Trait frame_support::traits::FilterStack[−][src]

pub trait FilterStack<T>: Filter<T> {
    type Stack;
    fn push(constraint: impl Fn(&T) -> bool + 'static);

    fn pop();

    fn take() -> Self::Stack;

    fn restore(taken: Self::Stack);
}

Trait to add a constraint onto the filter.

Associated Types

type Stack[src]

The type used to archive the stack.

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Required methods

fn push(constraint: impl Fn(&T) -> bool + 'static)[src]

Add a new constraint onto the filter.

fn pop()[src]

Removes the most recently pushed, and not-yet-popped, constraint from the filter.

fn take() -> Self::Stack[src]

Clear the filter, returning a value that may be used later to restore it.

fn restore(taken: Self::Stack)[src]

Restore the filter from a previous take operation.

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Implementors

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