From 6b7ee831d9f1f9b9d8836448cd5588a5490f79e2 Mon Sep 17 00:00:00 2001
From: Emir Pasic <emirpasic@hotmail.com>
Date: Thu, 5 Mar 2015 16:58:35 +0100
Subject: [PATCH] set interface

---
 sets/hashset/hashset.go |  5 +++++
 sets/sets.go            | 29 +++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 sets/sets.go

diff --git a/sets/hashset/hashset.go b/sets/hashset/hashset.go
index e45a4df..16e1619 100644
--- a/sets/hashset/hashset.go
+++ b/sets/hashset/hashset.go
@@ -24,9 +24,14 @@ package hashset
 
 import (
 	"fmt"
+	"github.com/emirpasic/gods/sets"
 	"strings"
 )
 
+func assertInterfaceImplementation() {
+	var _ sets.Interface = (*Set)(nil)
+}
+
 type Set struct {
 	items map[interface{}]struct{}
 }
diff --git a/sets/sets.go b/sets/sets.go
new file mode 100644
index 0000000..07276e1
--- /dev/null
+++ b/sets/sets.go
@@ -0,0 +1,29 @@
+/*
+Copyright (c) Emir Pasic, All rights reserved.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3.0 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library. See the file LICENSE included
+with this distribution for more information.
+*/
+
+package sets
+
+type Interface interface {
+	Add(items ...interface{})
+	Remove(items ...interface{})
+	Contains(items ...interface{}) bool
+	Empty() bool
+	Size() int
+	Clear()
+	Values() []interface{}
+}