/// <summary>
/// 中身がある時と無い時で処理を行う
/// </summary>
/// <param name="then"></param>
/// <param name="elseThen"></param>
public void IfPresent(Action <T> then, Action elseThen)
{
if (HasValue)
{
NullCheck.DoAction(Value, then);
}
else
{
elseThen();
}
}
/// <summary>
/// 中身を代替を指定して取得
/// </summary>
/// <typeparam name="U"></typeparam>
/// <param name="value"></param>
/// <returns></returns>
public T OrElse <U>(U value)
where U : T
=> HasValue?NullCheck.DoAction(Value, Functional.Id) : value;
/// <summary>
/// 中身がある時と無い時で処理を行う
/// </summary>
/// <param name="then"></param>
/// <param name="elseThen"></param>
public U IfPresent <U>(Func <T, U> then, Func <U> elseThen)
=> HasValue
? NullCheck.DoAction(Value, then)
: elseThen();