Trait frame_support::traits::FilterStack

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pub trait FilterStack<T>: Contains<T> {
    type Stack;

    // Required methods
    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.

Required Associated Types§

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type Stack

The type used to archive the stack.

Required Methods§

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

Add a new constraint onto the filter.

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fn pop()

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

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fn take() -> Self::Stack

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

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fn restore(taken: Self::Stack)

Restore the filter from a previous take operation.

Object Safety§

This trait is not object safe.

Implementors§