Trait alloc::fmt::LowerExp

1.0.0 · source ·
pub trait LowerExp {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}
Expand description

e formatting.

The LowerExp trait should format its output in scientific notation with a lower-case e.

For more information on formatters, see the module-level documentation.

Examples

Basic usage with f64:

let x = 42.0; // 42.0 is '4.2e1' in scientific notation

assert_eq!(format!("{x:e}"), "4.2e1");
Run

Implementing LowerExp on a type:

use std::fmt;

struct Length(i32);

impl fmt::LowerExp for Length {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let val = f64::from(self.0);
        fmt::LowerExp::fmt(&val, f) // delegate to f64's implementation
    }
}

let l = Length(100);

assert_eq!(
    format!("l in scientific notation is: {l:e}"),
    "l in scientific notation is: 1e2"
);

assert_eq!(
    format!("l in scientific notation is: {l:05e}"),
    "l in scientific notation is: 001e2"
);
Run

Required Methods§

source

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

Formats the value using the given formatter.

Implementors§

source§

impl LowerExp for f32

source§

impl LowerExp for f64

1.42.0 · source§

impl LowerExp for i8

1.42.0 · source§

impl LowerExp for i16

1.42.0 · source§

impl LowerExp for i32

1.42.0 · source§

impl LowerExp for i64

1.42.0 · source§

impl LowerExp for i128

1.42.0 · source§

impl LowerExp for isize

1.42.0 · source§

impl LowerExp for u8

1.42.0 · source§

impl LowerExp for u16

1.42.0 · source§

impl LowerExp for u32

1.42.0 · source§

impl LowerExp for u64

1.42.0 · source§

impl LowerExp for u128

1.42.0 · source§

impl LowerExp for usize

source§

impl<T> LowerExp for &Twhere
    T: LowerExp + ?Sized,

source§

impl<T> LowerExp for &mut Twhere
    T: LowerExp + ?Sized,

source§

impl<T, const LANES: usize> LowerExp for Simd<T, LANES>where
    LaneCount<LANES>: SupportedLaneCount,
    T: SimdElement + LowerExp,