/// <summary>
/// Retrieves the item at the index specified.
/// </summary>
/// <typeparam name="TTuple">The tuple type.</typeparam>
/// <typeparam name="TItem">The item type.</typeparam>
/// <param name="tuple">The tuple.</param>
/// <param name="index">The index of the item to retrieve.</param>
/// <returns>The item located at the <paramref name="index"/> specified.</returns>
/// <exception cref="InvalidCastException">
/// The item located at <paramref name="index"/> cannot be cast to type <typeparamref name="TItem"/>.
/// </exception>
public static TItem GetTupleItem <TTuple, TItem>([NotNull] this TTuple tuple, int index)
where TTuple : class, IStructuralEquatable, IStructuralComparable, IComparable
{
Type t = GetIndexType(tuple, index);
if (!typeof(TItem).IsAssignableFrom(t))
{
throw new InvalidCastException(
string.Format(
// ReSharper disable once AssignNullToNotNullAttribute
Resources.ExtendedTuple_CannotCastItemAtIndex,
index,
t,
typeof(TItem)));
}
return((TItem)ExtendedTuple <TTuple> .Indexer(tuple, index));
}
/// <summary>
/// Gets the indexer for the specified <see cref="Tuple"/>.
/// </summary>
/// <typeparam name="T">The tuple type.</typeparam>
/// <param name="tuple">The tuple whose indexer we want.</param>
/// <returns>
/// A function that takes an index and retrieves the corresponding item from the specified <paramref name="tuple"/>.
/// </returns>
public static Func <int, object> GetTupleIndexer <T>([NotNull] this T tuple)
where T : class, IStructuralEquatable, IStructuralComparable, IComparable
{
return(i => ExtendedTuple <T> .Indexer(tuple, i));
}