Trait wasmer_compiler::lib::std::fmt::LowerHex

1.0.0 · 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.

Implementors§

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impl LowerHex for i8

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impl LowerHex for i16

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impl LowerHex for i32

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impl LowerHex for i64

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impl LowerHex for i128

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impl LowerHex for isize

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impl LowerHex for u8

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impl LowerHex for u16

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impl LowerHex for u32

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impl LowerHex for u64

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impl LowerHex for u128

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impl LowerHex for usize

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impl LowerHex for Bytes

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impl LowerHex for BytesMut

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impl LowerHex for NonZeroI16_be

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impl LowerHex for NonZeroI16_le

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impl LowerHex for NonZeroI16_ube

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impl LowerHex for NonZeroI16_ule

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impl LowerHex for NonZeroI32_be

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impl LowerHex for NonZeroI32_le

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impl LowerHex for NonZeroI32_ube

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impl LowerHex for NonZeroI32_ule

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impl LowerHex for NonZeroI64_be

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impl LowerHex for NonZeroI64_le

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impl LowerHex for NonZeroI64_ube

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impl LowerHex for NonZeroI64_ule

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impl LowerHex for NonZeroI128_be

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impl LowerHex for NonZeroI128_le

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impl LowerHex for NonZeroI128_ube

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impl LowerHex for NonZeroI128_ule

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impl LowerHex for NonZeroU16_be

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impl LowerHex for NonZeroU16_le

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impl LowerHex for NonZeroU16_ube

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impl LowerHex for NonZeroU16_ule

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impl LowerHex for NonZeroU32_be

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impl LowerHex for NonZeroU32_le

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impl LowerHex for NonZeroU32_ube

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impl LowerHex for NonZeroU32_ule

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impl LowerHex for NonZeroU64_be

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impl LowerHex for NonZeroU64_le

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impl LowerHex for NonZeroU64_ube

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impl LowerHex for NonZeroU64_ule

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impl LowerHex for NonZeroU128_be

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impl LowerHex for NonZeroU128_le

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impl LowerHex for NonZeroU128_ube

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impl LowerHex for NonZeroU128_ule

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impl LowerHex for Protection

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impl LowerHex for SegmentFlags

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impl LowerHex for SymbolFlags

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impl LowerHex for WasmFeatures

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impl LowerHex for i16_be

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impl LowerHex for i16_le

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impl LowerHex for i16_ube

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impl LowerHex for i16_ule

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impl LowerHex for i32_be

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impl LowerHex for i32_le

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impl LowerHex for i32_ube

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impl LowerHex for i32_ule

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impl LowerHex for i64_be

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impl LowerHex for i64_le

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impl LowerHex for i64_ube

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impl LowerHex for i64_ule

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impl LowerHex for i128_be

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impl LowerHex for i128_le

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impl LowerHex for i128_ube

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impl LowerHex for i128_ule

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impl LowerHex for u16_be

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impl LowerHex for u16_le

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impl LowerHex for u16_ube

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impl LowerHex for u16_ule

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impl LowerHex for u32_be

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impl LowerHex for u32_le

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impl LowerHex for u32_ube

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impl LowerHex for u32_ule

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impl LowerHex for u64_be

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impl LowerHex for u64_le

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impl LowerHex for u64_ube

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impl LowerHex for u64_ule

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impl LowerHex for u128_be

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impl LowerHex for u128_le

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impl LowerHex for u128_ube

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impl LowerHex for u128_ule

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impl<O> LowerHex for I16<O>
where O: ByteOrder,

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impl<O> LowerHex for I32<O>
where O: ByteOrder,

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impl<O> LowerHex for I64<O>
where O: ByteOrder,

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impl<O> LowerHex for I128<O>
where O: ByteOrder,

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impl<O> LowerHex for U16<O>
where O: ByteOrder,

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impl<O> LowerHex for U32<O>
where O: ByteOrder,

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impl<O> LowerHex for U64<O>
where O: ByteOrder,

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impl<O> LowerHex for U128<O>
where O: ByteOrder,

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impl<T> LowerHex for &T
where T: LowerHex + ?Sized,

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impl<T> LowerHex for &mut T
where T: LowerHex + ?Sized,

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impl<T> LowerHex for NonZero<T>

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

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

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