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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;
namespace clojure.lang
{
public class FnSeq : ISeq{
Object _first;
IFn restFn;
volatile ISeq _rest;
public FnSeq(Object first, IFn restFn) {
this._first = first;
this.restFn = restFn;
this._rest = this;
}
public Object first() {
return _first;
}
public ISeq rest() {
if(_rest != this)
return _rest;
lock(this){
if(_rest == this)
{
_rest = (ISeq) restFn.invoke();
restFn = null;
}
return _rest;
}
}
}
}
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