SparseMatIndexer<T> .Item Property (Int32, Int32, Nullable<Int64> )

public abstract T this[
	int i0,
	int i1,
	Nullable<long> hashVal = null
] { get; set; }

Public MustOverride Default Property Item ( 
	i0 As Integer,
	i1 As Integer,
	Optional hashVal As Nullable(Of Long) = Nothing
) As T
	Get
	Set

public:
virtual property T default[int i0, int i1, Nullable<long long> hashVal = nullptr] {
	T get (int i0, int i1, Nullable<long long> hashVal = nullptr) abstract;
	void set (int i0, int i1, Nullable<long long> hashVal = nullptr, T value) abstract;
}

abstract Item : 'T with get, set

function get_Item(i0, i1, hashVal);
function set_Item(value);