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Thread safe Singleton: why the memory model does not guarantee that the new instance will be seen by other threads?

I have read in Jon's Skeet online page about how to create a thread safe Singleton in C# http://csharpindepth.com/Articles/General/Singleton.aspx // Bad code! Do not use! public...
Jon Skeet
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Can you please explain why doesn't the memory model does not guarantee that the new value of instance will be seen by other threads? The memory model is complex and not terribly clearly documented at the moment, but fundamentally... more

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How to convert Linq.IEnumerable(Of String) to formatted Strings

I have a List(Of String) that stores validation errors. Should that list contain any items, I'd like to concatenate them into an HTML list to show each error. Currently this is...
Jon Skeet
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It sounds like you need a combination of Join and Select: String.Join("", _ l.Select(Function(s as String) String.Format("<li>{0}</li>", s)) Of course, you could always write your own JoinFormat extension method - that... more

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IllegalArgumentException using Java8 Base64 decoder

I wanted to use Base64.java to encode and decode files. Encode.wrap(InputStream) and decode.wrap(InputStream) worked but runned slowly. So I used following code. public static...
Jon Skeet
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I strongly suspect that the problem is that you're ignoring the return value from InputStream.read, other than to check for the end of the stream. So this: while (in.read(inBuff) > 0) { // This always decodes the *complete* buffer ... more

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Using XhtmlTextWriter with XmlTextReader

After reading this article, I have decided to update the following code (using XmlDocument) with XmlReader: Rendering controls public string Rendering(Control baseControl) { ...
Jon Skeet
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Is there a room for optimizing the existing code? Absolutely. The first place I'd change has nothing to do with how you load the XML - it's string concatenation. I'd change your recursiveOperation method to: private static string... more

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java: local variable looper is accessed from within inner class; needs to be declared final, but then variable might not have been initialized

I'm using something a bit like the command pattern to create a class which implements a simple interface for a method I reuse frequently, but in different ways. I was able to get...
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You've effectively got a cyclic dependency: your Looper needs to be initialized with the Commandable, and the Commandable needs to be initialized with the Looper. The compiler is absolutely right to complain - imagine if the Looper... more

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Why awaiting cold Task does not throw

I was just experimenting to see what happens when a cold task (i.e. a Task which hasn't been started) is awaited. To my surprise the code just hung forever and "Finsihed" is never...
Jon Skeet
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You're trying to start the task returned by the async method - that isn't the cold task that you started out with. Indeed, if you add some diagnostics to your Task.Run call, you'll see that an exception is thrown: ... more

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How to ignore reference to jetbrains.annotations.dll in NodaTime nuget package xml documentation file

I lean quite heavily on Resharper context actions to generate boilerplate code. The Check parameter for null context action had, up until recently, generated code that performs...
Jon Skeet
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Noda Time deliberately ships with an internal copy of the R# annotations, so that those who do want them can benefit from them - it will know which methods are pure, etc. It sounds like you don't actually want to use annotations at all,... more

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Stream<Set<Path>> to Set<Path>

Here is the Java 8 code, using streams: Set<String> getFields( Path xml ) { final Set<String> fields = new HashSet<>(); for( ... ) { ... ...
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I suspect you want flatMap instead of map, and then use Collectors.toCollection to create the sorted set: final SortedSet<String> fields = files .stream() .parallel() .flatMap(x -> getFields(x).stream()) ... more

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Is the string == overloaded operator actually used in some generic comparison method?

I am currently reading Jon Skeet's C# in Depth, 2nd Edition. I'd like to quote listing 3.5: static bool AreReferencesEqual<T>(T first, T second) where T : class { ...
Jon Skeet
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Yes, there's a massive difference. In example 1, intro1 and intro2 refer to different objects. In examples 2 and 3, intro1 and intro2 have the same value - they refer to the same object, so if you call Object.ReferenceEquals(intro1,... more

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Filter by time range in list of DateTime objects

I have a list of DateTime objects. I need to take from this list only those objects that have time part of the date between '00:00:01' and '12:00:00'. How can I query this...
Jon Skeet
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It seems to me that all you need is the DateTime.TimeOfDay property. I would then recommend changing your conditions slightly if you're able to, so that the lower bound is inclusive and the upper bound is exclusive, e.g. var time =... more

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