A prototype of columnar data storage using frunk HLists
#[macro_use]
extern crate frunk;
extern crate frunk_core;
use frunk::indices::Here;
use frunk::prelude::*;
use frunk::Generic;
use frunk_column::*;
use std::iter::FromIterator;
fn main() {
#[derive(Clone, Copy, Debug, Generic, PartialEq)]
struct Planet {
mass_kg: f64,
radius_m: f64,
habitable: bool,
}
let earth = Planet {
mass_kg: 5.976e+24,
radius_m: 6.37814e6,
habitable: true,
};
let mars = Planet {
mass_kg: 6.421e+23,
radius_m: 3.3972e6,
habitable: false,
};
let mut planets = <Planet as Generic>::Repr::new_frame();
planets.push(frunk::into_generic(earth));
planets.push(frunk::into_generic(mars));
let hlist_pat![_mass_kg, radius_m, ...] = &planets;
assert_eq!(radius_m, &[6.37814e6, 3.3972e6]);
assert_eq!(planets.row(1), Some(frunk::into_generic(mars)));
assert_eq!(
Vec::from_iter(planets.into_iter().map::<Planet, _>(frunk::from_generic)),
vec![earth, mars]
);
}
License: MIT/Apache-2.0