03_05_default_values_derive/
03_05_default_values.rs

1use clap::Parser;
2
3#[derive(Parser)]
4#[command(version, about, long_about = None)]
5struct Cli {
6    #[arg(default_value_t = 2020)]
7    port: u16,
8}
9
10fn main() {
11    let cli = Cli::parse();
12
13    println!("port: {:?}", cli.port);
14}