public static Option <TSource> Where <TSource>(this Option <TSource> source, Func <TSource, bool> predicate)
{
if (predicate == null)
{
throw new ArgumentNullException("predicate");
}
return(SelectMany(source, x => predicate(x) ? Option.GetSome(x) : Option.GetNone <TSource>(), (x, y) => y));
}
public static Option <T> AsOption <T>(this T value)
{
if (ReferenceEquals(null, value))
{
return(Option.GetNone <T>());
}
return(Option.GetSome(value));
}
public Option <TResult> Bind <TResult>(Func <T, Option <TResult> > func)
{
if (func == null)
{
throw new ArgumentNullException("func");
}
if (IsNone)
{
return(Option.GetNone <TResult>());
}
return(func(_value));
}
public Option <TResult> Transform <TResult>(Func <T, TResult> func)
{
if (func == null)
{
throw new ArgumentNullException("func");
}
if (_isSome)
{
return(Option.GetSome(func(_value)));
}
else
{
return(Option.GetNone <TResult>());
}
}