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/**
* Copyright (c) Rich Hickey. All rights reserved.
* The use and distribution terms for this software are covered by the
* Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
* which can be found in the file CPL.TXT at the root of this distribution.
* By using this software in any fashion, you are agreeing to be bound by
* the terms of this license.
* You must not remove this notice, or any other, from this software.
**/
using System;
using System.Collections;
namespace clojure.lang
{
public class EnumeratorSeq : ISeq{
IEnumerator e;
volatile ISeq _rest;
public static EnumeratorSeq create(IEnumerator e){
if(e.MoveNext())
return new EnumeratorSeq(e);
return null;
}
EnumeratorSeq(IEnumerator e){
this.e = e;
this._rest = this;
}
public Object first() {
return e.Current;
}
public ISeq rest() {
if(_rest == this)
{
lock(this){
if(_rest == this)
{
_rest = create(e);
}
}
}
return _rest;
}
}
}
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