/// <summary>
/// 构造一个迭代器
/// </summary>
/// <param name="lruCache">近期最少使用缓存</param>
internal Enumerator(LruCache <TKey, TVal> lruCache, bool forward)
{
this.lruCache = lruCache;
this.forward = forward;
}
/// <summary>
/// 构造一个迭代器
/// </summary>
/// <param name="lruCache">近期最少使用缓存</param>
internal Enumerator(LruCache <TKey, TVal> lruCache)
{
this.lruCache = lruCache;
}