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Tag Archives: C#

Fun(c) with C# 3.0

Looking through the list of predefined (or, in Microsoft’s parlance, standard) query operators defined in C# 3.0, there is one that stands out as missing: the ‘map’ function. However, with the new query expression syntax, this is trivial to define: public static IEnumerable<T> Map<F,T>(Func<F,T> func, IEnumerable<F> source) { return from it in source select func(it); [...]

Posted 09 October 2007 † Porges § Uncategorized ‡ Comments (1) ° Also tagged: , , , ,

Lazy Lists in C#

I had the thought—while browsing through some old code—that the code I used to implement futures in C# would be useful for doing things lazily, if you just moved the evaluation phase to when the value was actually demanded… this started me off thinking about how to implement a proper lazily-evaluated list in C#. A [...]

Posted 28 September 2007 † Porges § Uncategorized ‡ Comments (0) ° Also tagged: , , ,

NullPointerException

Why is this such an insidious error in Java? (An opinion piece!) A Comparison Firstly, I’ll show a short comparison between some Java code and some code from a language that doesn’t have NullPointerExceptions, but does have something that allows you to accomplish anything you might want to do with null pointers. This Java code: [...]

Posted 25 May 2007 † Porges § Uncategorized ‡ Comments (0) ° Also tagged: , , , , , , ,

Implementing futures in C#

Why? I was bored, and it didn’t seem to have been done before, so here’s some Future action in C#. The Code using System; using System.IO; using System.Reflection; using System.Threading;   public class Future<T> { public delegate R FutureDelegate<R>(); public Future (FutureDelegate<T> del) { Del = del; Result = del.BeginInvoke(null,null); } private FutureDelegate<T> Del; private [...]

Posted 13 February 2007 † Porges § Uncategorized ‡ Comments (3) ° Also tagged: , , ,