Substrate Enum

enum_module.rs

use support::{decl_module, decl_storage, StorageValue, dispatch::Result};
use system::ensure_signed;
use parity_codec::{ Encode, Decode };

#[derive(Encode, Decode, Clone, PartialEq)]
#[cfg_attr(feature = "std", derive(Debug))]
pub enum Choices {
	None,
	One,
	Two,
	Three,
}

pub trait Trait: timestamp::Trait {}

decl_storage! {
	trait Store for Module<T: Trait> as TemplateModule {
		Choice: Choices = Choices::None;
	}
}

decl_module! {
	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
		pub fn make_decision(origin, decision: Choices) -> Result {
			let who = ensure_signed(origin)?;
			<Choice<T>>::put(decision);
			Ok(())
		}
	}
}