Struct cfg::history::NullHistorySource [−] [src]

pub struct NullHistorySource;

A source that only works for building NullHistory.

Trait Implementations

`impl HistorySource<NullHistory> for NullHistorySource`

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

Derived Implementations

`impl Copy for NullHistorySource`

`impl Clone for NullHistorySource`

`fn clone(&self) -> NullHistorySource`

1.0.0`fn clone_from(&mut self, source: &Self)`

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