/// <summary>
/// Adds the specified item. Will not overwrite existing items.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>Returns the position where the item was added, -1 otherwise.</returns>
public int TryAdd(T item)
{
var index = Interlocked.Increment(ref _index) & (_capacity - 1);
if (_entries.InsertInternal(index, item))
{
return(index);
}
return(-1);
}
/// <summary>
/// Attempts to Adds the specified item at the front.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>
/// <c>true</c> if the item was added; otherwise, <c>false</c>.
/// </returns>
public bool Add(T item)
{
if (_entries.Count < _capacity)
{
var preCount = Interlocked.Increment(ref _preCount);
if (preCount <= _capacity)
{
var index = (Interlocked.Increment(ref _indexEnqueue) - 1) & (_capacity - 1);
if (_entries.InsertInternal(index, item))
{
return(true);
}
}
Interlocked.Decrement(ref _preCount);
}
return(false);
}