A rust macro to build a static Map based on const array.
The idea is that you define your map first, and then you can use it wheather nessary.
use maparr::maparr;
maparr!(
Continents;
ASIA,
AFRICA,
AMERICA_NORTH,
AMERICA_SOUTH,
ANTARCTICA,
EUROPE,
AUSTRALIA,
);
const CONTINENT_SQUARE_MILES: Continents<usize> = maparr!(
Continents;
ASIA = 17_212_000,
AFRICA = 11_608_000,
AMERICA_NORTH = 9_365_000,
AMERICA_SOUTH = 6_880_000,
ANTARCTICA = 5_100_000,
EUROPE = 3_837_000,
AUSTRALIA = 2_968_000,
);
fn main() {
for (sq_miles, continent) in CONTINENT_SQUARE_MILES.into_iter().zip(Continents::names()) {
println!("{continent:15} = {sq_miles:10} (sq mi)");
}
}You shall expect to get the following output in stdout.
ASIA = 17212000 (sq mi)
AFRICA = 11608000 (sq mi)
AMERICA_NORTH = 9365000 (sq mi)
AMERICA_SOUTH = 6880000 (sq mi)
ANTARCTICA = 5100000 (sq mi)
EUROPE = 3837000 (sq mi)
AUSTRALIA = 2968000 (sq mi)
You can modify the built map (even in const context if allowed).
use maparr::maparr;
maparr!(
Continents<usize>;
ASIA,
AFRICA,
AMERICA_NORTH,
AMERICA_SOUTH,
ANTARCTICA,
EUROPE,
AUSTRALIA,
);
fn main() {
let mut continents = maparr!(
Continents;
ASIA = 17_212_000,
AFRICA = 11_608_000,
AMERICA_NORTH = 9_365_000,
AMERICA_SOUTH = 6_880_000,
ANTARCTICA = 5_100_000,
EUROPE = 3_837_000,
AUSTRALIA = 2_968_000,
);
continents.set(Continents::ASIA, 17_212_001);
assert_eq!(continents[Continents::ASIA], 17_212_001);
continents = continents.map(|value| value * 2);
assert_eq!(continents[Continents::ASIA], 17_212_001 * 2);
}After being done I've got to know that there's already some takes on the same problem. The list just have the ones I've found, there might be other/better ones.