21 releases (7 breaking)
0.8.2 | Mar 7, 2023 |
---|---|
0.7.0 | Mar 2, 2023 |
#2291 in Rust patterns
1,692 downloads per month
9KB
Enum-Derived
Use Enum-Derived's Rand macro to generate random variants of your enums and structs. All fields are populated with independent random values.
Need custom constraints applied to a variant or field? Use the #[custom_rand(your_function)]
attribute to override the default behavior or extend support to types without default support.
Need some variants to be generated more ofter? Use the #[weight(VARIANT_WEIGHT)]
to change the distribution.
Rand
Rand allows for a random variant of an enum, or struct, to be generated.
The [rand] crates rand::random method is used for the default implementation of [Rand]. Unsupported variants can us the #[custom_rand(your_function)]
to extend the functionality.
use enum_derived::Rand;
#[derive(Rand)]
struct Weather {
wind_speed: u8,
#[custom_rand(rand_temp)]
temperature: f32,
cloudy: bool
}
#[derive(Rand)]
enum TravelLog {
Airplane {
weather: Weather,
altitude: u16
},
Boat(
Weather,
#[custom_rand()]
u32,
),
#[custom_rand(always_has_sunroof)]
Car {
has_sunroof: bool,
},
#[weight(3)]
SpaceShip,
}
fn main() {
let travel_log = TravelLog::rand();
}
fn always_has_sunroof() -> TravelLog {
TravelLog::Car { has_sunroof: true }
}
fn rand_boat_speed() -> u32 {
thread_rng().gen_range(5..50)
}
fn rand_temp() -> f32 {
thread_rng().gen_range(-20.0..120.0)
}
use rand::{thread_rng, Rng};
Dependencies
~2MB
~42K SLoC