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use std::{error::Error, io, process};
use serde::Serialize;
// Note that structs can derive both Serialize and Deserialize!
#[derive(Debug, Serialize)]
#[serde(rename_all = "PascalCase")]
struct Record<'a> {
city: &'a str,
state: &'a str,
population: Option<u64>,
latitude: f64,
longitude: f64,
}
fn run() -> Result<(), Box<dyn Error>> {
let mut wtr = csv::Writer::from_writer(io::stdout());
wtr.serialize(Record {
city: "Davidsons Landing",
state: "AK",
population: None,
latitude: 65.2419444,
longitude: -165.2716667,
})?;
wtr.serialize(Record {
city: "Kenai",
state: "AK",
population: Some(7610),
latitude: 60.5544444,
longitude: -151.2583333,
})?;
wtr.serialize(Record {
city: "Oakman",
state: "AL",
population: None,
latitude: 33.7133333,
longitude: -87.3886111,
})?;
wtr.flush()?;
Ok(())
}
fn main() {
if let Err(err) = run() {
println!("{}", err);
process::exit(1);
}
}
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