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• LLVM: bitcode with llvm-gcc (mingw) for windows

  - by TheShow

  Hi, i'm currently building a small JIT compiler. For the language I need a runtime library for some special math functions. I think the best would be to compile the lib to bitcode and link it. The compiler should be integrated in a product and as of this, it must work under windows (VC10, 64bit). So is it possible to build the math lib with the mingw llvm-gcc build an link it later with the JITed Code? Or are there any problems regarding the portability of the bitcode build with llvm-gcc under mingw? If there are problems, what solution would you suggest?

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• Extract / Parse Tags from Mixed Content String

  - by Andreas

  Hello, i want to parse Tags from a mixed Content String. The string goes like this: "<PERSON>yasir arafat</PERSON> , the president of the <LOCATION>palestinian authority</LOCATION> , on the defensive , mr . sharon believes , a government official" I only want to use jaxp. Got anybody an idea for this. May an easy way with Expressions. But i need the Element names as well though. Best Regards Andreas

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• Statistical approach to chess?

  - by Chinmay Kanchi

  Reading about how Google solves the translation problem got me thinking. Would it be possible to build a strong chess engine by analysing several million games and determining the best possible move based largely (completely?) on statistics? There are several such chess databases (this is one that has 4.5 million games), and one could potentially weight moves in identical (or mirrored or reflected) positions using factors such as the ratings of the players involved, how old the game is (to factor in improvements in chess theory) etc. Any reasons why this wouldn't be a feasible approach to building a chess engine?

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• Are there any worse sorting algorithms than Bogosort (a.k.a Monkey Sort)?

  - by womp

  My co-workers took me back in time to my University days with a discussion of sorting algorithms this morning. We reminisced about our favorites like StupidSort, and one of us was sure we had seen a sort algorithm that was O(n!). That got me started looking around for the "worst" sorting algorithms I could find. We postulated that a completely random sort would be pretty bad (i.e. randomize the elements - is it in order? no? randomize again), and I looked around and found out that it's apparently called BogoSort, or Monkey Sort, or sometimes just Random Sort. Monkey Sort appears to have a worst case performance of O(∞), a best case performance of O(n), and an average performance of O(n * n!). Are there any named algorithms that have worse average performance than O(n * n!)? Or are just sillier than Monkey Sort in general?

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• jQuery form wizard - named anchor links

  - by Jackson

  Hi Team, Using: http://home.aland.net/sundman/ to split a complex form in to 4 steps. As well as as the 'next, back and submit' form buttons, I have created a menu above the form: step 1, step 2, step 3, step 4 linking to the hash tags #: #, #1, #2, #3 so the visitor can decide which step they want to view / edit. This works fine in firefox, but in IE and Chrome it does not seem to work. Anyone have experience with hte jQuery history plugin that can tell me the best way to accomplish this? I would like to link to the form but it is in a password protected area and subject to our NDA. If need be I could try and replicate the issue with a form on our server and link here. Thanks, Jack

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• Is there a way of executing embedded ruby in a javascript file in my /public/javascripts directory?

  - by brad

  I have a form with an ever-growing amount of associated javascript. At present this javascript lives in my form view which is fine, but it's getting larger and starting to overwhelm the form making it difficult to work on the form. I want to put this in a separate file in my /public/javascripts directory but a lot of the javascript is generated by embedded ruby. This embedded ruby is ignored and passed through to the browser if I just put the code here. What is the best way (if any) of having this embedded ruby executed and the javascript being generated in the same way as if it were in my view?

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• How to detect when window is closed when using Show() in WinForms C#

  - by MadBoy

  I've been using ShowDialog() in following way for all my new Windows. SomeGui test = new SomeGui(); test.ShowDialog(); refreshSomeListView(); However recently I've started to use Show() instead of ShowDialog() and it's working much better. The only drawback of this is that refreshSomeListView(); cannot be used like in example above since if i leave it there it's executed instantly when new Window shows up. What's the best way to know that the user has closed test window and that now refreshSomeListView(); should be executed? What's suggested approach for this? Should it involve setting events in test GUI on Close/Closing or there's other / better method?

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• How can a Delphi TForm / TPersistent object calculate its own deserialization time?

  - by mjustin

  For performance tests I need a way to measure the time needed for a form to load its definition from the DFM. All existing forms inherit a custom form class. To capture the current time, this base class needs overriden methods as "extension points": start of the deserialization process after the deserialization (can be implemented by overriding the Loaded procedure) the moment just before the execution of the OnFormCreate event So the log for TMyForm.Create(nil) could look like: - 00.000 instance created - 00.010 before deserialization - 01.823 after deserialization - 02.340 before OnFormCreate Which TObject (or TComponent) methods are best suited? Maybe there are other extension points in the form creation process, please feel free to make suggestions.

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• Ruby on Rails website hosting

  - by sfactor

  i want to start a website. it'll be a small community based website. i've learned a fair bit of ruby on rails and am planning to use it. however, i have never deployed a production website before. i've just practiced in my local computer. i wanted to know what are the things i need to deploy the website on the internet. what is the best place to get a domain name and web hosting, esp for ruby on rails sites. how are cloud based services like amazon EC2 etc different from a traditional web host. which is a better choice. what else might i need to do to deploy a website. also i may happen to have a fair bit of users in the future. so how to go about planning for scalability issues. how to sites like twitter, fmylife.com etc all go about these things.

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• Is there any good programming books forum out there?

  - by prosseek

  I always feel the internet forums are a good way to gain knowledge - asking questions and get some answers from everybody, and SO is a great example. But when I get questions reading some programming books, I wonder to whom can I ask the questions. O'Reilly and PragProg have their own book forums, and some authors open their own forums. Or, we might be able to send an email to the author if that is absolutely necessary. Is there any good forum on programming books? Can you share any good programming book forums on the web? Or, is SO the best place to ask some questions in programming books? I found some book reading forums, but not programming books.

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• Version Control for developers new to source control

  - by Daisetsu

  I've been writing code for a few years now and our backup strategy has been to zip the entire code directory up every few days and put it somewhere else on your hard drive, or occasionally upload it to some online file hosting service. Unfortunately the file hosting service got canceled without telling me and we lost years of backups. It's come down to the point where I finally have to learn to use version control. The only problems are My boss really doesn't like SVN, he tried it and it had a high learning curve (at least his client). We need a reliable place to host it (we can pay a reasonable amount). Can someone suggest what may be the best version control system and client for a newbie which won't be too annoying. Second what is a good remote version control service?

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• pubsubhubbub link with Project Rome

  - by itsadok

  I want to use Project Rome to create an RSS feed, using the code from the tutorial as base. I would like to add a pubsubhubbub discovery link, but there doesn't seem to be a general way to do so. I can use a Link object if I create an atom feed (which I don't want to limit myself to), or I can just add foreign markup, like this: // import org.jdom.Element Element element = new Element("link"); element.setAttribute("rel", "hub"); element.setAttribute("href", "https://myhub.example.com/endpoint"); feed.setForeignMarkup(Arrays.asList(element)); But it feels ugly. Is this really the best way to do this?

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• How to use ocx in .Net windows application

  - by Anshuman Roy

  I have to use a ocx in .Net application. In the toolbox, i right clicked and from com tab added the ocx. Now the ocx appeared in the toolbox and added the control to the form. Whe i execute the application got this error 'Could not load file or assembly 'Interop.WINCMP3XLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.'. Can you help me what else needs to be done. I also used the Aximp tool to convert the wrapper dll for the ocx. Now when I used this dll, i could not access the method in the dll. Please can anyone tell me the best way for using ocx in .Net application. Thanks

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• Why is thread local storage so slow?

  - by dsimcha

  I'm working on a custom mark-release style memory allocator for the D programming language that works by allocating from thread-local regions. It seems that the thread local storage bottleneck is causing a huge (~50%) slowdown in allocating memory from these regions compared to an otherwise identical single threaded version of the code, even after designing my code to have only one TLS lookup per allocation/deallocation. This is based on allocating/freeing memory a large number of times in a loop, and I'm trying to figure out if it's an artifact of my benchmarking method. My understanding is that thread local storage should basically just involve accessing something through an extra layer of indirection, similar to accessing a variable via a pointer. Is this incorrect? How much overhead does thread-local storage typically have? Note: Although I mention D, I'm also interested in general answers that aren't specific to D, since D's implementation of thread-local storage will likely improve if it is slower than the best implementations.

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• C# Stream Reader adding \n to XML

  - by Terry

  I use the StreamReader class to obtain XML for my GeoCoding process from Google. StreamReader srGeoCode = new StreamReader(WebRequest.Create(Url).GetResponse().GetResponseStream()); String GeoCodeXml = srGeoCode.ReadToEnd(); XmlDocument XmlDoc = new XmlDocument(); GeoCode oGeoCode = new GeoCode(); XmlDoc.Load(GeoCodeXml); I get XML back but it adds \n and other extras to the XML <?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n<kml xmlns=\"http://earth.google.com/kml/2.0\"><Response>\n <name> I have the same code in VB and it does not do this. I can successfully GeoCode my information using the VB version of this console app. Is there a reason the C# version adds this extra data to the XML that I retrieve back? I am trying my best to convert everything over to C#. I enjoy coding in it over VB.

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• Can I upgrade Xcode to support a newer version of GCC to learn C++0x?

  - by Shane

  I would like to jump in learn C++0x, which has matured to a level I'm happy with. Xcode on Snow Leopard 10.6 is currently at GCC 4.2.1, and the new features I'd like to try, like std::shared_ptr, lambdas, auto, null pointer constant, unicode string literals, and other bits and pieces, require at least 4.3 (I believe). Ideally I'd use Xcode but I'm not even sure if you can manually upgrade the compiler for Xcode. Is this possible? Otherwise, what is the best way to install a different version of GCC that doesn't interfere with the rest of the system? Regards, Shane

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• How to embed multiple tags in Rails routes, like Stackoverflow.

  - by Craig

  When one selects a Tag on stackoverflow, it is added to the end of the Url. Add a second Tag and it is add to the end of the Url after the first Tag, with a '+' delimiter. For example, http://stackoverflow.com/questions/tagged/ruby-on-rails+best-practices. How is this implemented? Is this a routing enhancement or some logic contained in the TagsController? Finally, how does one 'extract' these Tags for filtering (assuming that they are not in the params[] array)?

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• SQL Query to retrieve highest item up to a point in a group

  - by James

  The best way of describing this is I have a table of people with their names and ages. Assume that people with the same surname are from the same family. I need a query in oracle which will retrieve a list of the oldest person in each family, but not older than a certain age. Table: person name surname age =============================== James Smith 23 Sarah Powell 17 Barry Smith 31 Mark Smith 35 Mary Smith 18 Bob Powell 30 How do I retrieve the oldest person in each family under 30? Results I'm after name surname age =============================== James Smith 23 Sarah Powell 17

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• WIX: COM unregistration when removing one of two programs

  - by madbadger

  Hello, I am relatively new to WiX. It is a great tool, but I still need some time to learn it better. I have encountered a problem with registration and unregistration of a COM component. I have created installers for two applications, lets call them A and B. Both are using the same COM component. I have used the heat tool, as recommended. When installing A or B, the component is registered without any problems. But when I install A and B, then remove A (with Add/Remove programs) the COM class gets unregistered and B cannot use it anymore. Is there a clean solution to prevent this from happening? I would like to unregister the COM when BOTH A and B are uninstalled. Any help would be appreciated, Best regards, madbadger

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• Easiest way of unit testing C code with Python

  - by Jon Mills

  I've got a pile of C code that I'd like to unit test using Python's unittest library (in Windows), but I'm trying to work out the best way of interfacing the C code so that Python can execute it (and get the results back). Does anybody have any experience in the easiest way to do it? Some ideas include: Wrapping the code as a Python C extension using the Python API Wrap the C code using SWIG Add a DLL wrapper to the C code and load it into Python using ctypes Add a small XML-RPC server to the c-code and call it using xmlrpclib (yes, I know this seems a bit far-out!) Is there a canonical way of doing this? I'm going to be doing this quite a lot, with different C modules, so I'd like to find a way which is least effort.

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• Java: where should I put anonymous listener logic code?

  - by tulskiy

  Hi, we had a debate at work about what is the best practice for using listeners in java: whether listener logic should stay in the anonymous class, or it should be in a separate method, for example: button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // code here } }); or button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { buttonPressed(); } }); private void buttonPressed() { // code here } which is the recommended way in terms of readability and maintainability? I prefer to keep the code inside the listener and only if gets too large, make it an inner class. Here I assume that the code is not duplicated anywhere else. Thank you.

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• how to change UIKit UIImage:drawInRect method to AppKIt NSImage:drawInRect Method

  - by user322111

  Hi, i'm porting an iphone app to Mac app,there i have to change all the UIKit related class to AppKit. if you can help me on this really appreciate. is this the best way to do below part.. Iphone App--using UIKit UIGraphicsPushContext(ctx); [image drawInRect:rect]; UIGraphicsPopContext(); Mac Os--Using AppKit [NSGraphicsContext saveGraphicsState]; NSGraphicsContext * nscg = [NSGraphicsContext graphicsContextWithGraphicsPort:ctx flipped:YES]; [NSGraphicsContext setCurrentContext:nscg]; NSRect rect = NSMakeRect(offset.x * scale, offset.y * scale, scale * size.width, scale * size.height); [NSGraphicsContext restoreGraphicsState]; [image drawInRect:rect fromRect:NSMakeRect( 0, 0, [image size].width, [image size].height ) operation:NSCompositeClear fraction:1.0];

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• Questions and considerations to ask client for designing a database

  - by Julia

  Hi guys! so as title says, I would like to hear your advices what are the most important questions to consider and ask end-users before designing database for their application. We are to make database-oriented app, with special attenion to pay on db security (access control, encryption, integrity, backups)... Database will also keep some personal information about people, which is considered sensitive by law regulations, so security must be good. I worked on school projects with databases, but this is first time working "in real world", where this db security has real implications. So I found some advices and questions to ask on internet, but here I always get best ones. All help appreciated! Thank you!

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• Entity Framework - Using a lookup (picklist) table with a lookup key

  - by Dave

  I'm working on a WPF application that is working well using the Entity Framework (3.5 SP1) for complicated table structures. The problem now is I want to get a list from the EF that includes lookups into a picklist table that has multiple picklists in it. In SQL I would write a sub select as such: SELECT Name, (Select typeName from PickLists where type_id = items.type_id and picklist_key=333) as Type_desc FROM Items There are no Foreign keys for this, and the picklists table is never updated using the EF, so it is read only as far as the EF is concerned. I'm not sure the best method to put this into the model if at all. I'm displaying in a read-only datagrid on a dashboard. Thanks!

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• What are the pros and cons using javascript in our form?

  - by justjoe

  I got this code in my submit form <form id="myform" action='hello.php' method='GET' <input type="button" name="newWin" onclick="frmSubmitSameWindows();" <input type="button" name="SameWin" onclick="frmSubmitNewWindows();" <form Then use some js functions in the head; function frmSubmitSameWindows() { form.target = ''; form.submit(); } function frmSubmitNewWindows() { form.target = '_blank'; form.submit(); } What is the pro and cons when we use javascript event function such as frmSubmitSameWin() and frmSubmitNewWin() in our form ? as far as i concern, this is the best solution when we need a way to submit things. Is there other preference ? the better way then the way i got now ?

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