On Fri, 15 Nov 2013 23:41:38 +0100, Brad Anderson wrote: > On Friday, 15 November 2013 at 22:39:40 UTC, Jacek Furmankiewicz wrote: >> Many other languages are starting to frown on returning null values >> from methods (due to NullPointerException risks, etc) >> and wrapping them instead in an Optional<T> like in >> >> Scala: >> http://blog.danielwellman.com/2008/03/using-scalas-op.html >> >> Google Guava for Java: (now rolled into the base JDK for Java 8): >> https://code.google.com/p/guava-libraries/wiki/ UsingAndAvoidingNullExplained >> >> Is there a similar approach in D? Or maybe an equivalent is in a >> commonly used external library? > > Sounds like std.typecons.Nullable to me.
No, Nullable adds a potential null state to value types, e.g. it allows you to null an int. To the best of my knowledge there is no Maybe/ Optional type in Phobos, but they're extremely easy to implement yourself. Here's a Maybe type that I just threw together: http:// dpaste.dzfl.pl/e4b762ed
