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• what is duck typing?

  - by ashish yadav

  I recently read an article about duck-typing.It said about calling functions of different classes using object of any class. Is it true?And how will the compiler do it on runtime? I apologize if i am not clear.But it really fascinates me , if we could do it dynamically. So if u people got any idea.I am all ears. thank you!! how will the function be accessed by object of any other class. that violates the basic principle of OOP.and that too dynamically during runtime. And is this feature possible in case of OOP languages?

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• What do I return if the return type of a method is Void? (Not void!)

  - by DR

  Due to the use of Generics in Java I ended up in having to implement a function having Void as return type: public Void doSomething() { //... } and the compiler demands that I return something. For now I'm just returning null, but I'm wondering if that is good coding practice... I've also tried Void.class, void, Void.TYPE, new Void(), no return at all, but all that doesn't work at all. (For more or less obvious reasons) (See this answer for details) So what am I supposed to return if the return type of a function is Void? What's the general use of the Void class? EDIT: Just to spare you the downvotes: I'm asking about V?oid, not v?oid. The class Void, not the reserved keyword void.

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• Difference between implementing an interface and applying an attribute in C#

  - by RemotecUk

  This might be a stupid question but Ill ask anyway, I was reading "OOP Demystified: A Self-Teaching Guide by Jim Keogh and Mario Giannini" chapter 11 which covers interfaces. The examples in this book are C++. I noticed that C++ uses ISerializable to make a class serializable which you would implement where as in C# you just attribute the class with the [Serializable] attribute. What is the key difference here? Is it that with an interface you must provide the implementation where as if you attribute something the compiler will work out the implementation for you? I guess that with the [Serializable] attribute the .Net framework uses reflection to make the serialized object from the actual object. That said is it possible in that case to have an [Disposable] attribute or using my theory above the framework wont know how to actually dispose of an object hence you have to do it yourself? Would be grateful for a clarification. Thanks.

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• Advice when using COM Object/CComPtr and the STL

  - by YoungPony

  Hello, I am doing some COM related things with directshow such as: typedef CComPtr<IBaseFilter> AutoIBaseFilterPtr; map<CString, AutoIBaseFilterPtr> _filterMap; To store a list of directShow related com objects and their friendly name. After finding this article (See:Problem 2) on how changes in VC10 compiler might effect previously OK code, I am wondering if there are any more things to watch out for when mixing the STL and CComPtr or prehaps just mixing the STL and COM in general. Any tips would be greatly appreciated, thanks

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• Problem using Blend 3 Interaction.Behaviours in VS2010

  - by Andre Luus

  There seems to be a problem with support for the Interactivity namespace of Blend 3 in the VS2010 xaml editor. I have the following installed: VS2010 Blend 3 + Blend 3 SDK I am trying to compile a demo project that is targeted at .Net 4 Client Profile and has a reference to System.Windows.Interactivity (in the Blend 3 folder). In the object browser everything appears to be fine. I can also access Interaction.Behaviours from code-behind, but if I put the namespace xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" in the xaml file and try to use it, the intellisense is blank. If I copy something in there anyway, the compiler says: The tag 'Interaction.Behaviors' does not exist in XML namespace 'http://schemas.microsoft.com/expression/2010/interactivity'. Do I need to install Blend 4 RC or something?

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• Are preprocessors obsolete in modern languages?

  - by Earlz

  Hello, I'm making a simple compiler for a simple pet language I'm creating and coming from a C background(though I'm writing it in Ruby) I wondered if a preprocessor is necessary. What do you think? Is a "dumb" preprocessor still necessary in modern languages? Would C#'s conditional compilation capabilities be considered a "preprocessor"? Does every modern language that doesn't include a preprocessor have the utilities necessary to properly replace it? (for instance, the C++ preprocessor is now mostly obsolete(though still depended upon) because of templates.)

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• When is calculating or variable-reading faster?

  - by Andreas Hornig

  hi, to be honest, I don't really know what the "small green men" in my cpu and compiler do, so I sometimes would like to know :). Currently I would like to know what's faster, so that I can design my code in a more efficient way. So for example I want to calclate something at different points in my sourcecode, when will it be faster to calculate it once and store it in a variable that's read and used for the next points it's needed and when is it faster to calculate it everytime? I think it's depending on how "complex" and "long" the calculation is and how fast then cache is, where variables are stored, but I don't have any clue what's faster :). Thanks for any reply to my tiny but important question! Andreas PS: perhaps it's important to know that I code in JAVA, but it's more a genral question.

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• Static compilation in the .NET world

  - by AngryHacker

  I'll be writing a small desktop app for a client that has WinXP machines and they won't be installing the .NET framework (at least not for me). So my choices are limited to either C++ or VB6, neither of which sound great. I remember reading back in the day that Mono came up with a static compiler, but recently the only thing I could find is Miguel de Icaza's entry on static compilation for a game engine for the purposes of running the app on the iPhone - not what I had in mind. Are there any products out there, free or commercial that will allow me to statically compile my .net 3.5 winform app? Thanks

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• Compile C# into objective-C

  - by Ali Shafai

  Now that monotouch is being banned, I was wondering if there is a way to translate C# (or some other modern language for that matter) into objective-C? I won't mind using apple's api as long as I don't have to declare my variables in 3-4 stages (ivar-property-synthesize-dealloc). All I want is a less wordy language to concentrate on my intent and not on the compiler syntax. unfortunately apple in its arrogance thinks objective-c is a "modern" language and if you are looking for an alternative (monotouch) it's because you are incapable of coding. also if you don't find programming in itunes; sorry, xcode enjoyable, it is not because there are better alternatives, it's because you are stupid. anyway back to my original question: can it be done?

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• Proper use of Q_OBJECT?

  - by Jen

  If I derive my class from QObject (or a subclass), the Qt documentation says that I have to put the Q_OBJECT macro into my class declaration. It also ways I need to "run the meta-object compiler" for my class. I have no idea how to do this. Is this something I need to add to the .pro file? Do I need to edit the makefile? This seems overly complicated for a simple derived class. I'm using Qt Creator.

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• Why I am not able to display image using swing worker?

  - by Vimal Basdeo

  I was trying some codes to implement a scheduled task and came up with these codes . import java.util.*; class Task extends TimerTask { int count = 1; // run is a abstract method that defines task performed at scheduled time. public void run() { System.out.println(count+" : Mahendra Singh"); count++; } } class TaskScheduling { public static void main(String[] args) { Timer timer = new Timer(); // Schedule to run after every 3 second(3000 millisecond) timer.schedule( new Task(), 3000); } } My output : 1 : Mahendra Singh I expected the compiler to print a series of Mahendra Singh at periodic interval of 3 s but despite waiting for around 15 minutes, I get only one output...How do I solve this out?

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• Limit a program's execution time in C (Monte Carlo technique)

  - by rrs90

  I am working on a project which has no determined algorithm to solve using C language. I am Using Monte Carlo technique for solving that problem. And the number of random guesses I want to limit to the execution time specified by the user. This means I want to make full use of the execution time limit defined by the user (as a command line argument) to make as many random iterations as possible. Can I check the execution time elapsed so far for a loop condition. Eg: for(trials=0;execution_time P.S. I am using code blocks 10.05 for coding and GNU compiler.

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• Perl equivalent to Java's "throws" clausule.

  - by Konerak

  Is there a way in Perl to declare that a method can throw an error (or die)? I always loved how in Java, a method could handle an Exception and/or throw it. The method signature allows to put "throws MyException", so a good IDE/compiler would know that if you use said method somewhere in your code, you'd have to check for the Exception or declare your function to "throws" the Exception further. I'm unable to find something alike in Perl. A collegue of mine wrote a method which "dies" on incorrect input, but I forget to eval-if($@) it... offcourse the error was only discovered while a user was running the application. (offcourse I doubt if there is any existing IDE that could find these kind of things for Perl, but atleast perl -cw should be able to, no?)

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• How to add flags to RC.EXE through QMake .pro makefiles

  - by Hernán

  I've the following definition in my .pro file: RC_FILE = app.rc This RC file contains a global include at the top: #include "version_info.h" The version_info.h header is on a common header files directory. Since RC.EXE takes INCLUDE environment variable in consideration, according to MS documentation, my build process batch sets up that accordingly: SET INCLUDE=%PROJECTDIR%\version;%INCLUDE% ... QMAKE project.pro -spec win32-msvc2008 -r CONFIG += release This works perfect as RC seems to read that INCLUDE var so the "version_info.h" file is including on every RC file properly. The problem is when I generate a VS solution (or Import it through the VS Addin). The RC invocation does not contain any /I flag (as I expect) but does not read any INCLUDE variable, even when I've setup through system 'environment variables' dialog in XP. So I'm stuck with this problem, with two alternatives I could not get to work: Make VS RC.exe invocation honour the INCLUDE variable (didn't work either as user or system variable). Force QMAKE to pass /I flag to RC invocation, and get that /I flag imported into the project settings (Resource Compiler properties). Thanks in advance.

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• Compiling netcat on AIX

  - by A.Rashad

  I have been trying to compile netcat.c on AIX for some time (using the command make aix), but the compiler gives me some weird feedback such as : "netcat.c", line 117.12: 1506-275 (S) Unexpected text 'int' encountered. when checked the file netcat.c at line 117, I would find the line (second line in code below): #ifdef HAVE_BIND extern int h_errno; /* stolen almost wholesale from bsd herror.c */ even if I changed the int into char for the same of testing, save the file and re-run the command I get the same error am I missing something in reading the error code?

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• Override the neutral language of a specific resource file within an assembly

  - by Sandor Drieënhuizen

  I have an assembly that contains several resource files. Most of them have the neutral language 'nl' (Dutch, specified on the assembly as the neutral language), so I don't specify the 'nl' in their filenames. However, I'm putting strings in the English language in some other resource files (they are internal error messages) and I will never provide Dutch translations of them. If I name those resource files something like 'Errors.en.resx', no designer class is generated (breaks the build) because there is no 'Errors.resx'. This is annoying because now I have to put 'en' strings into a 'nl'-implied resource file and I really don't want to translate those strings to 'nl' or provide empty strings just to satisfy the compiler. Is there a way to override the neutral language on a specific resource file or perhaps somehow have the 'Errors.en.resx' build a designer class?

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• Is Updating double operation atomic

  - by Yan Cheng CHEOK

  In Java, updating double and long variable may not be atomic, as double/long are being treated as two separate 32 bits variables. http://java.sun.com/docs/books/jls/second_edition/html/memory.doc.html#28733 In C++, if I am using 32 bit Intel Processor + Microsoft Visual C++ compiler, is updating double (8 byte) operation atomic? I cannot find much specification mention on this behavior. When I say "atomic variable", here is what I mean : Thread A trying to write 1 to variable x. Thread B trying to write 2 to variable x. We shall get value 1 or 2 out from variable x, but not an undefined value.

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• Best resource for serious Commodore 64 programming.

  - by postfuturist

  What is the best resource for serious Commodore 64 programming? Assume that serious programming on the Commodore 64 is not done in BASIC V2 that ships with the Commodore 64. I feel like most of the knowledge is tied up in old books and not available on the internet. All that I have found online are either very beginner style introductions to Commodore 64 programming (Hello world), or arcane demo-coder hacks to take advantage of strange parts of the hardware. I haven't found a well-explained list of opcodes, memory locations for system calls, and general mid-level examples and tips. Main portals I have found: lemon64 C-64 Scene Database c64web Actually hosted on a Commodore 64! Tools I have found: cc65 A C compiler that can target Commodore 64.

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• cross-compiling autoconf-based tools with mingw on Mac OS X

  - by paleozogt

  I'd like to cross-compile some open-source libraries (libiconv, gettext, glib2) for windows using mingw on Mac OS X. I've installed mingw on Mac with MacPorts. But now I'm not sure what to give to the configure script so that it will work. The cross-compilation tutorials I've seen all talk about makefiles, but no one mentions what to give autoconf-based projects. I'm configuring like this: ./configure --prefix=/opt/local/i386-mingw32 --host=i586-mingw32msvc but it doesn't seem to take. While the configure will pass, running "make" will give this error: i686-apple-darwin9-gcc-4.0.1: no input files I thought the "--host" argument to configure was supposed to tell it to use the mingw compiler? I'm not sure what's going on here.

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• C++ find method is not const?

  - by Rachel

  I've written a method that I'd like to declare as const, but the compiler complains. I traced through and found that this part of the method was causing the difficulty: bool ClassA::MethodA(int x) { bool y = false; if(find(myList.begin(), myList.end(), x) != myList.end()) { y = true; } return y; } There is more happening in the method than that, but with everything else stripped away, this was the part that didn't allow the method to be const. Why does the stl find algorithm prevent the method from being const? Does it change the list in any way?

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• What is technically more advanced: Brainf*ck or Assembler?

  - by el ka es

  I wondered which of these languages is more powerful. With powerful I don't mean the readability, assembler would be naturally the winner here, but something resulting from, for example, the following factors: Which of them is more high-level? (Both aren't really but one has to be more) Who would be the possibly fastest in compiled state? (There is no BF compiler out there as far as I know but it wouldn't be hard writing one I suppose) Which of the both has the better code length/code action ratio? What I mean is If you get to distracted by the, compared to Brainf*ck, improved readability of assembler, just think of writing plain binary/machine code as what assembler assembles to. Both languages are so basic that it should be possible to answer the question(s) in a rather objective view, I hope.

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• Why is the JVM stack-based and the DalvikVM register based?

  - by aioobe

  I'm curious, why did Sun decide to make the JVM stack-based and Google decide to make the DalvikVM register based? I suppose the JVM can't really assume that a certain number of registers are available on the target platform, since it is supposed to be platform independent. Therefor it just postpones the register-allocation etc, to the JIT compiler. (Correct me if I'm wrong.) So the Android guys thought, "hey, that's inefficient, let's go for a register based vm right away..."? But wait, there are multiple different android devices, what number of registers did the Dalvik target? Are the Dalvik opcodes hardcoded for a certain number of registers? Do all current Android devices on the market have about the same number of registers? Or, is there a register re-allocation performed during dex-loading? How does all this fit together?

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• Are there tools that would be suitable for maintaining a changelog for a Cabal Haskell package?

  - by Norman Ramsey

  I'm working fast and furiously on a new Haskell package for compiler writers. I'm going through many minor version numbers daily, and the Haskell packaging system, Cabal, doesn't seem to offer any tools for updating version numbers or for maintaining a change log. (Logs are going into git but that's not visible to anyone using the package.) I would kill for something equivalent to Debian's uupdate or dch/debchange tools. Does anyone know of general-purpose tools that could be used to increment version numbers automatically and add an entry to a change log?

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• SMS: AT COMMANDS

  - by I__

  i am trying to set up an SMS gateway on my computer here's some code i found: AT OK AT+CMGF=1 OK AT+CMGL="ALL" +CMGL: 1,"REC READ","+85291234567",,"06/11/11,00:30:29+32" Hello, welcome to our SMS tutorial. +CMGL: 2,"REC READ","+85291234567",,"06/11/11,00:32:20+32" A simple demo of SMS text messaging. OK can this be done in windows? what steps do i have to take in order to set this up? what is the compiler? how do i get started?

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• Weak linking on iPhone refuses to work

  - by Jonathan Grynspan

  I've got an iPhone app that's mainly targetting 3.0, but which takes advantage of newer APIs when they're available. Code goes something like this: if (UIApplicationDidEnterBackgroundNotification != NULL) [nc addObserver: self selector: @selector(irrelelvantCallbackName:) name: UIApplicationDidEnterBackgroundNotification object: nil]; Now, according to everything Apple's ever said, if the relevant APIs are weakly linked, that will work fine because the dynamic linker will evaluate UIApplicationDidEnterBackgroundNotification to NULL. Except that it doesn't. The application compiles, but as soon as it hits "if (UIApplicationDidEnterBackgroundNotification != NULL)" it crashes with EXC_BAD_ACCESS. Is this simply a matter of a compiler flag I need to set? Or am I going about this the wrong way?

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