MaybeSomethingNothingHelpers.cs

namespace Functional.Maybe
{
	/// <summary>
	/// IsSomething, IsNothing and shorthands to create typed Nothing of correct type
	/// </summary>
	public static class MaybeSomethingNothingHelpers
	{
		/// <summary>
		/// Has a value inside
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="a"></param>
		/// <returns></returns>
		public static bool IsSomething<T>(this Maybe<T> a)
		{
			return a.HasValue;
		}

		/// <summary>
		/// Has no value inside
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="a"></param>
		/// <returns></returns>
		public static bool IsNothing<T>(this Maybe<T> a)
		{
			return !a.IsSomething();
		}

		/// <summary>
		/// Создает "ничто" такого же типа, как исходный объект
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="_"></param>
		/// <returns></returns>
		public static Maybe<T> NothingOf<T>(this Maybe<T> _)
		{
			return Maybe<T>.Nothing;
		}

		/// <summary>
		/// Создает "ничто" такого же типа, как исходный объект
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="_"></param>
		/// <returns></returns>
		public static Maybe<T> NothingOf<T>(this T _)
		{
			return Maybe<T>.Nothing;
		}
	}
}