Enum si_scale::prefix::Prefix[−][src]

#[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);