/// <summary>
/// Construct a enumerator with the parent object.
/// </summary>
/// <param name="source">The source Permutations object.</param>
public Enumerator(Permutations <T> source)
{
myParent = source;
myLexicographicalOrders = new int[source.myLexicographicOrders.Length];
source.myLexicographicOrders.CopyTo(myLexicographicalOrders, 0);
Reset();
}
/// <summary>
/// Initialize the variations for constructors.
/// </summary>
/// <param name="values">List of values to select variations from.</param>
/// <param name="lowerIndex">The size of each variation set to return.</param>
/// <param name="type">The type of variations set to generate.</param>
private void Initialize(IList <T> values, int lowerIndex, GenerateOption type)
{
myMetaCollectionType = type;
myLowerIndex = lowerIndex;
myValues = new List <T>();
myValues.AddRange(values);
if (type == GenerateOption.WithoutRepetition)
{
List <int> myMap = new List <int>();
int index = 0;
for (int i = 0; i < myValues.Count; ++i)
{
if (i >= myValues.Count - myLowerIndex)
{
myMap.Add(index++);
}
else
{
myMap.Add(Int32.MaxValue);
}
}
myPermutations = new Permutations <int>(myMap);
}
else
{
; // myPermutations isn't used.
}
}
