Struct ReductionStack 

pub struct ReductionStack { /* private fields */ }

LIFO stack of ReductionFrames. Bottom-most frame represents the first elimination layer applied; top-most is the most recent. finalize_solution lifts from top to bottom.

Implementations

impl ReductionStack

pub fn is_empty(&self) -> bool

True when no reduction has been pushed (the no-op fast path).

pub fn len(&self) -> usize

Number of layers currently on the stack.

pub fn push(&mut self, frame: ReductionFrame)

Push a frame onto the stack (most-recent end).

pub fn top(&self) -> Option<&ReductionFrame>

Reference to the most-recently-pushed frame, if any.

pub fn iter_top_down(&self) -> impl Iterator<Item = &ReductionFrame>

Iterate frames from top (most recent) to bottom (first). PR 8 uses this order when lifting a reduced solution back to the original full space.

pub fn iter_bottom_up(&self) -> impl Iterator<Item = &ReductionFrame>

Iterate frames in push order (bottom to top). Useful when projecting full → reduced through the layers in the same order they were applied.

Trait Implementations

impl Clone for ReductionStack

fn clone(&self) -> ReductionStack

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReductionStack

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ReductionStack

fn default() -> ReductionStack

Returns the “default value” for a type.