| // 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 gen | |
| import "gonum.org/v1/gonum/graph" | |
| // GraphBuilder is a graph that can have nodes and edges added. | |
| type GraphBuilder interface { | |
| HasEdgeBetween(xid, yid int64) bool | |
| graph.Builder | |
| } | |
| func abs(a int) int { | |
| if a < 0 { | |
| return -a | |
| } | |
| return a | |
| } |