/// <summary>
/// Determines the number of days from one DayOfWeek till the next.
/// </summary>
/// <param name="self">the starting DayOfWeek</param>
/// <param name="next">The ending DayOfWeek</param>
/// <returns>the number of days from <paramref name="self"/> to <paramref name="next"/></returns>
/// <exception cref="ArgumentOutOfRangeException">If either DayOfWeek is not
/// <see cref="DayOfWeekExtensions.InRange"/></exception>
/// <example>
/// Debug.Assert(DayOfWeek.Monday.DaysTill(DayOfWeek.Tuesday) == 1);
/// </example>
public static int DaysTill(this DayOfWeek self, DayOfWeek next)
{
self.CheckRange();
next.CheckRange();
return DaysBetween((int)next, (int)self);
}
public static void Validate(this IConstrainedString val, string arg)
{
if (val == null || !val.CheckRange())
{
throw new ArgumentException(arg);
}
}
/// <summary>
/// Determines the number of days since one DayOfWeek since the previous.
/// </summary>
/// <param name="self">the starting DayOfWeek</param>
/// <param name="prev">The previous DayOfWeek</param>
/// <returns>the number of days since <paramref name="self"/> to <paramref name="prev"/></returns>
/// <exception cref="ArgumentOutOfRangeException">If either DayOfWeek is not
/// <see cref="DayOfWeekExtensions.InRange"/></exception>
/// <example>
/// Debug.Assert(DayOfWeek.Tuesday.DaysSince(DayOfWeek.Monday) == 1);
/// </example>
public static int DaysSince(this DayOfWeek self, DayOfWeek prev)
{
self.CheckRange();
prev.CheckRange();
return DaysBetween((int)self, (int)prev);
}
