/// <summary>
/// Apply the previously specified action to all elements except the last and then apply a different action to the last one.
/// </summary>
/// <param name="sequence"></param>
/// <param name="action"></param>
/// <typeparam name="T"></typeparam>
public static void ToAllWithDifferentLast <T>(this IActionApplyingEnumerable <T> sequence, Action <T> action)
{
if (sequence == null)
{
throw new ArgumentNullException(nameof(sequence));
}
using (var iterator = sequence.Sequence.GetEnumerator())
{
var previous = default(T);
var any = false;
while (iterator.MoveNext())
{
if (any)
{
sequence.Action.Invoke(previous);
}
previous = iterator.Current;
any = true;
}
if (any)
{
action.Invoke(previous);
}
}
}
/// <summary>
/// Apply the previously specified action to all elements except for the last one.
/// </summary>
/// <param name="sequence"></param>
/// <typeparam name="T"></typeparam>
public static void ToAllExceptLast <T>(this IActionApplyingEnumerable <T> sequence)
{
if (sequence == null)
{
throw new ArgumentNullException(nameof(sequence));
}
foreach (var a in sequence.Sequence.ButLast())
{
sequence.Action.Invoke(a);
}
}
/// <summary>
/// Apply the previously specified action to all elements and then apply an additional action to the last one.
/// </summary>
/// <param name="sequence">Items.</param>
/// <param name="action">Action.</param>
/// <typeparam name="T">The 1st type parameter.</typeparam>
public static void ToAllAndThenApplyToLast <T>(this IActionApplyingEnumerable <T> sequence, Action <T> action)
{
if (sequence == null)
{
throw new ArgumentNullException(nameof(sequence));
}
var outer = default(T);
var any = false;
foreach (var a in sequence.Sequence)
{
outer = a;
sequence.Action.Invoke(a);
any = true;
}
if (any)
{
action.Invoke(outer);
}
}
