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  • Why does SFINAE not apply to this?

    - by Simon Buchan
    I'm writing some simple point code while trying out Visual Studio 10 (Beta 2), and I've hit this code where I would expect SFINAE to kick in, but it seems not to: template<typename T> struct point { T x, y; point(T x, T y) : x(x), y(y) {} }; template<typename T, typename U> struct op_div { typedef decltype(T() / U()) type; }; template<typename T, typename U> point<typename op_div<T, U>::type> operator/(point<T> const& l, point<U> const& r) { return point<typename op_div<T, U>::type>(l.x / r.x, l.y / r.y); } template<typename T, typename U> point<typename op_div<T, U>::type> operator/(point<T> const& l, U const& r) { return point<typename op_div<T, U>::type>(l.x / r, l.y / r); } int main() { point<int>(0, 1) / point<float>(2, 3); } This gives error C2512: 'point<T>::point' : no appropriate default constructor available Given that it is a beta, I did a quick sanity check with the online comeau compiler, and it agrees with an identical error, so it seems this behavior is correct, but I can't see why. In this case some workarounds are to simply inline the decltype(T() / U()), to give the point class a default constructor, or to use decltype on the full result expression, but I got this error while trying to simplify an error I was getting with a version of op_div that did not require a default constructor*, so I would rather fix my understanding of C++ rather than to just do what works. Thanks! *: the original: template<typename T, typename U> struct op_div { static T t(); static U u(); typedef decltype(t() / u()) type; }; Which gives error C2784: 'point<op_div<T,U>::type> operator /(const point<T> &,const U &)' : could not deduce template argument for 'const point<T> &' from 'int', and also for the point<T> / point<U> overload.

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  • About inconsistent dll linkage

    - by baris_a
    How can I remove this link warning? You can see code segment that causes this warning. Also Thanks in advance. static AFX_EXTENSION_MODULE GuiCtrlsDLL = { NULL, NULL }; //bla bla // Exported DLL initialization is run in context of running application extern "C" void WINAPI InitGuiCtrlsDLL() { // create a new CDynLinkLibrary for this app new CDynLinkLibrary(GuiCtrlsDLL); // nothing more to do } warning C4273: 'InitGuiCtrlsDLL' : inconsisten t dll linkage I have also export and import definitions, like: #ifdef _GUICTRLS #define GUI_CTRLS_EXPORT __declspec(dllexport) #else #define GUI_CTRLS_EXPORT __declspec(dllimport) #endif

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  • Generic Factorial function in C#

    - by mqpasta
    I want to write a generic function to calculate factorial in C# ... like: static T Factorial<T>(T n) { if (n <= 1) return 1; return Factorial<T>(n - 1); } but obviously having restriction that we can't perform operations on type 'T'. any alternative?

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  • Get current Windows user name within Silverlight

    - by huseyint
    Is it possible to get the currently logged in user's username with Silverlight? You can assume that user has Windows OS and the Silverlight application is hosted in Internet Explorer. Getting the identity from server side with ASP.NET is not an option, this SL application will be hosted on a static HTML file.

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  • NO FBML is working in iframe in facebook using PHP (ie or ff or anywhere else!)

    - by Cyprus106
    I have tried for three days now and gotten nowhere on this.... I absolutely can not get any "fb:" code to render anything! I've tried the exact code in the sandbox and it works fine. I've read through every search result I could find and gotten nowhere... I'm using a standard xd_receiver page, and in the body there's this line: < script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/XdCommReceiver.js" type="text/javascript"></script> Here's my index page. It's basically the stock facebook example code.... <?php require_once 'facebook-platform/php/facebook.php'; //Authentication Keys $appapikey = 'MY_KEY'; // obviously this is my real key $appsecret = 'MY_SECRET'; // same thing $facebook = new Facebook($appapikey, $appsecret); $user_id = $facebook->require_login(); ?> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://www.facebook.com/2008/fbml"> <head></head> <body> <script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php" type="text/javascript"></script> <? echo "<p>Hello, <fb:name uid=\"$user_id\" useyou=\"false\"></fb:name>!</p>"; ?> <script type="text/javascript"> FB_RequireFeatures(["XFBML"], function(){ FB.Facebook.init("<?php echo $appapikey; ?>", "xd_receiver.htm"); }); </script> </body> </html> oddly enough, when I put this code below where it echos the logged in user's name, it does show the id numbers of friends. But again, it won't render their names <?php friends.get API method echo "<p>Friends:"; $friends = $facebook->api_client->friends_get(); $friends = array_slice($friends, 0, 25); foreach ($friends as $friend) { echo "<br>".$friend." - <fb:name uid=\".$user_id.\" useyou=\"false\"></fb:name>"; } echo "</p>"; ?> Here's my settings: Canvas Callback URL http://www.my-actual-website.com/test/ Canvas URL http://apps.facebook.com/gogre_testapp/ FBML/iframe iframe Application Type Website Post-Remove URL http://www.my-actual-website.com/test/ Post-Authorize URL http://www.my-actual-website.com/test/ Please, somebody help me out! I've been trying unsuccessfully for days

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  • how can we use AsynCallback method of web service in asp.net

    - by sameer
    Hi All, I was going through the proxy class which is generated using wsdl.exe found the asyncmethod like BeginAsynXXX() and EndAsyncXXX(). i understood how to utilize them on Windows application but i was wondering how can we use them in Web Application built using asp.net here is the code for web service client build as windows application.can any tell me how we can do this with web application. using System; using System.Runtime.Remoting.Messaging; using MyFactorize; class TestCallback { public static void Main(){ long factorizableNum = 12345; PrimeFactorizer pf = new PrimeFactorizer(); //Instantiate an AsyncCallback delegate to use as a parameter //in the BeginFactorize method. AsyncCallback cb = new AsyncCallback(TestCallback.FactorizeCallback); // Begin the Async call to Factorize, passing in our // AsyncCalback delegate and a reference // to our instance of PrimeFactorizer. IAsyncResult ar = pf.BeginFactorize(factorizableNum, cb, pf); // Keep track of the time it takes to complete the async call // as the call proceeds. int start = DateTime.Now.Second; int currentSecond = start; while (ar.IsCompleted == false){ if (currentSecond < DateTime.Now.Second) { currentSecond = DateTime.Now.Second; Console.WriteLine("Seconds Elapsed..." + (currentSecond - start).ToString() ); } } // Once the call has completed, you need a method to ensure the // thread executing this Main function // doesn't complete prior to the call-back function completing. Console.Write("Press Enter to quit"); int quitchar = Console.Read(); } // Set up a call-back function that is invoked by the proxy class // when the asynchronous operation completes. public static void FactorizeCallback(IAsyncResult ar) { // You passed in our instance of PrimeFactorizer in the third // parameter to BeginFactorize, which is accessible in the // AsyncState property. PrimeFactorizer pf = (PrimeFactorizer) ar.AsyncState; long[] results; // Get the completed results. results = pf.EndFactorize(ar); //Output the results. Console.Write("12345 factors into: "); int j; for (j = 0; j<results.Length;j++){ if (j == results.Length - 1) Console.WriteLine(results[j]); else Console.Write(results[j] + ", "); } } }

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  • Modifying .rdata unicode strings from windows PE files

    - by sdaa
    I have been looking for a way of modifying static strings stored in Windows .exe files in the .rdata section, however I haven't found a real way to do so yet. The whole thing is too complicated to do by hand (in this case by a HEX editor) and so I wanted to know if you have a solution to do so.

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  • How can I do geographic traffic redirection and setup an edge server

    - by don
    Hi, Ours is a webbased software as a service application. Our data centers are located on the west coast, and we would like to provide better user experience to our East coast clients. How can I setup an edge server on the east coast, and serve static data like images and javascript from there, but still refer to west coast server for application logic. -Don

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  • How can i return abstract class from any factory?

    - by programmerist
    using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace EfTestFactory { public abstract class _Company { public abstract List<Personel> GetPersonel(); public abstract List<Prim> GetPrim(); public abstract List<Finans> GetFinans(); } public abstract class _Radyoloji { public abstract List<string> GetRadyoloji(); } public abstract class _Satis { public abstract List<string> GetSatis(); } public abstract class _Muayene { public abstract List<string> GetMuayene(); } public class Company : _Company { public override List<Personel> GetPersonel() { throw new NotImplementedException(); } public override List<Prim> GetPrim() { throw new NotImplementedException(); } public override List<Finans> GetFinans() { throw new NotImplementedException(); } } public class Radyoloji : _Radyoloji { public override List<string> GetRadyoloji() { throw new NotImplementedException(); } } public class Satis : _Satis { public override List<string> GetSatis() { throw new NotImplementedException(); } } public class Muayene : _Muayene { public override List<string> GetMuayene() { throw new NotImplementedException(); } } public class GenoTipController { public object CreateByEnum(DataModelType modeltype) { string enumText = modeltype.ToString(); // will return for example "Company" Type classType = Type.GetType(enumText); // the Type for Company class object t = Activator.CreateInstance(classType); // create an instance of Company class return t; } } public class AntsController { static Dictionary<DataModelType, Func<object>> s_creators = new Dictionary<DataModelType, Func<object>>() { { DataModelType.Radyoloji, () => new _Radyoloji() }, { DataModelType.Company, () => new _Company() }, { DataModelType.Muayene, () => new _Muayene() }, { DataModelType.Satis, () => new _Satis() }, }; public object CreateByEnum(DataModelType modeltype) { return s_creators[modeltype](); } } public class CompanyView { public static List<Personel> GetPersonel() { GenoTipController controller = new GenoTipController(); _Company company = controller.CreateByEnum(DataModelType.Company) as _Company; return company.GetPersonel(); } } public enum DataModelType { Radyoloji, Satis, Muayene, Company } } if i write above codes i see some error: Cannot create an instance of abstract class or interface 'EfTestFactory_Company'How can i solve it? Look please below pic.

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  • Single console in eclipse for both Server and Client

    - by rits
    I am building a client server application using Java Sockets (in Windows XP). For that I need different consoles for both Client and Server(for Input and Output operations). But in eclipse both share a single console. Is there any plugin or some sort of cheat through which I can do this. After googling I got this, http://dev.eclipse.org/newslists/news.eclipse.newcomer/msg17138.html But, this seems to be only for write operations, not read operations. Also, I tried the following to launch application manually, but even this is not working........ package mypack; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.io.PrintStream; public class MySystem { public static void changeStream(String mainFile) throws IOException{ File temp = new File(".") ; String parentPath = temp.getCanonicalPath() ; System.out.println(parentPath); //creation of batch file starts here try{ File f = new File(parentPath + "\\a.bat") ; System.out.println("Created : " + f.createNewFile()); //f.deleteOnExit() ; FileOutputStream fos = new FileOutputStream(f) ; String str = "java " + mainFile ; String batchCommand="@echo off\n"+str+"\npause\nexit"; char arr[] = batchCommand.toCharArray() ; System.out.println(str) ; for(int i = 0 ; i < arr.length ; i++){ fos.write(arr[i]) ; } fos.close() ; } catch(Exception e){ } //creation of batch file ends here //execution of batch file starts here try{ Runtime r = Runtime.getRuntime() ; System.out.println(parentPath + "\\a.bat") ; Process p = r.exec(new String[]{"cmd","/k","start a.bat"},null,new File(parentPath)) ; OutputStream os = (OutputStream)p.getOutputStream() ; System.setOut( new PrintStream(os) ) ; System.out.println("Hello"); } catch(Exception e){ e.printStackTrace(); } //execution of batch file ends here } public static void main(String[] args) throws IOException { MySystem.changeStream("MySystem") ; } }

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  • StackOverflowException in c# when no local variable in the function

    - by dnkulkarni
    when i do this static void Main() { Main(); } I receive stackoverflow exception. As i have read so far about C# they say ONLY local variable of value types (and short living ones) will go on stack. But here in the code there are no local variable to go on stack then what overflows it ? I know from assembly code line Perspective that reference to Main() will go on stack too ? Is that right ?

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  • Set DllImport attribute dynamically

    - by matt-bond
    I am making use of an external unmanaged dll using PInvoke and the DllImport attribute. eg. [DllImport("mcs_apiD.dll", CharSet = CharSet.Auto)] private static extern byte start_api(byte pid, byte stat, byte dbg, byte ka); I am wondering if it is possible to alter the dll file details (mcs_apiD.dll in this example) dynmically in some manner, if for instance I wanted to build against another dll version

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  • Why we use "this" in Extension Methods ?

    - by M.H
    Hi, I want to ask why we use "this" keyword before the parameter in an extension method (C# Language)........... like this function : public static int ToInt(this string number) { return Int32.Parse(number); } I know that we have to use it but I don't know why.

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  • Deploying only changed portions of a war to Tomcat

    - by Marty Pitt
    I'm deploying my application to Tomcat, which currently involves uploading a ~40MB war file to a remote server. Often the changes within the war only affect jars and static content which account for maybe 2 - 3MB's. Is there some tooling I can integrate with my Ant script that can accurately detect the changes to the war and give me a smaller subset to upload?

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  • AutoFixture refactoring

    - by Thomas Jaskula
    I started to use AutoFixture http://autofixture.codeplex.com/ as my unit tests was bloated with a lot of data setup. I was spending more time on seting up the data than to write my unit test. Here's an example of how my initial unit test looks like (example taken from cargo application sample from DDD blue book) [Test] public void should_create_instance_with_correct_ctor_parameters() { var carrierMovements = new List<CarrierMovement>(); var deparureUnLocode1 = new UnLocode("AB44D"); var departureLocation1 = new Location(deparureUnLocode1, "HAMBOURG"); var arrivalUnLocode1 = new UnLocode("XX44D"); var arrivalLocation1 = new Location(arrivalUnLocode1, "TUNIS"); var departureDate1 = new DateTime(2010, 3, 15); var arrivalDate1 = new DateTime(2010, 5, 12); var carrierMovement1 = new CarrierMovement(departureLocation1, arrivalLocation1, departureDate1, arrivalDate1); var deparureUnLocode2 = new UnLocode("CXRET"); var departureLocation2 = new Location(deparureUnLocode2, "GDANSK"); var arrivalUnLocode2 = new UnLocode("ZEZD4"); var arrivalLocation2 = new Location(arrivalUnLocode2, "LE HAVRE"); var departureDate2 = new DateTime(2010, 3, 18); var arrivalDate2 = new DateTime(2010, 3, 31); var carrierMovement2 = new CarrierMovement(departureLocation2, arrivalLocation2, departureDate2, arrivalDate2); carrierMovements.Add(carrierMovement1); carrierMovements.Add(carrierMovement2); new Schedule(carrierMovements).ShouldNotBeNull(); } Here's how I tried to refactor it with AutoFixture [Test] public void should_create_instance_with_correct_ctor_parameters_AutoFixture() { var fixture = new Fixture(); fixture.Register(() => new UnLocode(UnLocodeString())); var departureLoc = fixture.CreateAnonymous<Location>(); var arrivalLoc = fixture.CreateAnonymous<Location>(); var departureDateTime = fixture.CreateAnonymous<DateTime>(); var arrivalDateTime = fixture.CreateAnonymous<DateTime>(); fixture.Register<Location, Location, DateTime, DateTime, CarrierMovement>( (departure, arrival, departureTime, arrivalTime) => new CarrierMovement(departureLoc, arrivalLoc, departureDateTime, arrivalDateTime)); var carrierMovements = fixture.CreateMany<CarrierMovement>(50).ToList(); fixture.Register<List<CarrierMovement>, Schedule>((carrierM) => new Schedule(carrierMovements)); var schedule = fixture.CreateAnonymous<Schedule>(); schedule.ShouldNotBeNull(); } private static string UnLocodeString() { var stringBuilder = new StringBuilder(); for (int i = 0; i < 5; i++) stringBuilder.Append(GetRandomUpperCaseCharacter(i)); return stringBuilder.ToString(); } private static char GetRandomUpperCaseCharacter(int seed) { return ((char)((short)'A' + new Random(seed).Next(26))); } I would like to know if there's better way to refactor it. Would like to do it shorter and easier than that.

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  • How to initialize a web app?

    - by Gatis
    My Web App will be deployed as a WAR package in a Jetty instance. It needs to perform a lot of caching before serving requests. How do I call the caching method before anything else? is the a static void main() in the web app standard?

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  • Can output from OutputDebugString be viewed in VisualStudio's output window

    - by wageoghe
    I am using C# and VS2010. When I use OutputDebugString to write debug information, should it show up in the output window? I can see the output from OutputDebugString in DebugView, but I thought I would see it in Visual Studio's Output window. I have looked under Tools-Options-Debugging-General and the output is NOT being redirected to the Immediate window. I have also looked under Tools-Options-Debugging-Output Window and all General Output Settings are set to "On". Finally, I have used the drop-down list in the Output window to specify that Debug messages should appear. If I change Tools-Options-Debugging-General to redirect the output to the Immediate window, the OutputDebugString messages do not appear in the immediate window. Here is my entire test program: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; using System.Diagnostics; namespace OutputDebugString { class Program { [DllImport("kernel32.dll", CharSet = CharSet.Auto)] public static extern void OutputDebugString(string message); static void Main(string[] args) { Console.WriteLine("Main - Enter - Console.WriteLine"); Debug.WriteLine("Main - Enter - Debug.WriteLine"); OutputDebugString("Main - Enter - OutputDebugString"); OutputDebugString("Main - Exit - OutputDebugString"); Debug.WriteLine("Main - Exit - Debug.WriteLine"); Console.WriteLine("Main - Exit - Console.WriteLine"); } } } If I run within the debugger, the Debug.WriteLine output does show up in the output window, but the OutputDebugString output does not. If I run from a console window, both Debug.WriteLine and OutputDebugString show up in DebugView. Why doesn't the OutputDebugString output ever show up in the output window? Ultimately, my intent is not to write a lot of debug output with OutputDebugString, rather I will use System.Diagnostics or NLog or something similar. I am just trying to find out, if I configure a logging platform to write to OutputDebugString, will the output be visible from within the debugger. Edit: I went back to my original program (not the simple test above) which uses TraceSources and TraceListeners configured via the app.config file. If I configure the trace sources to write to the System.Diagnostics.DefaultTraceListener (which is documented as writing to OutputDebugString), then the trace source output DOES go to the debug window. However, lines that write directly with OutputDebugString (such as in my simple example) DO NOT go to the debug window. Also, if I use a different TraceListener that writes to OutputDebugString (I got one from Ukadc.Diagnostics at codeplex), that output DOES NOT go to the debug window. Note that I have seen these questions but they did not provide a working solution: here and here

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  • Is it allowed to load Swing classes in non-EDT thread?

    - by ddimitrov
    After the introduction of Java Memory Model, the Swing guidelines were changed to state that any Swing components need to be instantiated on the EDT in order to avoid non-published instance state. What I could not find anywhere is whether the classloading is also mandated to be on the EDT or can we pre-load key Swing classes in a background thread? Is there any official statement from Sun/Oracle on this? Are there any classes that are known to hold non-threadsafe static state, hence need to be loaded on EDT?

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  • NullPointerException when generating RSA keys with BouncyCastle

    - by Tom Brito
    public static void main(String[] args) throws Exception { RSAKeyPairGenerator rsaKeyPairGen = new RSAKeyPairGenerator(); AsymmetricCipherKeyPair keyPair = rsaKeyPairGen.generateKeyPair(); } the rsaKeyPairGen is not null, but the generateKeyPair() method is throwing NullPointerException. What may be wrong? Error message: java.lang.NullPointerException at org.bouncycastle.crypto.generators.RSAKeyPairGenerator.generateKeyPair(Unknown Source) at pkg.main(Main.java:154)

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