Trait frame_support::traits::FilterStack

[+] Show declaration

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);
}

[−] Expand description

Trait to add a constraint onto the filter.

Associated Types

type Stack[−]

The type used to archive the stack.

Required methods

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

Add a new constraint onto the filter.

fn pop()[−]

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

fn take() -> Self::Stack[−]

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

fn restore(taken: Self::Stack)[−]

Restore the filter from a previous take operation.

Implementors