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  • Return a pointer to a char array in C

    - by snitko
    I've seen a lot of questions on that on StackOverflow, but reading the answers did not clear that up for me, probably because I'm a total newbie in C programming. Here's the code: #include <stdio.h> char* squeeze(char s[], char c); main() { printf("%s", squeeze("hello", 'o')); } char* squeeze(char s[], char c) { int i, j; for(i = j = 0; s[i] != '\0'; i++) if(s[i] != c) s[j++] = s[i]; s[j] = '\0'; return s; } It compiles and I get segmentation fault when I run it. I've read this faq about about returning arrays and tried the 'static' technique that is suggested there, but still could not get the program working. Could anyone point out exactly what's wrong with it and what should I be paying attention in the future?

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  • Subsume external library into source tree with Autotools.

    - by troutwine
    I am developing a new project, using Autotools for my build infrastructure. I would like to subsume external dependencies into my source tree. These dependencies are using Autotools, as well. How can I configure my project's build scripts to build and link against subsumed dependencies? Though Duret-Lutz's tutorial is excellent, this situation is only briefly addressed in a few slides. I found his explanation deeply confusing. By adding the directory name of subsumed dependencies to the toplevel Makefile.am's SUBDIRS the dependency is being configured and built. It is possible to manually set include paths through CFLAGS, but how do I link against libtool .la files?

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  • pointer reference type

    - by Codenotguru
    I am trying to write a function that takes a pointer argument, modifies what the pointer points to, and then returns the destination of the pointer as a reference. I am gettin the following error: cannot convert int***' toint*' in return| Code: #include <iostream> using namespace std; int* increment(int** i) { i++; return &i;} int main() { int a=24; int *p=&a; int *p2; p2=increment(&p); cout<<p2; } Thanks for helping!

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  • DRY programming dilemma

    - by fayer
    the situation is like this: im creating a Logger class that can write to a file but the write_to_file() function is in a helper class as a static function. i could call that function but then the Log class would be dependent to the helper class. isn't dependency bad? but if i can let it use a helper function then what is the point of having helper functions? what should one prioritize here: using helper functions and have to include this helper class everywhere (but the other 99 methods wont be useful) or just copy and paste into the Log class (but then if i have done this 100 times and then make a change i have to change in 100 places). share your thoughts and experience!

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  • Unit testing several implementation of the same trait/interface

    - by paradigmatic
    I program mostly in scala and java, using scalatest in scala and junit for unit testing. I would like to apply the very same tests to several implementations of the same interface/trait. The idea is to verify that the interface contract is enforced and to check Liskov substitution principle. For instance, when testing implementations of lists, tests could include: An instance should be empty, if and only if and only if it has zero size. After calling clear, the size sould be zero. Adding an element in the middle of a list, will increment by one the index of rhs elements. etc. What are the best practices ?

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  • Use of IsAssignableFrom and "is" keyword in C#

    - by fearofawhackplanet
    While trying to learn Unity, I keep seeing the following code for overriding GetControllerInstance in MVC: if(!typeof(IController).IsAssignableFrom(controllerType)) { ... } this seems to me a pretty convoluted way of basically writing if(controllerType is IController) { ... } I appreciate there are subtle differences between is and IsAssignableFrom, ie IsAssignableFrom doesn't include cast conversions, but I'm struggling to understand the implication of this difference in practical scenarios. When is it imporantant to choose IsAssignableFrom over is? What difference would it make in the GetControllerExample? if (!typeof(IController).IsAssignableFrom(controllerType)) throw new ArgumentException(...); return _container.Resolve(controllerType) as IController;

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  • Access / Excel crossover: Should i attach spreadsheets to records

    - by glinch
    Hi, I currently have an archaic system of client records that I am trying to improve. For each client i have a directory, in that directory i include a directory for each job. Each job has a spreadsheet that i use to store their personal details, and run calculations and costings specific to their needs. In turn I also have word documents that are linked to their spreadsheet which automatically update accordingly. The spreadsheet is also exported as a pdf as well I am trying to build a database of customer records in Access, straight forward enough. For each new customer i need to be able to add the appropriate spreadsheet to their records, update the spreadsheet accordingly with their details, use the spreadsheet to calculate their costings etc.. I do not want to enter the same information repeatedly, and would like a cohesive system, with data being passed between access and excel. Should this be easy enough to do with the two packages? Thanks in advance Noel

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  • Why is there ambiguity in this diamond pattern?

    - by cambr
    #include <iostream> using namespace std; class A { public: void eat(){ cout<<"A";} }; class B: public A { public: void eat(){ cout<<"B";} }; class C: public A { public: void eat(){ cout<<"C";} }; class D: public B,C { public: void eat(){ cout<<"D";} }; int main(){ A *a = new D(); a->eat(); } I am not sure this is called diamond problem or not, but why doesn't this work? When I said, a->eat() (remember eat() is not virtual), there is only one possible eat() to call, that of A. Why then, do I get this error: 'A' is an ambiguous base of 'D'

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  • IE8 AJAX GET setRequestHeaders not working unless params provided in URL

    - by bobthabuilda
    I'm trying to create an AJAX request in IE8. var xhr = new ActiveXObject( 'Msxml2.XMLHTTP' ); xhr.open( 'GET', '/ajax/' ); // Required header for Django to detect AJAX request xhr.setRequestHeader( 'X-Requested-With', 'XMLHttpRequest' ); xhr.onreadystatechange = function() { if ( this.readyState == 4 ) console.log(this.responseText); } xhr.send( null ); This works perfectly fine in Firefox, Chrome, Safari. In IE8 however, all of my AJAX test requests work EXCEPT for ones where I'm performing GETs without any query string params (such as the one above). POSTs work without question, and GET requests only work whenever I include query strings in the URL, like this: xhr.open( 'GET', '/ajax/?foo=bar' ) I'm also 110% positive that my server code is handling these requests appropriately, so, this stumps me completely. Does anyone have any clue as to what might be causing this?

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  • Algorithm to determine thread "hotness"

    - by nickf
    I'm trying to come up with a way to determine how "hot" certain threads are in a forum. What criteria would you use and why? How would these come together to give a hotness score? The criteria I'm thinking of include: how many replies how long since the last reply average time between replies The problems this algorithm must solve: A thread which has 500 replies is clearly hot, unless the last reply was over a year ago. A thread with 500 replies that was replied to a second ago is clearly hot, unless it's taken 4 years to reach 500 replies. A thread with 15 replies in the last 4 minutes is really hot! Any ideas, thoughts or complete solutions out there?

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  • iPad Orientation Paradigm

    - by JustinXXVII
    I'm not a super awesome designer so this new paradigm has me a little cranky. The iPad is not supposed to have a standard orientation, and should/shall display screen contents at whichever orientation the user decides. This has me sort of stumped. I can keep my UI designed the way I want it in landscape mode, but switching to portrait, I just can't determine the best way to present app content. I know it's all speculation at this point, but what are the chances we can override the autoRotateToOrientation to only include the orientation of our choice? Apple ignored the HIG on a lot of issues for iPhone, including splash screens, saving state, etc. I know we can't really argue with Apple, but doesn't it sound slightly ridiculous to reject an app because it won't rotate to portrait? I've come a long way porting some code to iPad and it works great in landscape mode. I guess only time will tell. What do you all think?

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  • Can HTTP URIs have non-ASCII characters?

    - by Cheeso
    I tried to find this in the relevant RFC, IETF RFC 3986, but couldn't figure it. Do URIs for HTTP allow Unicode, or non-ASCII of any kind? Can you please cite the section and the RFC that supports your answer. NB: For those who might think this is not programming related - it is. It's related to an ISAPI filter I'm building. Addendum I've read section 2.5 of RFC 3986. But RFC 2616, which I believe is the current HTTP protocol, predates 3986, and for that reason I'd suppose it cannot be compliant with 3986. Furthermore, even if or when the HTTP RFC is updated, there still will be the issue of rationalization - in other words, does an HTTP URI support ALL of the RFC3986 provisos, including whatever is appropriate to include non US-ASCII characters?

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  • Using FourSquare API in a Rails App

    - by MikeH
    Anybody have any good resources that might be helpful in trying to integrate the FourSquare API into a Rails app? I'm specifically looking for a good tutorial. There doesn't seem to be much out there yet. There are a few ruby gems, but they are pretty bare bones and I need a bit more hand-holding. Here is a resource that I've found so far: http://tedgrubb.com/ Stack Overflow won't let me include a second hyperlink, but you can also google: Foursquare ruby gem for another resource. I have not done much work with APIs in the past, but I am very comfortable with Rails. What I need is a little better sense of exactly where all the pieces fit. A basic tutorial is what I'm looking for. Thanks.

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  • How does Entity Framework 4.0 determine which parameters are required for the factory method of an e

    - by Scott Davies
    Hi, I am working with Entity Framework 4.0 (VS 2010 Beta 2, NOT RC). I can model the EDM and produce the required database. When I ask VS to generate the code for the model, it generates the expected .designer.cs file. When I look at the factory methods for each entity that the designer has generated, I've noticed that it doesn't include all of the properties of the entity. Is it correct to say that the factory method only includes properties that cannot be null ? This appears to be the case, but I'm not entirely sure. Thanks, Scott

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  • Unable to read .rtf file in VS.NET 2008 Setup

    - by constant learner
    Hello All I have created a simple windows application in .NET 2008. Im packaging the same into a setup file using .NET Setup and Deployment. Also i am customizing it to include a License Agreement UI. And i am pointing the License Agreement window to read the license.rtf file which is being included in the Application folder. After successful build, if i run the setup file i can see the License Agreement window but i cannot see the content of my file. Any ideas what is the issue behind this ? Regards CL

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  • What did I lose when I upgraded?

    - by Richard
    I upgraded my work box from Vista64 to Win7-64 by doing a format and reinstall. I kept backups of the project done in MS Visual Studio 2008 (Team). But now it won't compile. I am getting errors generated on lines in the MS created header files like "'_In_' not defined" etc. I know it is because I lost some compiler setting/directive. I was sure that the compiler settings would be in the project file; now I see that things like the include file directories, LIB files, etc. are not. [FYI: The project is a VB.NET GUI with VC++ DLL talking to a PIC24 micro over USB.] How do I most efficiently get my project back on the road to execution?

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  • Inline & not-inline

    - by anon
    Suppose I have: struct Vec3 { double x; double y; double z; } ; inline double dot(const Vec3& lhs, const Vec3& rhs) { return lhs.x * rhs.x + lhs.y * rhs.y + lhs.z * rhs.z ; } Is it possible to have "dot" also exist in a non-inlined version, so that it can be in the *.so , so that when I dl open it I can call it? I.e. I want files that include the above header to use the inlined version, but I also want the function to exist in a *.so, so I can dl open it and call it dynamically.

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  • Correct way to get absolute url in django

    - by dreamiurg
    A problem that I stumbled upon recently, and, even though I solved it, I would like to hear your opinion of what correct/simple/adopted solution would be. I'm developing website using Django + python. When I run it on local machine with "python manage.py runserver", local address is http://127.0.0.1:8000/ by default. However, on production server my app has other url, with path - like "http://server.name/myproj/" I need to generate and use permanent urls. If I'm using {% url view params %}, I'm getting paths that are relative to / , since my urls.py contains this urlpatterns = patterns('', (r'^(\d+)?$', 'myproj.myapp.views.index'), (r'^img/(.*)$', 'django.views.static.serve', {'document_root': settings.MEDIA_ROOT + '/img' }), (r'^css/(.*)$', 'django.views.static.serve', {'document_root': settings.MEDIA_ROOT + '/css' }), ) So far, I see 2 solutions: modify urls.py, include '/myproj/' in case of production run use request.build_absolute_uri() for creating link in views.py or pass some variable with 'hostname:port/path' in templates Are there prettier ways to deal with this problem? Thank you.

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  • Can we use spring FTL based form validations with any controller other than SimpleFormController

    - by Adhir Aima
    Hi, Because of some design specification we have to extend all controllers in spring MVC from a class that extends AbstractCommandController. I am trying to include the spring FTL based form validations in my FTL file, but it gives me an error like Method public org.springframework.web.servlet.support.BindStatus org.springframework.web.servlet.support.RequestContext.getBindStatus(java.lang.String) throws java.lang.IllegalStateException threw an exception when invoked on org.springframework.web.servlet.support.RequestContext@b05cd7 with arguments of types [java.lang.String,] The problematic instruction: == assignment: status=springMacroRequestContext.getBindStatus(path) [on line 120, column 9 in spring.ftl] in user-directive spring.bind [on line 47, column 33 in myProfile.ftl] Java backtrace for programmers: freemarker.template.TemplateModelException: Method public org.springframework.web.servlet.support.BindStatus org.springframework.web.servlet.support.RequestContext.getBindStatus(java.lang.String) throws java.lang.IllegalStateException threw an exception when invoked on org.springframework.web.servlet.support.RequestContext@b05cd7 with arguments of types [java.lang.String,] I have put the command name properly in the controller class and in the controller class, neither the specified name nor the default "command" works. Some help please. And would be much appreciated if it comes with an example. Thanks in advance, Adhir Aima

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  • Rendering spatial data of GeoQuerySet in a custom view on GeoDjango

    - by dmytro
    Hello. I have just started my first project on GeoDjango. As a matter of fact, with GeoDjango powered Admin application we all have a great possibility to view/edit spatial data, associated with the current object. The problem is that after the objects having been populated I need to render several objects' associated geometry at once on a single map. I might implement it as a model action, redirecting to a custom view. I just don't know, how to include the OpenLayers widget in the view and how to render there my compound geometry from my GeoQuerySet. I would be very thankful for any hint from an experienced GeoDjango programmer.

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  • QT creator/qt embedded widget demo problem

    - by jhowland
    I have downloaded the source code for the embedded widget demos from nokia and tried to get it to compile--I end up with the following error: Compiler (mingw32) message : In file included from ../../src/basicgraph/qtbasicgraph.cpp:9: ../../src/basicgraph/qtbasicgraph.h:14:17: QtGui: No such file or directory The offending line is #include <QtGui> QT creator 1.2.0, QT 2009.03 I have checked paths, etc, and all seems fine. I have checked to make sure that I have implicitly included QT += gui and that I have NOT included QT -= gui anywhere in the .pro and .pri files. After making no changes, I used VS2005 and the appropriate commercial version of QT 4.4.3, and it compiled and ran fine I have googled the error, and have found others asking similar questions (but not here) but no posted answers...so I would appreciate any help. thanks Jonathan Howland

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  • Making a DateTime field in SQLExpress database?

    - by Mike
    I'm putting together a simple test database to learn MVC with. I want to add a DateTime field to show when the record was CREATED. ID = int Name = Char DateCreated = (dateTime, DateTime2..?) I have a feeling that this type of DateTime capture can be done automatically - but that's all I have, a feeling. Can it be done? And if so how? While we're on the subject: if I wanted to include another field that captured the DateTime of when the record was LAST UPDATED how would I do that. I'm hoping to not do this manually. Many thanks Mike

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  • Domain driven design value object, how to ensure a unique value

    - by Darren
    Hi, I am building a questionnaire creator. A questionnaire consists of sections, sections consist of pages and pages consist of questions. Questionnaire is the aggregate root. Sections, pages and questions can have what are called shortcodes which should be unique within a questionnaire (but not unique within the database hence they are not strictly an identity). I intended to make the shortcode a value object and wanted to include the business rule that it should be unique within the questionnaire but I am unsure how to ensure that. My understanding is that the value object should not access the repository or service layer so how does it find out if it is unique? Thanks for any help. Darren

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  • Architectural advice on connecting multiple diverse sites into a single community.

    - by Aleksandar
    Hi SO, I've been given a task to connect multiple sites of the same client into a single network. So i would like to hear an architectural advice on connecting these sites into a single community. These sites include: 1. Invision Power Board Forum (the most important site) 2. 3 custom made cms-s (changes to code allowable) 3. 1 drupal site 4. 3-4 wordpress blogs Requirements are as follows: 1. Connecting all users of all sites into a single administrable entity. With permissions changing ability, users banning etc. 2. Later on, based on this implementation I have to implement "facebook like" chat, which will be available to all users regardless of place of login. I have few ideas on my mind on how to go with this, but would like to hear some people with more experience and expertize than my self. Cheers!

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  • NO-SQL reliable for small bussines app?

    - by mamcx
    I'm deciding between go for a NON-SQL engine or a regular SQL one for a document managment system for small bussines. I have experience with firebird/sql server and found a good track of reliability (specially with firebird). This market is full of crappy "servers" (clon-made PC, the mayority), cheap harddisk, rarely use of RAID or anything like that, some are in locations where a power-off is normal, some not have a UPS, etc... (I will include off-site auto-backup to external servers, but that no change the internal setup). (I know about end-user education about such proper setups, but is stupid depend on that, so stick to te point) From the desing point of view, a schema-less database is the way to go for my system, but, I worry if any of the actual solutions (MongoDb, Tokyo Cabinet, etc) are like firebird and survice crash, malfunctions & abuse so data corruption is very rare. The plan is store the office documents there & provide a central repository.

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