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• What exactly is the point of tableView:sectionForSectionIndexTitle:atIndex: ?

  - by mystify

  The documentation is not really clear about this. Why is the UITableViewDataSource asked to provide the section index for an index-bar section title? I mean... what use cases make this method important? When is this called and why?

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• Machine Dependent versus Machine Independent languages

  - by Maxood

  Why might you want to write a program in a machine independent language instead of a machine- dependent language? Why might a machine-dependent language be more appropriate for writing certain types of programs?

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• DCOMCNFG Question...

  - by Tony

  Hello, I have a COM DLL that I registered via RegSvr32 but it does not show up in DComCnfg. Any help as to why? I think I am missing a few registry keys, but I do not understand why I would, i thought RegSvr32 did that for me. Thanks for any help.

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• Visual Sourcesafe, sharing: commits to wrong location

  - by Snake

  I have a project under my management. It has the following structure: $/Code/MainSolution $/Code/Branches I want to branch the MainSolution in $/Code/Branches So I do it, (it works perfectly), I set a working folder for that project and do a 'get latest'. But when I open that solution in Visual Studio 2005 it identifies every file as new (+ sign in front of the file) and when I commit it it goes to $/Data/NameOfTheBranch Why does it do that? Why doesn't it follow MY rules?

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• gem install permission problem

  - by qichunren

  qichunren@zhaobak:~ gem install hpricot ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions into the /opt/ruby-enterprise-1.8.7/lib/ruby/gems/1.8 directory. current ligin user is qichunren, and qichunre user have write permission with .gem dir.I would like to know why gem not install files into my home .gem dir first?????Why my gem common first want to install files into /opt/ruby-enterprise-1.8.7/lib/ruby/gems/1.8

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• Hibernate reverse engineering procedure generated @Temporal(TemporalType.TIMESTAMP) for DateTime

  - by EugeneP

  Fields in a DB were of type DATETIME (mysql). Why was it generated as a timestamp and will it be regenerated during object persistence? That is not a desired scenario in my case, seeing that as not a timestamp field means that it should only be set via setter, no generation needed, I dont really understand why it did not generate it as Date type!

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• MongoDB vs. Redis vs. Cassandra for a fast-write, temporary row storage solution

  - by Mark Bao

  Hi there, I'm building a system that tracks and verifies ad impressions and clicks. This means that there are a lot of insert commands (about 90/second average, peaking at 250) and some read operations, but the focus is on performance and making it blazing-fast. The system is currently on MongoDB, but I've been introduced to Cassandra and Redis since then. Would it be a good idea to go to one of these two solutions, rather than stay on MongoDB? Why or why not? Thank you

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• .net thread safety

  - by george9170

  Why is locking a type considered very bad? For example, lock(typeof(DateTime)) I understand that static methods of any class in .net is considered thread safe, and that instance members are not. So it isn't necessary to lock DateTime while you are using it. The book I am reading doesn't explain why it is bad it just says it is. Any explanation will be great.

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• UIpopover is presenting user with a 'done' button that I can't get rid of

  - by nickthedude

  I'm not sure why this is coming up I am porting my app into an ipad version and moving one of my views which happens to be a navigation controller into a uipopover. I did have a uibarbutton item on the view im porting with a "done" button to dismiss the navcontroller but I commented out that code and its still appearing, not sure why. I remember someone mentioning some versions of xcode are wonky with uipopovers anyone know which ones? im using 3.2.3

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• AS3 Classes - Should I use them?

  - by Eric

  I'm working on a project in Flash CS4/AS3 and I have a document class set up but I am wondering about using that, as opposed to frame-based scripting. Most of what I have seen so far deals with how to create them, but doesn't offer much about why or when to use them. I know I can also pull in other classes beyond the document class but, again, why and when? Could I get some input from you fine people out there on usage/best practice, etc? Thanks

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• bitwise not operator .

  - by Tony

  Why bitwise operation (~0); prints -1 ? In binary , not 0 should be 1 . why ?

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• javascript problems server side

  - by Ke

  Hi, I have a php script that uses some css/javascript tabs, they work on my local server but not when i upload to my online server. Just wondering if anyone knows why this might be the case? All the paths are correct, its basically an identical setup. I would be grateful to find out some reasons why the error appears on the server side, i thought javascript executed on the client side? Any help is much appreciated. Ke

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• What is wrong with this WHERE clause?

  - by Victor

  Is there a reason why this query doesn't work? The following query will work if I just exclude the WHERE clause. I need to know what is wrong with it. I know the given values of $key exists in the table, so why doesn't this work? $q = "SELECT * WHERE t1.project=$key FROM project_technologies AS t1 JOIN languages AS t2 ON t1.language = t2.key"; Table's have the following fields: project_technologies - key - project - language languages - key - name

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• Differences using JSON with MVC & MVC2?

  - by Dejan.S

  I recently started working with MVC or MVC2 to be more exact. I found a tutorial yesterday that was using JSON to populate a dropdowlist. Im not sure why this did not work with a MVC2 project and only with a MVC. Anybody got the time to just peep this site and maybe see what it might be? http://www.dotnetcurry.com/ShowArticle.aspx?ID=466. It's that JSON example, its homecontroler and the view code only I really want to know why thanks

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• IE8 doctype changing

  - by user303378

  I am currently using an XHTML 1.0 transitional doctype on my vBulletin website. The page in question is PHP. The source (view source) of this page verifies that the XHTML 1.0 transitional doctype is on the page. Upon downloading (File Save As) the page in IE8, I realized that my doctype had been replaced with an HTML 4.0 transitional doctype. Why does IE8 change the doctype? Why isn't the doctype its chosen displayed in the "View Source"?

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• Exception Specification

  - by atch

  Hi, guys I know that this feature will be depracated in c++0x, but for me as a total novice it seems like a good idea to have it. Could anyone explain to me why isn't a good idea? Thanks in advance. P.S. I know I've said it but I'll say it again: formating in this forum really pisses me off. Why can't I have ENTER as end of line but instead of I have to press space twice?

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• In a One to One relationship should i drop one of the table's id column?

  - by Vlad

  I have the following 2 tables in MySQL: Customer(Id, Firstname, Lastname...) Bonus(Id, CustomerId, Value, ...) The relation is One-To-One, every customer has only one bonus.(the CustomerId is unique in the Bonus Table) Q: Should I drop the Id column of the Bonus table? (I want to know why or why not)

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• Covariance in Java

  - by Bobby

  Why does the following not work in Java? It would work in C#: public static final List<String> Split(String str, char delimiter) { if ((str == null) || "".equals(str)) { return new CopyOnWriteArrayList<String>(); } } I get an error saying this method has to return List. CopyOnWriteArrayList implements the List interface. Why does covariance not apply on return values in Java?

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• matlab's phi symbol

  - by ldigas

  Not that significant, but annoying to no end. Why does matlab has no small phi (\varphi) symbol ? It has pretty much all other symbols LaTeX offers, but not this one. Why ? I may be wrong of course, in which case would be delighted if someone could prove me wrong...

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• Default template arguments for function templates

  - by Arman

  Why are default template arguments only allowed on class templates? Why can't we define a default type in a member function template? For example: struct mycclass { template<class T=int> void mymember(T* vec) { // ... } }; Instead, C++ forces that default template arguments are only allowed on a class template.

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• CSS "color" vs. "font-color"

  - by Fred Wilson

  Anyone know why CSS provides "color:" for text, but does not have "font-color:" or "text-color:"? Seems very counter-intuitive.. kind of like "text-decoration: bold" rather than "font-style: ". I must be new here. :o) Seriously, does anyone know why/how the w3c came up with such a wide array of CSS names like this?

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• Difference between the List and Enumeration

  - by harigm

  I have a written a method to get all the records and return in the List Type, but I got out of memory error. So I changed return type from List to Enumeration, in the method, instead of ArrayList, uses Vector and return vector.elements at the end of the method. It works without any error. but I did not understand why. Could someone explain Why this Enumeration worked?

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• Problem of instanceOf

  - by eric2323223

  Hi, could anyone tell me why this code won't compile? public boolean isOf(Class clazz, Object obj){ if(obj instanceof clazz){ return true; }else{ return false; } } Why I can't pass a class variable to instanceOf? Thanks in advance.

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• Is priority queue a non-linear data structure?

  - by Maxood

  If yes then why priority queue is a non-linear data structure? Does non-linear data sturctures are bad in performance as compared to linear ones? If yes then why? Please explain in detail.

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• Friend WithEvents in VB vs private in C#

  - by serhio

  Hello, friends Who knows, why in vb.net WinForm projects the designer by default use the Friend WithEvents attributes and in C# - private ones. By ex, in a form.designer. .cs private Label Label1; .vb Friend WithEvents Label1 as Label; For WithEvents is more or less clear(for using Handles, apparently). But why Friend in VB and private in C#... Thanks.

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