graph: imported graph as a subtree

graph/network/network_test.go

@@ -0,0 +1,33 @@
+// Copyright ©2015 The gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package network
+
+const (
+	A = iota
+	B
+	C
+	D
+	E
+	F
+	G
+	H
+	I
+	J
+	K
+)
+
+// set is an integer set.
+type set map[int]struct{}
+
+func linksTo(i ...int) set {
+	if len(i) == 0 {
+		return nil
+	}
+	s := make(set)
+	for _, v := range i {
+		s[v] = struct{}{}
+	}
+	return s
+}