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

pub trait FilterStack<T>: Contains<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

The type used to archive the stack.

Required methods

Add a new constraint onto the filter.

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

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

Restore the filter from a previous take operation.