Function clap_num::si_number

pub fn si_number<T>(s: &str) -> Result<T, String> where
    <T as TryFrom<u128>>::Error: Display,
    <T as FromStr>::Err: Display,
    T: CheckedAdd,
    T: CheckedMul,
    T: CheckedSub,
    T: FromStr,
    T: PartialOrd,
    T: TryFrom<u128>,
    T: Zero, 

Validate a signed or unsigned integer value with a metric prefix.

This can accept strings with the (case sensitive) SI symbols.

Symbol	Name	Value
Y	yotta	1_000_000_000_000_000_000_000_000
Z	zetta	1_000_000_000_000_000_000_000
E	exa	1_000_000_000_000_000_000
P	peta	1_000_000_000_000_000
T	tera	1_000_000_000_000
G	giga	1_000_000_000
M	mega	1_000_000
k	kilo	1_000

The strings can be provided with a decimal, or using the SI symbol as the decimal separator.

String	Value
3k3	3300
3.3k	3300
1M	1_000_000

Example

This allows for resistance value to be passed using SI symbols.

use clap::Clap;
use clap_num::si_number;

#[derive(Clap)]
struct Args {
    #[clap(short, long, parse(try_from_str=si_number))]
    resistance: u128,
}

To run this example use cargo run --example resistance, giving arguments to the program after --, for example:

$ cargo run --example resistance -- --resistance 1M1
Resistance: 1100000 ohms