Struct Null

graph/iterator/iterator.go:55–55

Here we define the simplest iterator -- the Null iterator. It contains nothing. It is the empty set. Often times, queries that contain one of these match nothing, so it's important to give it a special iterator.

// It is the empty set. Often times, queries that contain one of these match nothing,
// so it's important to give it a special iterator.
type Null struct{}

// Fairly useless New function.
func NewNull() *Null {