.

wcfs/internal/xbtree/δbtail.go

@@ -83,7 +83,7 @@ type ΔTail struct {
 	// XXX -> δZtail
 	ΔZtail *zodb.ΔTail // raw ZODB changes; Kept to rebuild δBtail/byRoot after new Track
 
-	δroot  []ΔRoots // which BTree were changed; Noted only by keys ∈ tracket subset
+//	δroot  []ΔRoots // which BTree were changed; Noted only by keys ∈ tracket subset
 	byRoot map[*Tree]*ΔTreeTail // root -> k/v change history; only for keys ∈ tracket subset
 
 	// XXX or ask client provide db on every call?
@@ -103,12 +103,14 @@ type Δ struct {
 }
 
 
+/*
 // ΔRoots describes which BTrees were change in one revision.
 // XXX kill?
 type ΔRoots struct {
 	Rev     zodb.Tid
 	Changev []*Tree	// root XXX -> Oid?	XXX -> SetTree?
 }
+*/
 
 // ΔTreeTail represent tail of revisional changes to one BTree.
 //
@@ -163,7 +165,6 @@ func (δb *ΔTail) Tail() zodb.Tid {
 //
 // XXX δBtail is rebuild to also include keys corresponding to added nodes.
 //
-// XXX path is at @at state.
 // XXX objects in path must be with .PJar().At() == .head
 // XXX path -> []oid ?
 //
@@ -256,10 +257,8 @@ func (btail *ΔTail) Update(δZ *zodb.EventCommit) Δ {
 //
 // if revExact=False - rev is upper estimate for the revision.
 //
-// XXX only tracked set?
-//
 // XXX at must ∈ (tail, head]	XXX [tail ?
-// XXX key must be tracked -> yes
+// XXX key must be tracked
 func (btail *ΔTail) Get(root *Tree, key Key, at zodb.Tid) (value Value, ok bool, rev zodb.Tid, revExact bool) {
 	// XXX key not tracked		-> panic
 	// XXX at not ∈ (tail, head]	-> panic

wcfs/δftail.go

@@ -74,6 +74,7 @@ type ΔF struct {
 
 // NewΔFtail creates new ΔFtail object.
 //
+// Initial tracked set is empty.
 // Initial coverage of created ΔFtail is (at₀, at₀].
 func NewΔFtail(at0 zodb.Tid) *ΔFtail {
 	return &ΔFtail{