Trait cfg::history::HistorySource

pub trait HistorySource<H> {
    fn build(&mut self, lhs: Symbol, rhs: &[Symbol]) -> H;
}

A trait for history factories.

Required Methods

fn build(&mut self, lhs: Symbol, rhs: &[Symbol]) -> H

Create a history.

Implementors

• impl<'a, H> HistorySource<H> for CloneHistory<'a, H> where H: Clone
• impl<H> HistorySource<H> for DefaultHistory<H> where H: Default
• impl HistorySource<NullHistory> for NullHistorySource