Trait tracing::stdlib::fmt::UpperExp

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

E formatting.

The UpperExp trait should format its output in scientific notation with an upper-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");

Implementing UpperExp on a type:

use std::fmt;

struct Length(i32);

impl fmt::UpperExp for Length {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let val = f64::from(self.0);
        fmt::UpperExp::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"
);

Required Methods§

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

Formats the value using the given formatter.

Implementors§

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impl UpperExp for f32

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impl UpperExp for f64

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impl UpperExp for i8

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impl UpperExp for i16

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impl UpperExp for i32

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impl UpperExp for i64

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impl UpperExp for i128

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impl UpperExp for isize

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impl UpperExp for u8

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impl UpperExp for u16

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impl UpperExp for u32

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impl UpperExp for u64

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impl UpperExp for u128

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impl UpperExp for usize

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

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

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