Enum si_scale::prefix::Prefix

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#[repr(i32)]
pub enum Prefix {
Show 17 variants    Yocto,
    Zepto,
    Atto,
    Femto,
    Pico,
    Nano,
    Micro,
    Milli,
    Unit,
    Kilo,
    Mega,
    Giga,
    Tera,
    Peta,
    Exa,
    Zetta,
    Yotta,
}

Expand description

Represents units’ SI prefixes.

Variants

`Yocto`

“yocto” prefix, 1e-24

`Zepto`

“zepto” prefix, 1e-21

`Atto`

“atto” prefix, 1e-18

`Femto`

“femto” prefix, 1e-15

`Pico`

“pico” prefix, 1e-12

`Nano`

“nano” prefix, 1e-9

`Micro`

“micro” prefix, 1e-6

`Milli`

“milli” prefix, 1e-3

`Unit`

unit prefix (empty), 1

`Kilo`

“kilo” prefix, 1e3

`Mega`

“mega” prefix, 1e6

`Giga`

“giga” prefix, 1e9

`Tera`

“tera” prefix, 1e12

`Peta`

“peta” prefix, 1e15

`Exa`

“exa” prefix, 1e18

`Zetta`

“zetta” prefix, 1e21

`Yotta`

“yotta” prefix, 1e24

Implementations

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impl Prefix

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pub fn exponent(&self) -> i32

Returns the exponent e for base.pow(e) to return the total scaling factor. See Base::pow().

For instance,

if self is -12 (“pico”), then exponent() returns -12 so that Base::B1000.pow(-12) returns the scaling factor 1e-12.
if self is 3 (“kilo”), then exponent() returns 3 so that Base::B1024.pow(3) returns the scaling factor 1024.

Trait Implementations

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impl Clone for Prefix

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fn clone(&self) -> Prefix

Returns a copy of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Debug for Prefix

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

Formats the value using the given formatter. Read more

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impl Display for Prefix

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

Formats the value using the given formatter. Read more

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impl From<&'_ Prefix> for &str

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fn from(prefix: &Prefix) -> &'static str

Converts a prefix into its displayable form (&'static str).

Example

use si_scale::prelude::Prefix;

let pfx = Prefix::Tera;
let a_string = format!("value: {} {}B", 1.5, pfx);

assert_eq!(a_string, "value: 1.5 TB");

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impl FromStr for Prefix

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fn from_str(s: &str) -> Result<Self>

Converts a &str into a Prefix if conversion is successful, otherwise return an Err.

Example

use std::str::FromStr;
use si_scale::prelude::Prefix;
use si_scale::Result;

let actual= Prefix::from_str("y");
let expected = Ok(Prefix::Yocto);
assert_eq!(actual, expected);