beacon 0.2.0

Minimal Serenity beacon chain implementation
Documentation 
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use crate::{Config, BeaconState, Error};

impl<C: Config> BeaconState<C> {
	/// Update crosslinks
	pub fn process_crosslinks(&mut self) -> Result<(), Error> {
		self.previous_crosslinks = self.current_crosslinks.clone();
		for epoch in &[self.previous_epoch(), self.current_epoch()] {
			for offset in 0..self.committee_count(*epoch) {
				let shard = (self.start_shard(*epoch)? + offset) % C::shard_count();
				let crosslink_committee = self.crosslink_committee(*epoch, shard)?;
				let (winning_crosslink, attesting_indices) =
					self.winning_crosslink_and_attesting_indices(*epoch, shard)?;
				if 3 * self.total_balance(&attesting_indices) >=
					2 * self.total_balance(&crosslink_committee)
				{
					self.current_crosslinks[shard as usize] = winning_crosslink;
				}
			}
		}

		Ok(())
	}
}