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• C question: no warning ???

  - by Grv

  main() { printf("Hello World."); } Why does no warning is produced in gcc compiler even though we declare main() with return type 'int'

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• Warning: pointer of type 'void *' used in subtraction

  - by idealistikz

  Although it runs correctly, the following results in the aforementioned compiler warning: return ((item - (my->items))/(my->itemSize)); 'item' is a 'void *'; 'my-items' is a 'void *'; 'my-itemSize' is an 'int' Casting 'item' and 'my-items' as an 'int *' caused the program to run improperly. What is the best way to remove the warning?

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• Method Overloading for NULL parameter

  - by Phani

  I have added three methods with parameters: public static void doSomething(Object obj) { System.out.println("Object called"); } public static void doSomething(char[] obj) { System.out.println("Array called"); } public static void doSomething(Integer obj) { System.out.println("Array called"); } When I am calling doSomething(null) , then compiler throws error as ambiguous methods. So Is the issue because Integer and char[] methods or Integer and Object methods?

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• oprofile unable to produce call graph

  - by aaa

  hello I am trying to use oprofile to generate call graph. Compiler is g++, platform is linux x86-64, linker is gfortran C++ code is compiled with -fno- omit-frame-pointer. oprofile is started with --callgraph=25. report I run with --callgraph. the call graph is produced but it's only includes self time, which is not much use what am I missing?

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• Why can't i create a RESTful web service in ejb module?

  - by Nitesh Panchal

  Hello, I am using Netbeans 6.8. I can see an option to create a web service in my independent ejb module but i can't seem to find an option to create a RESTful based web service in my ejb module. Is there any kind of restriction in ejb module that i can only create SOAP based web service and not RESTful? or is it the bug of Netbeans 6.8?

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• Is arithmetic overflow/underflow generally checked in .Net framework methods?

  - by YWE

  For example, let's use the Add method of the ArrayList class. If I am using the default compiler settings in Visual Studio C# project in which arithmetic overflow is not checked, would ArrayList.Add() throw an OverflowException if I added too many items? Would surrounding the method call with checked or unchecked make any difference? BTW, I would write a test program to determine the answer to this question if I had Visual Studio available to me right now.

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• Hidden features of C

  - by bernardn

  I know there is a standard behind all C compiler implementations, so there should be no hidden features. Despite that, I am sure all C developers have hidden/secret tricks they use all the time.

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• Writing a Python extension in Go (golang)

  - by tehwalrus

  I currently use Cython to link C and Python, and get speedup in slow bits of python code. However, I'd like to use go routines to implement a really slow (and very parallelizable) bit of code, but it must be callable from python. (I've already seen this question) I'm (sort of) happy to go via C (or Cython) to set up data structures etc if necessary, but avoiding this extra layer would be good from a bug fix/avoidance point of view. What is the simplest way to do this without having to reinvent any wheels?

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• How to host 50 domains/sites with common Django code base

  - by Off Rhoden

  I have 50 different websites that use the same layout and code base, but mostly non-overlapping data (regional support sites, not link farm). Is there a way to have a single installation of the code and run all 50 at the same time? When I have a bug to fix (or deploy new feature), I want to deploy ONE time + 1 restart and be done with it. Also: Code needs to know what domain the request is coming to so the appropriate data is displayed.

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• Abstract attributes in Python

  - by deamon

  What is the shortest / most elegant way to implement the following Scala code with an abstract attribute in Python? abstract class Controller { val path: String } A subclass of Controller is enforced to define "path" by the Scala compiler. A subclass would look like this: class MyController extends Controller { override val path = "/home" }

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• Unsigned Integer

  - by viswanathan

  I was curious to know what would happen if i assign a negative value to an unsigned variable. The code will look somewhat like this. unsigned int nVal = 0; nVal = -5; It didnt give me any compiler error. When i ran the nVal was having strange value. Could it be that some 2's complement value gets assigned to nVal.

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• C++ DLL creation for C# project - No functions exported

  - by Yeti

  I am working on a project that requires some image processing. The front end of the program is C# (cause the guys thought it is a lot simpler to make the UI in it). However, as the image processing part needs a lot of CPU juice I am making this part in C++. The idea is to link it to the C# project and just call a function from a DLL to make the image processing part and allow to the C# environment to process the data afterwards. Now the only problem is that it seems I am not able to make the DLL. Simply put the compiler refuses to put any function into the DLL that I compile. Because the project requires some development time testing I have created two projects into a C++ solution. One is for the Dll and another console application. The console project holds all the files and I just include the corresponding header into my DLL project file. I thought the compiler should take out the functions that I marked as to be exported and make the DLL from them. Nevertheless this does not happens. Here it is how I defined the function in the header: extern "C" __declspec(dllexport) void _stdcall RobotData(BYTE* buf, int** pToNewBackgroundImage, int* pToBackgroundImage, bool InitFlag, ObjectInformation* robot1, ObjectInformation* robot2, ObjectInformation* robot3, ObjectInformation* robot4, ObjectInformation* puck); extern "C" __declspec(dllexport) CvPoint _stdcall RefPointFinder(IplImage* imgInput, CvRect &imgROI, CvScalar &refHSVColorLow, CvScalar &refHSVColorHi ); Followed by the implementation in the cpp file: extern "C" __declspec(dllexport) CvPoint _stdcall RefPointFinder(IplImage* imgInput, CvRect &imgROI,&refHSVColorLow, CvScalar &refHSVColorHi ) { \\... return cvPoint((int)( M10/M00) + imgROI.x, (int)( M01/M00 ) + imgROI.y) ;} extern "C" __declspec(dllexport) void _stdcall RobotData(BYTE* buf, int** pToNewBackgroundImage, int* pToBackgroundImage, bool InitFlag, ObjectInformation* robot1, ObjectInformation* robot2, ObjectInformation* robot3, ObjectInformation* robot4, ObjectInformation* puck) { \\ ...}; And my main file for the DLL project looks like: #ifdef _MANAGED #pragma managed(push, off) #endif /// <summary> Include files. </summary> #include "..\ImageProcessingDebug\ImageProcessingTest.h" #include "..\ImageProcessingDebug\ImageProcessing.h" BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) { return TRUE; } #ifdef _MANAGED #pragma managed(pop) #endif Needless to say it does not work. A quick look with DLL export viewer 1.36 reveals that no function is inside the library. I don't get it. What I am doing wrong ? As side not I am using the C++ objects (and here it is the C++ DLL part) such as the vector. However, only for internal usage. These will not appear in the headers of either function as you can observe from the previous code snippets. Any ideas? Thx, Bernat

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• asp.net gridview edit button click error

  - by harold-sota

  I have this exception i have a asp.net gridview with select edit and delete button when i click edit or delete i have this bug. the gridview is inside a update pane Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: The GridView 'combinationViewGridView' fired event RowEditing which wasn't handled. any ideas

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• Iterator not accessible because of private inheritance

  - by Bo Tian

  I've created a new class that composes std::deque by private inheritance, i.e, class B : private std::deque<A> { ... }; and in my source code I tried to use iterator of B, i.e., B::iterator it The compiler error is error C2247: 'std::deque<_Ty>::iterator' not accessible because 'B' uses 'private' to inherit from 'std::deque<_Ty>' So the question is, how can I make the iterator accessible?

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• Query.fetch(limit=2000) only moves cursor forward by 1000 entities?

  - by Liron

  Let's say I have 2500 MyModel entities in my datastore, and I run this code: query = MyModel.all() first_batch = query.fetch(2000) len(first_batch) # 2000 next_query = MyModel.all().with_cursor(query.cursor()) next_batch = next_query.fetch(2000) What do you think len(next_batch) is? 500, right? Nope - it's 1500. Apparently the query cursor never moves forward by more than 1000, even when the query itself returns more than 1000 entities. Should I do something different or is it just an App Engine bug?

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• Defining your own Ord for a data type

  - by mvid

  I am attempting to make some data structures to solve a graph puzzle. I am trying to define an edge's comparison criteria, but I am not sure how. So far: data Edge = Edge (Set String) Bool How do I tell let the compiler know that I want edges to be declared equal if they have identical sets of strings, and not have equality have anything to do with the boolean value?

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• Jquery slider going the wrong way

  - by Rob

  Im using a jquery slider and having an issue with what direction it scrolls on click. It seems to screw up after clicking the right arrow then left, but will scroll left if clicked first, weird. Is this a bug or am I missing something here? PS- Im using Chrome (Mac) but seems to behave the same with Firefox and Safari See example http://www.warface.co.uk/clients/warface.co.uk/blog/ Please click the red central arrow to reveal the slider. Many thanks Rob

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• What's the good of IDE's auto generated @override annotation ?

  - by Tony

  I am using eclipse , when I use shortcut to generate override implementations , there is an override annotation up there , I am using JDK 6 , this is all right , but under JDK 5 this annotation will cause an error, so I want to ask , if this annotation is completely useless ? Will compiler do some kind of optimization using this annotation ?

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• How to run 64 bit apps on 32 bit os

  - by Sirish Kumar

  Hi, I am using 32 bit openSUSE OS, and I am using a cross compiler to build 64 bit application( it does not support building 32 apps) as our software will be deployed on a machine which is 64 bit OS. As testing on target is not always possible, is there anyway to run this applications on my 32 bit OS.

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• what is your java 1.6 favorite feature

  - by ekeren

  what is your java 1.6 favorite feature? Java 6 has some nifty feature: SeriveLocator Support to Scripting language Acess to Compiler APT enhancement (Annotation) And more... What is the one you like the most, and found it very useful?

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• How to add a new custom resource to routes Rails 3

  - by Jeroen janssen

  How do I add a custom route for a new resource in the Rails 3 routes? I know how to do it for collections and members but this style doesn't seem to be working for new resources. Is this a bug or am I doing something wrong? So these work: collection do get :wish end member do get :wish end But this doesn't work: new do get :wish end

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• Casting between value types on a class using generics

  - by marcelomeikaru

  In this section of a function (.NET 2.0): public void AttachInput(T input, int inIndex) where T : struct { if (input is int) { Inputs.Add(inIndex, (int)input); InputCount++; IsResolved = false; } } The compiler shows the error "Cannot convert type 'T' to 'int'. So, I used Convert.ToInt32() which worked - but does it box input to an object? Is there a better solution? Thanks

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• Looking for a good C++ based RSS API

  - by Rhubarb

  I tried http://code.google.com/p/feed-reader-lib but holy cow, talk about difficult to build. It has a nightmare of dependencies on Xerces and Xalan, both of which seem to be choking under the new VisualStudio 2010 C++ compiler. I've wasted hours trying to build this thing which is a shame. Does anyone have anything a little easier to hit the ground running with?

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• Promote a free library on the web

  - by moster67

  I have nearly finished a free spellchecker library for Windows Mobile, and there are a few great forums around (both for developers and end-users), such as XDA, where you can promote your creations for Windows Mobile. However, I have been thinking that I'd like to make a version of my library available for Windows desktop developers as well. Once I have finished the same, I'd like to distribute and promote it to get feedback, bug reports, and suggestions. Are there good developer forums for promoting and distributing applications or libraries in this way?

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• sort arrow is always showing up once sorting is used

  - by kksachin

  we have several pages as tabs where datatable is used in most of the pages.when we sort on a particular coulmn and exit the page and re enter this page the arrow appears(up /down based on how we left) Although the data is not sorted in the direction the arrow shows.i have set preserveSort and preserveDataMode to false. The arrow is set to true in the column's t:commandSortHeader tag in all the pages. is this a bug or am i missing any setting?I have tried to set forceId to false in t:commandSortHeader but of now use.

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