Commit c685a6c5 authored by jnml's avatar jnml

Add additional Seek methods

parent d1f6c902
......@@ -449,6 +449,28 @@ func (t *Tree) Seek(k interface{} /*K*/) (e *Enumerator, ok bool) {
}
}
// SeekFirst returns an enumerator positioned on the first KV pair in the tree,
// if any. For an empty tree, err == io.EOF is returned and e will be nil.
func (t *Tree) SeekFirst() (e *Enumerator, err error) {
q := t.first
if q == nil {
return nil, io.EOF
}
return &Enumerator{nil, true, 0, q.d[0].k, q, t, t.ver}, nil
}
// SeekLast returns an enumerator positioned on the last KV pair in the tree,
// if any. For an empty tree, err == io.EOF is returned and e will be nil.
func (t *Tree) SeekLast() (e *Enumerator, err error) {
q := t.last
if q == nil {
return nil, io.EOF
}
return &Enumerator{nil, true, q.c - 1, q.d[q.c-1].k, q, t, t.ver}, nil
}
// Set sets the value associated with k.
func (t *Tree) Set(k interface{} /*K*/, v interface{} /*V*/) {
t.ver++
......
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