

impl LowerHex for SealFlags

impl LowerHex for SfdFlags

impl LowerHex for StatVfsMountFlags

impl LowerHex for StatxAttributes

impl LowerHex for StatxFlags

impl LowerHex for Transformations

impl LowerHex for Uid

impl LowerHex for WaitPidFlag

impl LowerHex for WatchFlags

impl LowerHex for WatchMask

impl LowerHex for XattrFlags

impl LowerHex for bf16

impl LowerHex for f16

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<'a, I> LowerHex for rustmax::itertools::Format<'a, I>where I: Iterator, <I as Iterator>::Item: LowerHex,

Trait LowerHex

impl<'a, I> LowerHex for rustmax::itertools::Format<'a, I>
where I: Iterator, <I as Iterator>::Item: LowerHex,

impl<'a, I> LowerHex for itertools::format::Format<'a, I>
where I: Iterator, <I as Iterator>::Item: LowerHex,

impl<'a, I> LowerHex for itertools::format::Format<'a, I>
where I: Iterator, <I as Iterator>::Item: LowerHex,

impl<'s, T> LowerHex for SliceVec<'s, T>
where T: LowerHex,

impl<A> LowerHex for ArrayVec<A>
where A: Array, <A as Array>::Item: LowerHex,

impl<A> LowerHex for TinyVec<A>
where A: Array, <A as Array>::Item: LowerHex,

impl<D> LowerHex for StyledObject<D>
where D: LowerHex,

impl<L, R> LowerHex for Either<L, R>
where L: LowerHex, R: 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 Bgr<T>
where T: LowerHex,

impl<T> LowerHex for Complex<T>
where T: LowerHex + Num + PartialOrd + Clone,

impl<T> LowerHex for GenericArray<u8, T>
where T: ArrayLength<u8> + Add, <T as Add>::Output: ArrayLength<u8>,

impl<T> LowerHex for NonZero<T>
where T: ZeroablePrimitive + LowerHex,

impl<T> LowerHex for Ratio<T>
where T: LowerHex + Clone + Integer,

impl<T> LowerHex for Rgb<T>
where T: LowerHex,

impl<T> LowerHex for Saturating<T>
where T: LowerHex,

impl<T> LowerHex for Wrapping<T>
where T: LowerHex,