Crate enum_derived

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.

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Rand

Rand allows for a random variant of an enum, or struct, to be generated.

The rand crate’s rand::random method is used for the default implementation of Rand. Unsupported variants can us the #[custom_rand(your_function)] to extend the functionality.

Note

Support for String, Vec, HashMap<K, V>, and HashSet has been added. The implementation for String and Vec will create an instance with a lenght between 1 and 64 elements. The implementation for HashMap and HashSet will create an instance with 1 to 16 elements.

Example

use rand::{thread_rng, Rng};
use enum_derived::Rand;

#[derive(Rand)]
struct Weather {
    wind_speed: u8,
    #[custom_rand(rand_temp)]
    temperature: f32,
    cloudy: bool,
    location: String,
}

#[derive(Rand)]
enum TravelLogEntry {
    Airplane {
        weather: Weather,
        altitude: u16
    },
    Boat(
        Weather,
        #[custom_rand(rand_boat_speed)]
        u32,
    ),
    #[custom_rand(always_has_sunroof)]
    Car {
        has_sunroof: bool,
    },
    #[weight(3)]
    SpaceShip,
}

#[derive(Rand)]
pub struct TravelLog(Vec<TravelLogEntry>);

fn sample_rand_call() {
    let travel_log = TravelLog::rand();
}

fn always_has_sunroof() -> TravelLogEntry {
    TravelLogEntry::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)
}

Traits

Rand

Generate a random version of the implementor

Derive Macros

Rand

Derive Rand for any enum or struct