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.

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Implementors

impl HistorySource<History> for BuildHistory

fn build(&mut self, _lhs: Symbol, rhs: &[Symbol]) -> History

impl HistorySource<NullHistory> for NullHistorySource

fn build(&mut self, _lhs: Symbol, _rhs: &[Symbol]) -> NullHistory

impl<'a, H> HistorySource<H> for CloneHistory<'a, H> where
    H: Clone, 

fn build(&mut self, _lhs: Symbol, _rhs: &[Symbol]) -> H

impl<H> HistorySource<H> for DefaultHistory<H> where
    H: Default, 

fn build(&mut self, _lhs: Symbol, _rhs: &[Symbol]) -> H

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