UniqueList.cs

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using System.Collections.Generic;
 
namespace System.Xml.Xsl.IlGen;
 
internal sealed class UniqueList<T>
{
    private readonly Dictionary<T, int> _lookup = new Dictionary<T, int>();
 
    private readonly List<T> _list = new List<T>();
 
    public int Add(T value)
    {
        int num;
        if (!_lookup.ContainsKey(value))
        {
            num = _list.Count;
            _lookup.Add(value, num);
            _list.Add(value);
        }
        else
        {
            num = _lookup[value];
        }
        return num;
    }
 
    public T[] ToArray()
    {
        return _list.ToArray();
    }
}