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• How to use boost::transform_iterator to iterate over modifed std::map values?

  - by Frank

  I have an std::map, and I would like to define an iterator that returns modified values. Typically, a std::map<int,double>::iterator iterates over std::pair<int,double>, and I would like the same behavior, just the double value is multiplied by a constant. I tried it with boost::transform_iterator, but it doesn't compile: #include <map> #include <boost/iterator/transform_iterator.hpp> #include <boost/functional.hpp> typedef std::map<int,double> Map; Map m; m[100] = 2.24; typedef boost::binder2nd< std::multiplies<double> > Function; typedef boost::transform_iterator<Function, Map::value_type*> MultiplyIter; MultiplyIter begin = boost::make_transform_iterator(m.begin(), Function(std::multiplies<double>(), 4)); // now want to similarly create an end iterator // and then iterate over the modified map The error is: error: conversion from 'boost ::transform_iterator< boost::binder2nd<multiplies<double> >, gen_map<int, double>::iterator , boost::use_default, boost::use_default >' to non-scalar type 'boost::transform_iterator< boost::binder2nd<multiplies<double> >, pair<const int, double> * , boost::use_default, boost::use_default >' requested What is gen_map and do I really need it? I adapted the transform_iterator tutorial code from here to write this code ...

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• Invoking code both before and after WebControl.Render method

  - by Dirk

  I have a set of custom ASP.NET server controls, most of which derive from CompositeControl. I want to implement a uniform look for "required" fields across all control types by wrapping each control in a specific piece of HTML/CSS markup. For example: <div class="requiredInputContainer"> ...custom control markup... </div> I'd love to abstract this behavior in such a way as to avoid having to do something ugly like this in every custom control, present and future: public class MyServerControl : TextBox, IRequirableField { public IRequirableField.IsRequired {get;set;} protected override void Render(HtmlTextWriter writer){ RequiredFieldHelper.RenderBeginTag(this, writer) //render custom control markup RequiredFieldHelper.RenderEndTag(this, writer) } } public static class RequiredFieldHelper{ public static void RenderBeginTag(IRequirableField field, HtmlTextWriter writer){ //check field.IsRequired, render based on its values } public static void RenderEndTag(IRequirableField field, HtmlTextWriter writer){ //check field.IsRequired , render based on its values } } If I was deriving all of my custom controls from the same base class, I could conceivably use Template Method to enforce the before/after behavior;but I have several base classes and I'd rather not end up with really a convoluted class hierarchy anyway. It feels like I should be able to design something more elegant (i.e. adheres to DRY and OCP) by leveraging the functional aspects of C#, but I'm drawing a blank.

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• Help! I'm a Haskell Newbie

  - by Darknight

  I've only just dipped my toe in the world of Haskell as part of my journey of programming enlightenment (moving on from, procedural to OOP to concurrent to now functional). I've been trying an online Haskell Evaluator. However I'm now stuck on a problem: Create a simple function that gives the total sum of an array of numbers. In a procedural language this for me is easy enough (using recursion) (c#) : private int sum(ArrayList x, int i) { if (!(x.Count < i + 1)) { int t = 0; t = x.Item(i); t = sum(x, i + 1) + t; return t; } } All very fine however my failed attempt at Haskell was thus: let sum x = x+sum in map sum [1..10] this resulted in the following error (from that above mentioned website): Occurs check: cannot construct the infinite type: a = a -> t Please bear in mind I've only used Haskell for the last 30 minutes! I'm not looking simply for an answer but a more explanation of it. Thanks in advanced.

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• How can I implement a splay tree that performs the zig operation last, not first?

  - by Jakob

  For my Algorithms & Data Structures class, I've been tasked with implementing a splay tree in Haskell. My algorithm for the splay operation is as follows: If the node to be splayed is the root, the unaltered tree is returned. If the node to be splayed is one level from the root, a zig operation is performed and the resulting tree is returned. If the node to be splayed is two or more levels from the root, a zig-zig or zig-zag operation is performed on the result of splaying the subtree starting at that node, and the resulting tree is returned. This is valid according to my teacher. However, the Wikipedia description of a splay tree says the zig step "will be done only as the last step in a splay operation" whereas in my algorithm it is the first step in a splay operation. I want to implement a splay tree that performs the zig operation last instead of first, but I'm not sure how it would best be done. It seems to me that such an algorithm would become more complex, seeing as how one needs to find the node to be splayed before it can be determined whether a zig operation should be performed or not. How can I implement this in Haskell (or some other functional language)?

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• Can you dynamically combine multiple conditional functions into one in Python?

  - by erich

  I'm curious if it's possible to take several conditional functions and create one function that checks them all (e.g. the way a generator takes a procedure for iterating through a series and creates an iterator). The basic usage case would be when you have a large number of conditional parameters (e.g. "max_a", "min_a", "max_b", "min_b", etc.), many of which could be blank. They would all be passed to this "function creating" function, which would then return one function that checked them all. Below is an example of a naive way of doing what I'm asking: def combining_function(max_a, min_a, max_b, min_b, ...): f_array = [] if max_a is not None: f_array.append( lambda x: x.a < max_a ) if min_a is not None: f_array.append( lambda x: x.a > min_a ) ... return lambda x: all( [ f(x) for f in f_array ] ) What I'm wondering is what is the most efficient to achieve what's being done above? It seems like executing a function call for every function in f_array would create a decent amount of overhead, but perhaps I'm engaging in premature/unnecessary optimization. Regardless, I'd be interested to see if anyone else has come across usage cases like this and how they proceeded. Also, if this isn't possible in Python, is it possible in other (perhaps more functional) languages?

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• How can I write simulations in Erlang?

  - by rick

  Hi guys, I want to do some numerical stuff in Erlang like this: You've got an array with the following values: [2,3,4] In each iteration, you calculate 0.1 * [n-1] + 0.7 *[n] + 0.2 * [n+1] This becomes the new [n]. If n == 0 then [n-1] = 0. If [n] == length of array then [n] = 0. So I try an example: [2,3,4] calculations: 0.1 * 0 + 0.7 * 2 + 0.2 * 3 = 2 0.1 * 2 + 0.7 * 3 + 0.2 * 4 = 3.1 0.1 * 3 + 0.7 * 4 + 0.2 * 0 = 3.1 So [2,3,4] becomes to [2, 3.1, 3.1] after one iteration. I know how to write this in a non-functional language like C. But I have difficulties to imagine, how this could be done in Erlang. I found some tutorials on how you read a file to a list. So this is not the problem. How can I spawn different Erlang processes that each process has one element of the list? How can I do calculations by communicating with 'the neighbors', so that the neighbors know where their neigbors are generically, without specifying each? How can I collect the data into a list? Eventually, is it possible to solve that problem in Erlang at all? Thanks for your help.

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• Assign a static function to a variable in PHP

  - by Felipe Almeida

  I would like to assign a static function to a variable so that I can send it around as a parameter. For example: class Foo{ private static function privateStaticFunction($arg1,$arg2){ //compute stuff on the args } public static function publicStaticFunction($foo,$bar){ //works $var = function(){ //do stuff }; //also works $var = function($someArg,$someArg2){ //do stuff }; //Fatal error: Undefined class constant 'privateStaticFunction' $var = self::privateStaticMethod; //same error $var = Foo::privateStaticFunction; //compiles, but errors when I try to run $var() somewhere else, as expected //Fatal error: Call to private method Foo::privateStaticMethod() from context '' $var = function(){ return Foo::privateStaticMethod(); }; } } I've tried a few more variations but none of them worked. I don't even expect this sort of functional hacking to work with PHP but hey, who knows? Is it possible to do that in PHP or will I need to come up with some hack using eval? P.S.: LawnGnome on ##php mentioned something about it being possible to do what I want using array('Foo','privateStaticMethod') but I didn't understand what he meant and I didn't press him further as he looked busy.

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• Trying to run Selenium tests using Hudson - "Error: no display specified"

  - by tputkonen

  I'm trying to get Selenium tests to work when they are executed by Hudson, but I have not been successful so far. Hudson is running on Ubuntu, and Selenium is unable to open display. Command I use for launching the build is: mvn clean selenium:xvfb install error log: [INFO] [selenium:xvfb {execution: default-cli}] [INFO] Starting Xvfb... [INFO] Using display: :20 [INFO] Using Xauthority file: /tmp/Xvfb4467650583214148352.Xauthority Deleting: /tmp/Xvfb4467650583214148352.Xauthority xauth: creating new authority file /tmp/Xvfb4467650583214148352.Xauthority Created dir: /var/lib/hudson/jobs/Selenium/workspace/selenium/target/selenium Launching Xvfb Waiting for Xvfb... [INFO] Redirecting output to: /var/lib/hudson/jobs/Selenium/workspace/selenium/target/selenium/xvfb.log Xvfb started ... [INFO] [selenium:start-server {execution: start}] Launching Selenium Server Waiting for Selenium Server... [INFO] Including display properties from: /var/lib/hudson/jobs/Selenium/workspace/selenium/target/selenium/display.properties [INFO] Redirecting output to: /var/lib/hudson/jobs/Selenium/workspace/selenium/target/selenium/server.log [INFO] User extensions: /var/lib/hudson/jobs/Selenium/workspace/selenium/target/selenium/user-extensions.js Selenium Server started [INFO] [selenium:selenese {execution: run-selenium}] [INFO] Results will go to: /var/lib/hudson/jobs/Selenium/workspace/selenium/target/results-firefox-suite.html ... <~30 seconds pause> ... Error: no display specified ... pom.xml: <groupId>org.codehaus.mojo</groupId> <artifactId>selenium-maven-plugin</artifactId> <version>1.0.1</version> <executions> <execution> <id>start</id> <phase>pre-integration-test</phase> <goals> <goal>start-server</goal> </goals> <configuration> <logOutput>true</logOutput> <background>true</background> <port>5123</port> </configuration> </execution> <execution> <id>run-selenium</id> <phase>integration-test</phase> <goals> <goal>selenese</goal> </goals> </execution> <execution> <id>stop</id> <phase>post-integration-test</phase> <goals> <goal>stop-server</goal> </goals> </execution> </executions> <configuration> <browser>*firefox</browser> <suite>src/test/selenium/suite.html</suite> <startURL>http://localhost:${env.port}</startURL> </configuration> I've also tried to get it working by adding execution for xvfb, but also it failed.

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• Is Debug.Assert obsolete if you write unit tests?

  - by Justin Pihony

  Just like the question asks, is there a need to add Debug.Assert into your code if you are writing unit tests (which has its own assertions)? I could see that this might make the code more obvious without having to go into the tests, however it just seems that you might end up with duplicated asserts. It seems to me that Debug.Assert was helpful before unit-testing became more prevalent, but is now unnecessary. Or, am I not thinking of some use case?

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• Facebook veut analyser les mouvements du curseur sur l'écran, la technologie est déjà en phase de tests

  Facebook veut analyser les mouvements du curseur sur l'écran, la technologie est déjà en phase de tests Ken Rudin, le directeur de l'analyse et de l'exploitation des données pour Facebook, a confié au Wall Street Journal que des tests sont en cours sur de nouvelles techniques d'observation du comportement des usagers. Tout d'abord Facebook a l'intention de traquer les habitudes de ses utilisateurs en suivant à la trace les mouvements du curseur de la souris lors de leurs passages sur le réseau...

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• NetCAT ou le lancement des tests des dernières builds de NetBeans 6.9 : Dernière ligne droite pour l

  NetCAT ou le lancement des tests des dernières build de NetBeans 6.9 Dernière ligne droite pour la nouvelle mouture de NetBeans Depuis le 15 Mars, NetCAT (NetBeans Community Acceptance Testing program), a débuté la série de tests des dernières versions builds de la plateforme NetBeans. Ainsi, une cinquantaine de membres ayant demandé leur intégration au projet vont tester et émettre des retours d'expérience afin d'améliorer le maximum de points dans l'objectif d'obtenir une version finale stable et sans bugs. Le programme va se dérouler pendant 3 mois autour des milestones de l'IDE Voici le planning prévu : [IMG]http://www.livesphere.fr/images/dvp/netc...

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• A TDD Journey: 4-Tests as Documentation; False Positive Results; Component Isolation

  In Test-Driven Development (TDD) , The writing of a unit test is done more to design and to document than to verifiy. By writing a unit test you close a number of feedback loops, and verifying the functionality of the code is just a minor one. everything you need to know about your class under test is embodied in a simple list of the names of the tests. Michael Sorens continues his introduction to TDD that is more of a journey in six parts, by discussing Tests as Documentation, False Positive Results and Component Isolation.

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• J: Self-reference in bubble sort tacit implementation

  - by Yasir Arsanukaev

  Hello people! Since I'm beginner in J I've decided to solve a simple task using this language, in particular implementing the bubblesort algorithm. I know it's not idiomatically to solve such kind of problem in functional languages, because it's naturally solved using array element transposition in imperative languages like C, rather than constructing modified list in declarative languages. However this is the code I've written: (((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # Let's apply it to an array: (((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # 5 3 8 7 2 2 3 5 7 8 The thing that confuses me is $: referring to the statement within the outermost parentheses. Help says that: $: denotes the longest verb that contains it. The other book (~ 300 KiB) says: 3+4 7 5*20 100 Symbols like + and * for plus and times in the above phrases are called verbs and represent functions. You may have more than one verb in a J phrase, in which case it is constructed like a sentence in simple English by reading from left to right, that is 4+6%2 means 4 added to whatever follows, namely 6 divided by 2. Let's rewrite my code snippet omitting outermost ()s: ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) ^: # 5 3 8 7 2 2 3 5 7 8 Reuslts are the same. I couldn't explain myself why this works, why only ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) is treated as the longest verb for $: but not the whole expression ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) ^: # and not just (<./@(2&{.)), $:@((>./@(2&{.)),2&}.), because if ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) is a verb, it should also form another verb after conjunction with #, i. e. one might treat the whole sentence (first snippet) as a verb. Probably there's some limit for the verb length limited by one conjunction. Look at the following code (from here): factorial =: (* factorial@<:) ^: (1&<) factorial 4 24 factorial within expression refers to the whole function, i. e. (* factorial@<:) ^: (1&<). Following this example I've used a function name instead of $:: bubblesort =: (((<./@(2&{.)), bubblesort@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # bubblesort 5 3 8 7 2 2 3 5 7 8 I expected bubblesort to refer to the whole function, but it doesn't seem true for me since the result is correct. Also I'd like to see other implementations if you have ones, even slightly refactored. Thanks.

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• Java - is this an idiom or pattern, behavior classes with no state

  - by Berlin Brown

  I am trying to incorporate more functional programming idioms into my java development. One pattern that I like the most and avoids side effects is building classes that have behavior but they don't necessarily have any state. The behavior is locked into the methods but they only act on the parameters passed in. The code below is code I am trying to avoid: public class BadObject { private Map<String, String> data = new HashMap<String, String>(); public BadObject() { data.put("data", "data"); } /** * Act on the data class. But this is bad because we can't * rely on the integrity of the object's state. */ public void execute() { data.get("data").toString(); } } The code below is nothing special but I am acting on the parameters and state is contained within that class. We still may run into issues with this class but that is an issue with the method and the state of the data, we can address issues in the routine as opposed to not trusting the entire object. Is this some form of idiom? Is this similar to any pattern that you use? public class SemiStatefulOOP { /** * Private class implies that I can access the members of the <code>Data</code> class * within the <code>SemiStatefulOOP</code> class and I can also access * the getData method from some other class. * * @see Test1 * */ class Data { protected int counter = 0; public int getData() { return counter; } public String toString() { return Integer.toString(counter); } } /** * Act on the data class. */ public void execute(final Data data) { data.counter++; } /** * Act on the data class. */ public void updateStateWithCallToService(final Data data) { data.counter++; } /** * Similar to CLOS (Common Lisp Object System) make instance. */ public Data makeInstance() { return new Data(); } } // End of Class // Issues with the code above: I wanted to declare the Data class private, but then I can't really reference it outside of the class: I can't override the SemiStateful class and access the private members. Usage: final SemiStatefulOOP someObject = new SemiStatefulOOP(); final SemiStatefulOOP.Data data = someObject.makeInstance(); someObject.execute(data); someObject.updateStateWithCallToService(data);

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• "Exception has been thrown by the target of an invocation" Running Tests - VS2008 SP1

  - by omatrot

  I'm using Visual Studio 2008 Team Suite and I'm unable to run tests and display the Test/Windows/Test Result Window. The result is a dialog box with the following content : "Exception has been thrown by the target of an invocation". Team Explorer has been installed after Visual Studio 2008 SP1. So I have re-apllied the service pack. Searching the web I found that this error is pretty common but unfortunately, the proposed solutions does not work for me. The problem was never analysed so I decided to give it a try : I reproduced the problem on a computer, attached the process with windbg and start with the basic investigations. Following are the first results : 0:000>!dumpstack OS Thread Id: 0xdb0 (0) Current frame: USER32!NtUserWaitMessage+0x15 ChildEBP RetAddr Caller,Callee 003fec94 75a32674 USER32!DialogBox2+0x222, calling USER32!NtUserWaitMessage 003fecd0 75a3288a USER32!InternalDialogBox+0xe5, calling USER32!DialogBox2 003fecfc 75a6f8d0 USER32!SoftModalMessageBox+0x757, calling USER32!InternalDialogBox 003fed3c 6eb61996 mscorwks!Thread::ReverseLeaveRuntime+0x95, calling mscorwks!_EH_epilog3 003fedb0 75a6fbac USER32!MessageBoxWorker+0x269, calling USER32!SoftModalMessageBox 003fede0 6ea559c3 mscorwks!SetupThreadNoThrow+0x19a, calling mscorwks!_EH_epilog3_catch_GS 003fee24 6eb61d8a mscorwks!HasIllegalReentrancy+0xac, calling mscorwks!_EH_epilog3 003fee30 6ea89796 mscorwks!SimpleComCallWrapper::Release+0x2e, calling mscorwks!CompareExchangeMP 003fee38 6ea0da05 mscorwks!CLRException::HandlerState::CleanupTry+0x16, calling mscorwks!GetCurrentSEHRecord 003fee44 6ea0c9c0 mscorwks!Thread::EnablePreemptiveGC+0xf, calling mscorwks!Thread::CatchAtSafePoint 003fee4c 6ea8a241 mscorwks!Unknown_Release_Internal+0x24d, calling mscorwks!GCHolder<1,0,0>::Pop 003fee50 6ea0c86c mscorwks!_EH_epilog3_catch_GS+0xa, calling mscorwks!__security_check_cookie 003fee54 6ea8a24c mscorwks!Unknown_Release_Internal+0x258, calling mscorwks!_EH_epilog3_catch_GS 003fee7c 75a16941 USER32!UserCallWinProcCheckWow+0x13d, calling ntdll!RtlDeactivateActivationContextUnsafeFast 003feed8 7082119e msenv!ATL::CComCritSecLock<ATL::CComCriticalSection>::Lock+0xd, calling ntdll!RtlEnterCriticalSection 003fef08 75a6fe5b USER32!MessageBoxIndirectW+0x2e, calling USER32!MessageBoxWorker 003fef7c 70a1e367 msenv!MessageBoxPVoidW+0xda 003fefd4 70a1db60 msenv!VBDialogCover2+0x11b 003ff01c 70a1e4c0 msenv!VBMessageBox2W+0xf0, calling msenv!VBDialogCover2 003ff044 7087246b msenv!main_GetAppNameW+0xa, calling msenv!GetAppNameInternal 003ff04c 70a1e4f2 msenv!VBMessageBox3W+0x1c, calling msenv!VBMessageBox2W 003ff064 70a1d6d7 msenv!_IdMsgShow+0x362, calling msenv!VBMessageBox3W 003ff0cc 70951841 msenv!TaskDialogCallback+0x7e0, calling msenv!_IdMsgShow 003ff118 6eb20da4 mscorwks!Unknown_QueryInterface+0x230, calling mscorwks!_EH_epilog3_catch_GS 003ff14c 6eb20c43 mscorwks!Unknown_QueryInterface_Internal+0x3d8, calling mscorwks!_EH_epilog3_catch_GS 003ff168 02006ec4 02006ec4, calling 0247a1e8 003ff16c 6ea0c86c mscorwks!_EH_epilog3_catch_GS+0xa, calling mscorwks!__security_check_cookie 003ff198 6eb20562 mscorwks!COMToCLRWorker+0xb34, calling mscorwks!_EH_epilog3_catch_GS 003ff19c 0247a235 0247a235, calling mscorwks!COMToCLRWorker 003ff1c4 7083249f msenv!CVSCommandTarget::ExecCmd+0x937 003ff1e4 7086d5c8 msenv!VsReportErrorInfo+0x11, calling msenv!TaskDialogCallback+0xd8 003ff1f8 7093e65b msenv!CVSCommandTarget::ExecCmd+0x945, calling msenv!VsReportErrorInfo 003ff25c 7081f53a msenv!ATL::CComPtr<IVsLanguageInfo>::~CComPtr<IVsLanguageInfo>+0x24, calling msenv!_EH_epilog3 003ff260 70b18d72 msenv!LogCommand+0x4c, calling msenv!ATL::CComPtr<IVsCodePageSelection>::~CComPtr<IVsCodePageSelection> 003ff264 70b18d77 msenv!LogCommand+0x51, calling msenv!_EH_epilog3 003ff280 70a4fd0e msenv!CMsoButtonUser::FClick+0x1d1, calling msenv!CVSCommandTarget::ExecCmd 003ff2f4 70823a87 msenv!CTLSITE::QueryInterface+0x16 003ff31c 70cb7d4d msenv!TBCB::FNotifyFocus+0x204 003ff35c 70ce5fda msenv!TB::NotifyControl+0x101 003ff3bc 709910f6 msenv!TB::FRequestFocus+0x4ed, calling msenv!TB::NotifyControl 003ff414 708254ba msenv!CMsoButtonUser::FEnabled+0x3d, calling msenv!GetQueryStatusFlags 003ff428 7086222a msenv!TBC::FAutoEnabled+0x24 003ff43c 7098e1eb msenv!TB::LProcessInputMsg+0xdb4 003ff458 6bec1c49 (MethodDesc 0x6bcd7f54 +0x89 System.Windows.Forms.Form.DefWndProc(System.Windows.Forms.Message ByRef)), calling 6be3b738 003ff50c 70823ab0 msenv!FPtbFromSite+0x16 003ff520 70991c43 msenv!TB::PtbParent+0x25, calling msenv!FPtbFromSite 003ff52c 708dda49 msenv!TBWndProc+0x2da 003ff588 0203d770 0203d770, calling 0247a1e8 003ff598 70822a70 msenv!CPaneFrame::Release+0x118, calling msenv!_EH_epilog3 003ff5b0 75a16238 USER32!InternalCallWinProc+0x23 003ff5dc 75a168ea USER32!UserCallWinProcCheckWow+0x109, calling USER32!InternalCallWinProc 003ff620 75a16899 USER32!UserCallWinProcCheckWow+0x6a, calling ntdll!RtlActivateActivationContextUnsafeFast 003ff654 75a17d31 USER32!DispatchMessageWorker+0x3bc, calling USER32!UserCallWinProcCheckWow 003ff688 70847f2b msenv!CMsoComponent::FPreTranslateMessage+0x72, calling msenv!MainFTranslateMessage 003ff6b4 75a17dfa USER32!DispatchMessageW+0xf, calling USER32!DispatchMessageWorker 003ff6c4 70831553 msenv!EnvironmentMsgLoop+0x1ea, calling USER32!DispatchMessageW 003ff6f8 708eb9bd msenv!CMsoCMHandler::FPushMessageLoop+0x86, calling msenv!EnvironmentMsgLoop 003ff724 708eb94d msenv!SCM::FPushMessageLoop+0xb7 003ff74c 708eb8e9 msenv!SCM_MsoCompMgr::FPushMessageLoop+0x28, calling msenv!SCM::FPushMessageLoop 003ff768 708eb8b8 msenv!CMsoComponent::PushMsgLoop+0x28 003ff788 708ebe4e msenv!VStudioMainLogged+0x482, calling msenv!CMsoComponent::PushMsgLoop 003ff7ac 70882afe msenv!CVsActivityLogSingleton::Instance+0xdf, calling msenv!_EH_epilog3 003ff7d8 70882afe msenv!CVsActivityLogSingleton::Instance+0xdf, calling msenv!_EH_epilog3 003ff7dc 707e4e31 msenv!VActivityLogStartupEntries+0x42 003ff7f4 7081f63b msenv!ATL::CComPtr<IClassFactory>::~CComPtr<IClassFactory>+0x24, calling msenv!_EH_epilog3 003ff7f8 708b250f msenv!ATL::CComQIPtr<IUnknown,&IID_IUnknown>::~CComQIPtr<IUnknown,&IID_IUnknown>+0x1d, calling msenv!_EH_epilog3 003ff820 708e7561 msenv!VStudioMain+0xc1, calling msenv!VStudioMainLogged 003ff84c 2f32aabc devenv!util_CallVsMain+0xff 003ff878 2f3278f2 devenv!CDevEnvAppId::Run+0x11fd, calling devenv!util_CallVsMain 003ff97c 77533b23 ntdll!RtlpAllocateHeap+0xe73, calling ntdll!_SEH_epilog4 003ff9f0 77536cd7 ntdll!RtlpLowFragHeapAllocFromContext+0x882, calling ntdll!RtlpSubSegmentInitialize 003ffa10 7753609f ntdll!RtlNtStatusToDosError+0x3b, calling ntdll!RtlNtStatusToDosErrorNoTeb 003ffa14 775360a4 ntdll!RtlNtStatusToDosError+0x40, calling ntdll!_SEH_epilog4 003ffa40 775360a4 ntdll!RtlNtStatusToDosError+0x40, calling ntdll!_SEH_epilog4 003ffa44 75bd2736 kernel32!LocalBaseRegOpenKey+0x159, calling ntdll!RtlNtStatusToDosError 003ffa48 75bd2762 kernel32!LocalBaseRegOpenKey+0x22a, calling kernel32!_SEH_epilog4 003ffac4 75bd2762 kernel32!LocalBaseRegOpenKey+0x22a, calling kernel32!_SEH_epilog4 003ffac8 75bd28c9 kernel32!RegOpenKeyExInternalW+0x130, calling kernel32!LocalBaseRegOpenKey 003ffad8 75bd28de kernel32!RegOpenKeyExInternalW+0x211 003ffae0 75bd28e5 kernel32!RegOpenKeyExInternalW+0x21d, calling kernel32!_SEH_epilog4 003ffb04 6f282e2b MSVCR90!_unlock+0x15, calling ntdll!RtlLeaveCriticalSection 003ffb14 75bd2642 kernel32!BaseRegCloseKeyInternal+0x41, calling ntdll!NtClose 003ffb28 75bd25d0 kernel32!RegCloseKey+0xd4, calling kernel32!_SEH_epilog4 003ffb5c 75bd25d0 kernel32!RegCloseKey+0xd4, calling kernel32!_SEH_epilog4 003ffb60 2f321ea4 devenv!DwInitSyncObjects+0x340 003ffb90 2f327bf4 devenv!WinMain+0x74, calling devenv!CDevEnvAppId::Run 003ffbac 2f327c68 devenv!License::GetPID+0x258, calling devenv!WinMain 003ffc3c 75bd3677 kernel32!BaseThreadInitThunk+0xe 003ffc48 77539d72 ntdll!__RtlUserThreadStart+0x70 003ffc88 77539d45 ntdll!_RtlUserThreadStart+0x1b, calling ntdll!__RtlUserThreadStart 0:000> !pe -nested Exception object: 050aae9c Exception type: System.Reflection.TargetInvocationException Message: Exception has been thrown by the target of an invocation. InnerException: System.NullReferenceException, use !PrintException 050aac64 to see more StackTrace (generated): SP IP Function 003FEC2C 6D2700F7 mscorlib_ni!System.RuntimeType.CreateInstanceSlow(Boolean, Boolean)+0x57 003FEC5C 6D270067 mscorlib_ni!System.RuntimeType.CreateInstanceImpl(Boolean, Boolean, Boolean)+0xe7 003FEC94 6D270264 mscorlib_ni!System.Activator.CreateInstance(System.Type, Boolean)+0x44 003FECA4 6AD02DAF Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.CreateToolWindow(System.Type, Int32, Microsoft.VisualStudio.Shell.ProvideToolWindowAttribute)+0x67 003FED30 6AD0311B Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.CreateToolWindow(System.Type, Int32)+0xb7 003FED58 6AD02D12 Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.FindToolWindow(System.Type, Int32, Boolean, Microsoft.VisualStudio.Shell.ProvideToolWindowAttribute)+0x7a 003FED88 6AD02D39 Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.FindToolWindow(System.Type, Int32, Boolean)+0x11 003FED94 02585E30 Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.InitToolWindowVariable[[System.__Canon, mscorlib]](System.__Canon ByRef, System.String, Boolean)+0x58 003FEDD0 02585DBE Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.InitToolWindowVariable[[System.__Canon, mscorlib]](System.__Canon ByRef, System.String)+0x36 003FEDE4 02585D32 Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.ShowToolWindow[[System.__Canon, mscorlib]](System.__Canon ByRef, System.String, Boolean)+0x3a 003FEE00 02585AB4 Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.OpenTestResultsToolWindow()+0x2c 003FEE10 02585A6E Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.OnMenuViewTestResults(System.Object, System.EventArgs)+0x6 003FEE18 6CD4F993 System_ni!System.ComponentModel.Design.MenuCommand.Invoke()+0x43 003FEE40 6CD4F9D4 System_ni!System.ComponentModel.Design.MenuCommand.Invoke(System.Object)+0x8 003FEE48 6AD000FA Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.OleMenuCommandService.Microsoft.VisualStudio.OLE.Interop.IOleCommandTarget.Exec(System.Guid ByRef, UInt32, UInt32, IntPtr, IntPtr)+0x11a 003FEEA0 6AD03FB8 Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.OLE.Interop.IOleCommandTarget.Exec(System.Guid ByRef, UInt32, UInt32, IntPtr, IntPtr)+0x44 StackTraceString: <none> HResult: 80131604 0:000> !PrintException 050aac64 Exception object: 050aac64 Exception type: System.NullReferenceException Message: Object reference not set to an instance of an object. InnerException: <none> StackTrace (generated): SP IP Function 003FE660 078E60BE Microsoft_VisualStudio_TeamSystem_Integration!Microsoft.VisualStudio.TeamSystem.Integration.TcmResultsPublishManager..ctor(Microsoft.VisualStudio.TeamSystem.Integration.ResultsPublishManager)+0xc6 003FE674 078E5C91 Microsoft_VisualStudio_TeamSystem_Integration!Microsoft.VisualStudio.TeamSystem.Integration.ResultsPublishManager..ctor(Microsoft.VisualStudio.TeamSystem.Integration.TeamFoundationHostHelper)+0x59 003FE684 078E2FA0 Microsoft_VisualStudio_TeamSystem_Integration!Microsoft.VisualStudio.TeamSystem.Integration.VsetServerHelper..ctor(System.IServiceProvider)+0x50 003FE6A4 078E2E90 Microsoft_VisualStudio_TeamSystem_Common!Microsoft.VisualStudio.TeamSystem.Integration.Client.VsetHelper.InitializeThrow(System.IServiceProvider)+0x20 003FE6B8 078E2E2A Microsoft_VisualStudio_TeamSystem_Common!Microsoft.VisualStudio.TeamSystem.Integration.Client.VsetHelper.InitializeHelper(System.IServiceProvider)+0x22 003FE6E0 078E2DEC Microsoft_VisualStudio_TeamSystem_Common!Microsoft.VisualStudio.TeamSystem.Integration.Client.VsetHelper.CreateVsetHelper(System.IServiceProvider)+0x1c 003FE6F0 078E2DAC Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.get_VsetHelper()+0x14 003FE6F8 02586BBE Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.ResultsToolWindow..ctor()+0x9f6 003FE798 02585F8A Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.ResultToolWindowHost..ctor()+0x1a StackTraceString: <none> HResult: 80004003 In order to be able to continue the analysis, we need to get the parameters to see what is going on. I also tried to run devenv.exe with the /log switch. No error in the log after reproducing the problem. Finally, If Team Explorer is removed from the system, the problem goes away. Any help appreciated. TIA. Olivier.

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• rake test:units fails with status ()

  - by ander163

  New user, haven't been building tests as I go, so I'm an idiot. The application is running, but the tests fail. Here is what appears to be relevant: .... ** Execute test:units /usr/local/bin/ruby -I"lib:test" "/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb" "test/unit/event_test.rb" "test/unit/helpers/calendar1_helper_test.rb" "test/unit/helpers/events_helper_test.rb" "test/unit/helpers/homepage_helper_test.rb" "test/unit/helpers/main_helper_test.rb" "test/unit/helpers/mobile_helper_test.rb" "test/unit/helpers/notes_helper_test.rb" "test/unit/helpers/password_resets_helper_test.rb" "test/unit/helpers/projects_helper_test.rb" "test/unit/helpers/search_helper_test.rb" "test/unit/helpers/start_helper_test.rb" "test/unit/helpers/superadmin_helper_test.rb" "test/unit/helpers/tasks_helper_test.rb" "test/unit/helpers/user_sessions_helper_test.rb" "test/unit/helpers/users_helper_test.rb" "test/unit/note_test.rb" "test/unit/notifier_test.rb" "test/unit/project_test.rb" "test/unit/task_test.rb" "test/unit/user_session_test.rb" "test/unit/user_test.rb" /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:119:Warning: Gem::Dependency#version_requirements is deprecated and will be removed on or after August 2010. Use #requirement /usr/lib/ruby/gems/1.8/gems/hpricot-0.6.164/lib/universal-java1.6/fast_xs.bundle: [BUG] Segmentation fault ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin10.2.0] rake aborted! Command failed with status (): [/usr/local/bin/ruby -I"lib:test" "/usr/loc...] /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:995:in sh' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1010:incall'

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• JUnit confusion: use 'extend Testcase' or '@Test' ?

  - by Rabarberski

  I've found the proper use (or at least the documentation) of JUnit very confusing. This question serves both as a future reference and as a real question. If I've understood correctly, there are two main approaches to create and run a JUnit test: Approach A: create a class that extends TestCase, and start test methods with the word test. When running the class as a JUnit Test (in Eclipse), all methods starting with the word test are automatically run. import junit.framework.TestCase; public class DummyTestA extends TestCase { public void testSum() { int a = 5; int b = 10; int result = a + b; assertEquals(15, result); } } Approach B: create a 'normal' class and prepend a @Test annotation to the method. Note that you do NOT have to start the method with the word test. import org.junit.*; import static org.junit.Assert.*; public class DummyTestB { @Test public void Sum() { int a = 5; int b = 10; int result = a + b; assertEquals(15, result); } } Mixing the two seems not to be a good idea, see e.g. this stackoverflow question: Now, my questions(s): What is the preferred approach, or when would you use one instead of the other? Approach B allows for testing for exceptions by extending the @Test annotation like in @Test(expected = ArithmeticException.class). But how do you test for exceptions when using approach A? When using approach A, you can group a number of test classes in a test suite. TestSuite suite = new TestSuite("All tests");<br/> suite.addTestSuite(DummyTestA.class); suite.addTestSuite(DummyTestAbis.class);` But this can't be used with approach B (since each testclass should subclass TestCase). What is the proper way to group tests for approach B?

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• Simple XNA 2D demo: why is my F# version slower than C# version?

  - by Den

  When running this XNA application it should display a rotated rectangle that moves from top-left corner to bottom-right corner. It looks like my F# version is noticeably much slower. It seems that the Draw method skips a lot of frames. I am using VS 2012 RC, XNA 4.0, .NET 4.5, F# 3.0. I am trying to make it as functional as possible. What could be the reason for poor performance? C#: class Program { static void Main(string[] args) { using (var game = new FlockGame()) { game.Run(); } } } public class FlockGame : Game { private GraphicsDeviceManager graphics; private DrawingManager drawingManager; private Vector2 position = Vector2.Zero; public FlockGame() { graphics = new GraphicsDeviceManager(this); } protected override void Initialize() { drawingManager = new DrawingManager(graphics.GraphicsDevice); this.IsFixedTimeStep = false; } protected override void Update(GameTime gameTime) { position = new Vector2(position.X + 50.1f * (float)gameTime.ElapsedGameTime.TotalSeconds, position.Y + 50.1f * (float)gameTime.ElapsedGameTime.TotalSeconds); base.Update(gameTime); } protected override void Draw(GameTime gameTime) { //this.GraphicsDevice.Clear(Color.Lavender) drawingManager.DrawRectangle(position, new Vector2(100.0f, 100.0f), 0.7845f, Color.Red); base.Draw(gameTime); } } public class DrawingManager { private GraphicsDevice GraphicsDevice; private Effect Effect; public DrawingManager(GraphicsDevice graphicsDevice) { GraphicsDevice = graphicsDevice; this.Effect = new BasicEffect(this.GraphicsDevice) { VertexColorEnabled = true, Projection = Matrix.CreateOrthographicOffCenter(0.0f, this.GraphicsDevice.Viewport.Width, this.GraphicsDevice.Viewport.Height, 0.0f, 0.0f, 1.0f) }; } private VertexPositionColor[] GetRectangleVertices (Vector2 center, Vector2 size, float radians, Color color) { var halfSize = size/2.0f; var topLeft = -halfSize; var bottomRight = halfSize; var topRight = new Vector2(bottomRight.X, topLeft.Y); var bottomLeft = new Vector2(topLeft.X, bottomRight.Y); topLeft = Vector2.Transform(topLeft, Matrix.CreateRotationZ(radians)) + center; topRight = Vector2.Transform(topRight, Matrix.CreateRotationZ(radians)) + center; bottomRight = Vector2.Transform(bottomRight, Matrix.CreateRotationZ(radians)) + center; bottomLeft = Vector2.Transform(bottomLeft, Matrix.CreateRotationZ(radians)) + center; return new VertexPositionColor[] { new VertexPositionColor(new Vector3(topLeft, 0.0f), color), new VertexPositionColor(new Vector3(topRight, 0.0f), color), new VertexPositionColor(new Vector3(topRight, 0.0f), color), new VertexPositionColor(new Vector3(bottomRight, 0.0f), color), new VertexPositionColor(new Vector3(bottomRight, 0.0f), color), new VertexPositionColor(new Vector3(bottomLeft, 0.0f), color), new VertexPositionColor(new Vector3(bottomLeft, 0.0f), color), new VertexPositionColor(new Vector3(topLeft, 0.0f), color) }; } public void DrawRectangle(Vector2 center, Vector2 size, float radians, Color color) { var vertices = GetRectangleVertices(center, size, radians, color); foreach (var pass in this.Effect.CurrentTechnique.Passes) { pass.Apply(); this.GraphicsDevice.DrawUserPrimitives(PrimitiveType.LineList, vertices, 0, vertices.Length/2); } } } F#: namespace Flocking module FlockingProgram = open System open Flocking [<STAThread>] [<EntryPoint>] let Main _ = use g = new FlockGame() g.Run() 0 //------------------------------------------------------------------------------ namespace Flocking open System open System.Diagnostics open Microsoft.Xna.Framework open Microsoft.Xna.Framework.Graphics open Microsoft.Xna.Framework.Input type public FlockGame() as this = inherit Game() let mutable graphics = new GraphicsDeviceManager(this) let mutable drawingManager = null let mutable position = Vector2.Zero override Game.LoadContent() = drawingManager <- new Rendering.DrawingManager(graphics.GraphicsDevice) this.IsFixedTimeStep <- false override Game.Update gameTime = position <- Vector2(position.X + 50.1f * float32 gameTime.ElapsedGameTime.TotalSeconds, position.Y + 50.1f * float32 gameTime.ElapsedGameTime.TotalSeconds) base.Update gameTime override Game.Draw gameTime = //this.GraphicsDevice.Clear(Color.Lavender) Rendering.DrawRectangle(drawingManager, position, Vector2(100.0f, 100.0f), 0.7845f, Color.Red) base.Draw gameTime //------------------------------------------------------------------------------ namespace Flocking open System open System.Collections.Generic open Microsoft.Xna.Framework open Microsoft.Xna.Framework.Graphics open Microsoft.Xna.Framework.Input module Rendering = [<AllowNullLiteral>] type DrawingManager (graphicsDevice : GraphicsDevice) = member this.GraphicsDevice = graphicsDevice member this.Effect = new BasicEffect(this.GraphicsDevice, VertexColorEnabled = true, Projection = Matrix.CreateOrthographicOffCenter(0.0f, float32 this.GraphicsDevice.Viewport.Width, float32 this.GraphicsDevice.Viewport.Height, 0.0f, 0.0f, 1.0f)) let private GetRectangleVertices (center:Vector2, size:Vector2, radians:float32, color:Color) = let halfSize = size / 2.0f let mutable topLeft = -halfSize let mutable bottomRight = halfSize let mutable topRight = new Vector2(bottomRight.X, topLeft.Y) let mutable bottomLeft = new Vector2(topLeft.X, bottomRight.Y) topLeft <- Vector2.Transform(topLeft, Matrix.CreateRotationZ(radians)) + center topRight <- Vector2.Transform(topRight, Matrix.CreateRotationZ(radians)) + center bottomRight <- Vector2.Transform(bottomRight, Matrix.CreateRotationZ(radians)) + center bottomLeft <- Vector2.Transform(bottomLeft, Matrix.CreateRotationZ(radians)) + center [| new VertexPositionColor(new Vector3(topLeft, 0.0f), color) new VertexPositionColor(new Vector3(topRight, 0.0f), color) new VertexPositionColor(new Vector3(topRight, 0.0f), color) new VertexPositionColor(new Vector3(bottomRight, 0.0f), color) new VertexPositionColor(new Vector3(bottomRight, 0.0f), color) new VertexPositionColor(new Vector3(bottomLeft, 0.0f), color) new VertexPositionColor(new Vector3(bottomLeft, 0.0f), color) new VertexPositionColor(new Vector3(topLeft, 0.0f), color) |] let DrawRectangle (drawingManager:DrawingManager, center:Vector2, size:Vector2, radians:float32, color:Color) = let vertices = GetRectangleVertices(center, size, radians, color) for pass in drawingManager.Effect.CurrentTechnique.Passes do pass.Apply() drawingManager.GraphicsDevice.DrawUserPrimitives(PrimitiveType.LineList, vertices, 0, vertices.Length/2)

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• How do I configure integration tests using rspec 2?

  - by Jamie Monserrate

  I need to have different settings for my unit tests and different settings for my integration tests. Example For unit tests, I would like to do WebMock.disable_net_connect!(:allow_localhost => true) And for integration tests, I would like to do WebMock.allow_net_connect! Also, before the start of an integration test, I would like to make sure that solr is started. Hence I want to be able to call config.before(:suite) do SunspotStarter.start end BUT, only for integration tests. I do not want to start my solr if its a unit test. How do I keep their configurations separate? Right now, I have solved this by keeping my integration tests in a folder outside the spec folder, which has its own spec_helper. Is there any better way?

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• WatiN or Selenium?

  - by David Thomas Garcia

  I'm going to start building some automated tests of our presentation soon. It seems that everyone recommends WatiN and Selenium. Which do you prefer for automated testing of ASP.NET web forms? Why did that product work better for you? As a side note, I noticed that WatiN 2.0 has been in CTP since March 2008, is that something to be concerned about?

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• how to test Asp.Net frontend?

  - by Fabiano

  Hi Does someone know a good way to automate the gui testing based on an Asp.Net frontend? (instead of always run the pages and test the inputs and outputs of a control by hand) Are there any references or framework to support these tests? Thanks

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• Test Automation

  - by Hahnemann

  We are moving to TSF 2008 and I am wondering if there is something in TFS 2008 that will automate test cases. I was looking into Test Automation FX for recording tests from our in-house built UI that we want to test. Any other recommendations? Thanks.

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• Is LUA a language that a non-developer can learn quickly?

  - by Brian T Hannan

  Let's say a tester is to do some programming to create automated tests ... is LUA really easy to learn for someone who is not a developer?

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• Web Application Testing for .Net (WatiN Test Recorder)

  - by Mac

  I've been using WatiN as a testing tool for my current project. Besides the minor bugs with the Test Recorder, I've been able to use it and automate a lot of my tests in conjunction with NUnit. Anyone else out there with experience with different tools they might suggest?

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• UI Testing Tool on linux

  - by Hulk

  Looking for a tool to UI testing on Linux .Platform used for development is django. The idea is that the analysts will capture the tests thru some UI and it will be able to be played back over and over again.

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