func (g Undirect) From(uid int64) Nodes {
	return newNodeFilterIterator(g.G.From(uid), g.G.To(uid))
}
From returns all nodes in g that can be reached directly from u.
package graph
type Undirect struct {
	G Directed
}
var _ Undirected = Undirect{}
func (g Undirect) Node(id int64) Node { return g.G.Node(id) }
func (g Undirect) Nodes() Nodes { return g.G.Nodes() }