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• What processor is javax.xml.transform Using?

  - by Jeremy Witmer

  I've implented a simple webapp that transforms XML based on an XSTL stylesheet. It works fine on all the Windows servers I've deployed it on (to Tomcat), but on all Linux systems, I get a compile error on the XSLT. As best I can tell, it's because Java 1.6 isn't using the same processor behind javax.xml.transform. On the one Linux system, it's org.apache.xalan.xslt, version 2.4. What I can't figure out is how to generically figure out what any given system is using behind javax.xml.transform. Or, if anyone has any hints on what else I might do to figure out the problem, that'd be good, too.

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• Implementing callback functions in C

  - by robertjohn123

  Hi, I am a newbie to C.I am trying to implement callback function using function pointers. I am getting an error :test_callback.c:10: error: expected identifier or ‘(’ before ‘void’ when I try to compile the following program: #include<stdio.h> void (*callback) (void); void callback_proc () { printf ("Inside callback funtion\n"); } void register ((void (*callback) (void))) { printf ("Inside registration \n"); callback (); /* Calling an initial callback with function pointer */ } int main () { callback = callback_proc;/* Assigning function to the function pointer */ register (callback);/* Passing the function pointer */ return 0; } What is this error?Can anyone help?

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• Error in my OO Generics design. How do I workaround it?

  - by John

  I get "E2511 Type parameter 'T' must be a class type" on the third class. type TSomeClass=class end; ParentParentClass<T>=class end; ParentClass<T: class> = class(ParentParentClass<T>) end; ChildClass<T: TSomeClass> = class(ParentClass<T>) end; I'm trying to write a lite Generic Array wrapper for any data type(ParentParentClass) ,but because I'm unable to free type idenitifiers( if T is TObject then Tobject(T).Free) , I created the second class, which is useful for class types, so I can free the objects. The third class is where I use my wrapper, but the compiler throws that error. How do I make it compile?

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• d2: strange lowering of protection and possible misbehavior in static imports

  - by modchan

  Consider there is moda.d: module moda; private struct modb {}; And modb.d: module modb; private import moda; And modmain.d: module modmain; static import moda; static import modb; void main() { modb v; // should NOT compile, should it? } I don't know why, but moda.modb is visible in both modmain and modb, while, as far as I understand, it should not - both due to moda being imported as static and moda.modb being private. Or should? Have I run into dmd bug or it's planned behaviour I hadn't understood?

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• Cannot access implict object from within method in custom JSP tag file

  - by David Hamilton

  I'm attempting to create a custom jsp tag. Everything is working fine, except for the fact that I the request seems to be out-of-scope for my custom function. Here is the relevant bit from the .tag file: <%! private String process(String age, BigDecimal amount) { //Attempting to access request here results in an compile time error trying to: String url=request.getURL; } %> I'm very new to JSP so I'm sure I'm missing something obvious..but I can't seem to figure out what. Any help is appreciated.

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• GWT on Python App Engine

  - by Koran

  Hi, I have a python app engine code (matured backend) - and we are now planning to have a front end for that code. I was wondering whether it is possible to implement GWT as the front end. Even though Alex Martelli in this post [1] mentions it is not possible, a comment to that post suggests that it is indeed possible using rpc over json for GWT. I was unable to understand how this is possible. In app.yaml file, we have to specify the language to be python, right? In that case, how can it compile GWT based on JAVA? Are there any examples on anyone doing that? Can someone help me out? It would be extremely helpful. [1]: http://stackoverflow.com/questions/1085898/choosing-java-vs-python-on-google-app-engine/1087878#1087878 link

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• Monodevelop: "Are you missing an assembly reference?" despite reference being added

  - by Nicolas Raoul

  I have a solution with 3 projects. Two of the projects compile fine: SparkleLib and SparkleLib.Cmis The third project (SparkleShare) depends on the two above, so I added them as references, but I get: The type or namespace name 'Cmis' does not exist in the namespace 'SparkleLib'. Are you missing an assembly reference? The error indicates that I should add SparkleLib.Cmis as a reference, but I already added it... I tried deleteting, re-adding, restarting, but no success. It is not a problem with my environment, as my fellow developers are having the same problem.

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• Google chrome, native client support and development

  - by hbt

  Hey guys, I would like to write a small C++ app and run it on chrome using the native client API. I have a few questions though: 1) I compiled the examples on Ubuntu and ran the code on firefox but can't run it on chrome (using version 5.0.342.7 beta) Do I need to install something? An extension/plugin? 2) I can't find a single online application I could run? Links anyone, I want to see the power of this thing without having to compile the code locally. Thanks for your help, -hbt PS: I don't know what's the policy with asking multiple questions. If it's a problem, let me know and I will create multiple threads.

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• Strange error: cannot convert from 'int' to 'ios_base::openmode'

  - by Dylan Klomparens

  I am using g++ to compile some code. I wrote the following snippet: bool WriteAccess = true; string Name = "my_file.txt"; ofstream File; ios_base::open_mode Mode = std::ios_base::in | std::ios_base::binary; if(WriteAccess) Mode |= std::ios_base::out | std::ios_base::trunc; File.open(Name.data(), Mode); And I receive these errors... any idea why? Error 1: invalid conversion from ‘int’ to ‘std::_Ios_Openmode’ Error 2: initializing argument 2 of ‘std::basic_filebuf<_CharT, _Traits* std::basic_filebuf<_CharT, _Traits::open(const char*, std::_Ios_Openmode) [with _CharT = char, _Traits = std::char_traits]’ As far as I could tell from a Google search, g++ is actually breaking the C++ standard here. Which I find quite astonishing, since they generally conform very strictly to the standard. Is this the case? Or am I doing something wrong. My reference for the standard: http://www.cplusplus.com/reference/iostream/ofstream/open/

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• Multiple constructors definitions with same name but different signatures (C++)

  - by PuRe_ChAoS12

  With the following code, I keep getting error C2535 when I compile. It's complaining that a member function already defined or declared. Rationnel.h ... class Rationnel { public: Rationnel(int); //Constructor Rationnel(int,int); //Constructor void add(const Rationnel); ... Rationnel.cpp ... //Constructor Rationnel::Rationnel(int n = 1) { numerateur = n; denominateur = 1; } //Constructor Rationnel::Rationnel(int n = 1, int d = 1) { numerateur = n; denominateur = d; } ... Any idea what could be causing the error? Thanks for your time.

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• Using a delegate to populate a listbox

  - by Leroy Jenkins

  Ive been playing around with delegates trying to learn and I ran into one small problem Im hoping you can help me with. class myClass { OtherClass otherClass = new OtherClass(); // Needs Parameter otherClass.SendSomeText(myString); } class OtherClass { public delegate void TextToBox(string s); TextToBox textToBox; public OtherClass(TextToBox ttb) // ***Problem*** { textToBox = ttb; } public void SendSomeText(string foo) { textToBox(foo); } } the form: public partial class MainForm : Form { OtherClass otherClass; public MainForm() { InitializeComponent(); otherClass = new OtherClass(this.TextToBox); } public void TextToBox(string aString) { listBox1.Items.Add(aString); } } Obviously this doesnt compile because the OtherClass constructor is looking for TextToBox as a parameter. How would you recommend getting around the issue so I can get an object from myClass into the textbox in the form?

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• unsupported major .minor version 51.0

  - by ERJAN

  I am trying to use notepad++ as my all-in-one tool edit, run, compile etc. I have jre installed, i have setup my path variable to .../bin directory. When I run my "Hello world" in notepad++ , I get this message: java.lang.UnsupportedClassVersionError: test_hello_world : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(Unknown Source) ......................................... I think the problem here is about versions, some version of java may be old or too new. how do i fix it? should i install jdk , and setup my path variable to JDK instead of jre? difference between PATH variable in jre or jdk?

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• Custom class object in Initialization list

  - by Michael

  I have a class Bar: class Bar { public: Bar(void); ~Bar(void); }; And a class Foo that gets a reference to Bar object as a constructor parameter and needs to save it in a private member bar_ : class Foo { private: Bar& bar_; public: Foo(Bar& bar) : bar_(bar) {} ~Foo(void) {} }; This doesn't compile : overloaded member function not found in 'Parser' missing type specifier - int assumed. Note: C++ does not support default-int Now i suspect couple of things that i need to assure, the second error is for Bar& bar_; declaration in Foo. Do i need to use an explicit constructor when declaring bar_ ? I am interested in learning how the compiler works regarding this matter, so a detailed explanation would be highly appreciated. Thanks.

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• Using C# assemblies from VB6 code. Some issues.

  - by AngryHacker

  I have a C# assembly, which is regasmed, but is not in the GAC. In my VB6 code, I added a reference to the generated type library (the .tlb file). Then I instantiate the C# lib in my VB6 code. If I run it from the VB6 IDE, it does not work. The Set in the code below: Dim obj as MyCSharpNamespace.MyCSharpObject Set obj = New MyCSharpNamespace.MyCSharpObject causes this error: Automation error The system cannot find the file specified However, if I compile the VB6 project to an EXE and run it, it runs perfectly fine. I should add that all the VB6 project files (e.g. forms, modules, etc...) are in the same folder as the C# DLL and TLB. So why can't I run it from the IDE environment?

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• How does compilation work with AOP?

  - by alee

  I need quick answer to a simple thing in AOP. If i have a code deployed at client side and i have written new aspects, which i want in the client side software. do i have to "recompile" complete software with "original" code and new "AOP" code? (with aop compiler)? i.e. do i need the source code of original program with source code of new AOP and compile 'em boht? P.S: I am asking in general, not being specific to any language.

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• Multi-argument decorators in 2.6

  - by wheaties

  Generally don't do OO-programming in Python. This project requires it and am running into a bit of trouble. Here's my scratch code for attempting to figure out where it went wrong: class trial(object): def output( func, x ): def ya( self, y ): return func( self, x ) + y return ya def f1( func ): return output( func, 1 ) @f1 def sum1( self, x ): return x which doesn't compile. I've attempted to add the @staticmethod tag to the "output" and "f1" functions but to no avail. Normally I'd do this def output( func, x ): def ya( y ): return func( x ) + y return ya def f1( func ): return output( func, 1 ) @f1 def sum1( x ): return x which does work. So how do I get this going in a class?

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• New instruction sets in CPU

  - by Tomek Tarczynski

  Every new generation of CPU introduces some sets of new instruction, ie.: MMX,3DNOW,SSE and so on. I've got few general questions about them: 1) If some program uses for example SSE instruction can it be run on CPU that doesn't support SSE? 2) If yes , does it mean that those instuction will be changed to some greater number of simpler instuctions? 3) If not, does it mean that the real perfomance impact of such new instructions will be after few years when most CPU will support such technology (so there won't be any incompatibilities)? 4) When I compile a C++ program with optimizations does it mean that it'll use some of this new instructions? (I know that it depends on many factors, especcialy on the code, but I want some general answer) Or are they reserved mostly for programs written in asm?

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• Ant: make "available" throw an understandable error?

  - by digitala

  When running ant, how do I make an <available /> block throw an adequate error message? This is what I have so far: <target name="requirements"> <available classname="foo.bar.baz" property="baz.present" /> </target> <target name="directories" depends="requirements" if="baz.present"> <mkdir dir="build" /> </target> <target name="compile" depends="directories"> <!-- build some stuff --> </target> What I'm currently seeing when requirements fails is a message complaining about the ./build dir not being available. How can I change this so that a message is displayed about the missing class, such as "foo.bar.baz is not available"?

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• Cheapest way of binding local variable to closure

  - by mmotorny

  I believe following to be a cheapest way of binding local variable to closure: void ByRValueReference(A&& a) { } std::function<void ()> CreateClosureByRValueReference() { A a; std::function<void ()> f = std::bind(&ByRValueReference, std::move(a)); // !!! return f; } However, it does not compile under Clang 3.1: error: no viable conversion from '__bind<void (*)(A &&), A>' to 'std::function<void ()>' and gcc 4.6.1: /usr/include/c++/4.6/functional:1778:2: error: no match for call to ‘(std::_Bind<void (*(A))(A&&)>) ()’ Am I violating the standard or it's just broken standard libraries?

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• Extracting rightmost N bits of an integer

  - by srandpersonia

  In the yester Code Jam Qualification round http://code.google.com/codejam/contest/dashboard?c=433101#s=a&a=0 , there was a problem called Snapper Chain. From the contest analysis I came to know the problem requires bit twiddling stuff like extracting the rightmost N bits of an integer and checking if they all are 1. I saw a contestant's(Eireksten) code which performed the said operation like below: (((K&(1<<N)-1))==(1<<N)-1) I couldn't understand how this works. What is the use of -1 there in the comparison?. If somebody can explain this, it would be very much useful for us rookies. Also, Any tips on identifying this sort of problems would be much appreciated. I used a naive algorithm to solve this problem and ended up solving only the smaller data set.(It took heck of a time to compile the larger data set which is required to be submitted within 8 minutes.). Thanks in advance.

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• How to mock WCF Web Services with Rhino Mocks.

  - by Will

  How do I test a class that utilizes proxy clients generated by a Web Service Reference? I would like to mock the client, but the generated client interface doesn't contain the close method, which is required to properly terminate the proxy. If I don't use the interface, but instead a concrete reference, I get access to the close method but loose the ability to mock the proxy. I'm trying to test a class similar to this: public class ServiceAdapter : IServiceAdapter, IDisposable { // ILoggingServiceClient is generated via a Web Service reference private readonly ILoggingServiceClient _loggingServiceClient; public ServiceAdapter() : this(new LoggingServiceClient()) {} internal ServiceAdapter(ILoggingServiceClient loggingServiceClient) { _loggingServiceClient = loggingServiceClient; } public void LogSomething(string msg) { _loggingServiceClient.LogSomething(msg); } public void Dispose() { // this doesn't compile, because ILoggingServiceClient doesn't contain Close(), // yet Close is required to properly terminate the WCF client _loggingServiceClient.Close(); } }

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• J2EE: Default values for custom tag attributes

  - by Nick

  So according to Sun's J2EE documentation (http://docs.sun.com/app/docs/doc/819-3669/bnani?l=en&a=view), "If a tag attribute is not required, a tag handler should provide a default value." My question is how in the hell do I define a default value as per the documentation's description. Here's the code: <%@ attribute name="visible" required="false" type="java.lang.Boolean" %> <c:if test="${visible}"> My Tag Contents Here </c:if> Obviously, this tag won't compile because it's lacking the tag directive and the core library import. My point is that I want the "visible" property to default to TRUE. The "tag attribute is not required," so the "tag handler should provide a default value." I want to provide a default value, so what am I missing? Any help is greatly appreciated.

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• Best way to style GWT widgets in a library

  - by helios

  I'm developing some widgets into a library for internal use at the company I work for. I don't know what's the recommended way to style the widgets. There are at least these ways: use Widget.setPrimaryStyleName and let the user provide an external css. We use maven archetypes to build applications so we can provide default styles. Anyway I don't like it very much. use the GWT 2.0 CssResourceBundle. So we can compile the CSS into the module and it will be optimized (and it can be browser-dependant too). provide a module with the styling. Something like the default GWT themes. But I don't know how exactly this works. I want to: make the components as cohesive as I can (don't depend on externally included css's) leave open the door to modify styles (if I want to change the way some widget looks in a concrete application). What's your experience in this subject?

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• Looking for marg_setValue fix in iPhoneOS

  - by John Smith

  I am trying to compile a library originally written for Cocoa. Things are good until it looks for the function marg_setValue(). It says there is a syntax error before char in marg_setValue(argumentList,argumentOffset,char,(char)lua_toboolean(state,luaArgument)); (it's talking about the third argument, not (char) ) I am trying to port LuaObjectiveCBridge to the iPhone. It has two choices, either using Runtime or Foundation. I have discovered there are some problems with foundation so I am trying runtime. But the compiler is not co-operating.

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• python regex for repeating string

  - by Lars Nordin

  I am wanting to verify and then parse this string (in quotes): string = "start: c12354, c3456, 34526;" //Note that some codes begin with 'c' I would like to verify that the string starts with 'start:' and ends with ';' Afterward, I would like to have a regex parse out the strings. I tried the following python re code: regx = r"V1 OIDs: (c?[0-9]+,?)+;" reg = re.compile(regx) matched = reg.search(string) print ' matched.groups()', matched.groups() I have tried different variations but I can either get the first or the last code but not a list of all three. Or should I abandon using a regex?

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