Struct FusedColumnBuilder 

pub struct FusedColumnBuilder { /* private fields */ }

Streams graph-executor tape deltas into advice columns.

Column storage is [AdviceColumns<Fr>] (DeviceBuffers under halo2-gpu, Vecs otherwise); placement is a pure function of the tape offset so disjoint deltas may arrive in any order. Layout mirrors PagedWitnessContext::push_advice (gate columns split at pinned break points, break value duplicated at row 0 of the next column) and BaseCircuitBuilder::assign_lookups_in_phase (lookup columns round-robin: value i at column i % L, row i / L).

Columns are zero-filled and allocated on the first Self::append, then segments write directly into their row range — no intermediate host buffer.

Implementations

impl FusedColumnBuilder

pub fn new( n: usize, num_advice_columns: usize, break_points: Vec<usize>, lookup_col_indices: Vec<usize>, ) -> Self

pub fn append( &mut self, advice_offset: usize, advice_delta: &[Fr], lookup_offset: usize, lookup_delta: &[Fr], )

Writes advice_delta (starting at advice_offset) and lookup_delta (starting at lookup_offset) into the advice columns. Placement is a pure function of the offsets, so disjoint deltas may arrive in any order.

pub fn take_columns(&mut self) -> AdviceColumns<Fr>

Consumes the advice columns, leaving the builder empty.