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• Is deriving square from rectangle a violation of Liskov's Substitution Principle?

  - by somaraj

  I am new to design and learning the design principles. It says deriving square from rectangle is a classic example of violation of Liskov's Substitution Principle. If that's the case, what should be the correct design?

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• Exclude specific filename from shell globbing

  - by Alsciende

  Hi, I want to excluse a specific filename (say, fubar.log) from a shell (bash) globbing string, *.log. Nothing of what I tried seems to work, because globbing doesn't use the standard RE set. Test case : the directory contains fubar.log fubaz.log barbaz.log text.txt and only fubaz.log barbaz.log must be expanded by the glob.

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• Rescuing redirect :back after destroy in Rails?

  - by Andreas

  I'm looking for a best practice solution to be able to keep using redirect :back after a successful destroy action, as many items can be deleted from a variety of listings. Unfortunately that strategy fails for the one case when the delete is initiated from the item view itself. What approach do you recommend for this situation?

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• Self referential type

  - by pythonic metaphor

  What type T makes the following code compilable? T f(){ return &f; } I'd prefer a C answer, but I marked the question as C and C++ in case there is only an answer using templates.

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• tor api in own project

  - by Ockonal

  Hello, I'm going to develop gui-based application for tor controlling (like vidalia or torK). Are there any libraries for using tor? I don't want to parse each byte of information from sockets. My program should display branches of computers, use chosen as traffic-provider etc. What I need in my case? Are there any small and simple samples (for example open-source projects) to do this.

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• Paging in my web page

  - by Jibu P C_Adoor

  Hi, I have a large data set and i have to apply paging on that data set and after that the result set should be another data set. What is the reliable method to achieve that. I have tried with 'PagedDataSource' class but i don't know how it is possible to convert to dataset or data table. In my case i need a general solution. I have to bind to a control like gridview as well as i have to used it with normal html table.

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• Is it a bug in Ecmascript - /\S/.test(null) returns true ?

  - by Lauri

  Both in Actionscript3 and Javascript these statements give the same result: /\S/.test(null) = true /null/.test(null) = true /m/.test(null) = false /n/.test(null) = true Seems that null value is converted into string "null" in this case. Is this a known bug in Ecmascript or am I missing something?

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• What is the point of function pointers?

  - by gramm

  Hi, I have trouble seing the utility of the function pointers. I guess it may be useful in some cases (they exist, after all), but I can't think of a case where it's better or unavoidable to use a function pointer. Could you give some example of good use of function pointers (in C or C++)? Many thanks :)

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• How do I declare a constructor for an 'object' class type in Scala? I.e., a one time operation for the singleton.

  - by Zack

  I know that objects are treated pretty much like singletons in scala. However, I have been unable to find an elegant way to specify default behavior on initial instantiation. I can accomplish this by just putting code into the body of the object declaration but this seems overly hacky. Using an apply doesn't really work because it can be called multiple times and doesn't really make sense for this use case. Any ideas on how to do this?

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• Recommended book for Sql Server query optimisation

  - by Patrick Honorez

  Even if I have made a certification exam on Sql Server Design and implementation , I have no clue about how to trace/debug/optimise performance in Sql Sever. Now the database I built is really business critical, and getting big, so it is time for me to dig into optimisation, specially regarding when/where to add indexes. Can you recommend a good book on this subject ? (smaller is better :) Just in case: I am using Sql Server 2008. Thanks

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• Django: auto minifying css/js files before release

  - by Dzida

  Hi, I have following case: I want to use uncompressed js/css files during development (to debug js for example) but on production I want to switch automatically to minified versions of that files. some simple solution is to put in your template: <script src="some_js.{% if not debug %}min.{% endif %}js".... but this require manully providing that such file exist and to do minifaction manullay after original file change. How do you accomplish this in your projects? Is there any tool for this?

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• Task Manager with Trac support for Mac

  - by Dmitry

  Found Mylyn as a very good task manager that supports Trac and Gmail Task. I've seen Tasktop, but looking for something with smaller memory footprint that I could always run in background. Is there any lighter client (not on Eclipse platform) to manager at least Trac tasks (via XML-RPC) and in best case scenario with GMail Tasks support?

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• Flexible array member in C-structure

  - by Arpan

  Quoting from the C-std section 6.7.2.1, struct s { int n; double d[]; }; This is a valid structure declaration. I am looking for some practical use of this kind of syntax. To be precise, how is this construct any more or less powerful than keeping a double* as the 2nd element? Or is this another case of 'you-can-do-it-in-multiple-ways'? Arpan

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• When to use dictionaries?

  - by RHaguiuda

  I`m not really sure when I should use a dictionary in my applications. Everytime I code a switch case that returns a single value, for example, should I strive for a dic? Thanks

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• GdkEventKey. Key value question

  - by spajak

  Hi How to translate GdkEventKey.keyval with level 0 to key value with level == 0? For example: GDK_ISO_Left_Tab ==> GDK_Tab? Of course not using switch/case for every key. I need to get particular key, not a character.

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• Why do breakpoints sometimes not work in visual c++ 2008 express?

  - by superuser

  What's the root cause? I can't reproduce it,but sometimes the breakpoint can't let the programme pause. Has anyone else ever step into this case?

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• Unicode Kangxi radicals range 2F00–2FDF not displayed on iphone device, but in simulator

  - by sadfadfasd

  Hi, Kangxi radicals in the range 2F00-2FDF (see link text) are not displayed correctly on the iPhone device. They appear as a crossed-out box. In the simulator they display correctly. I tried the system font and also the [UIFont fontWithName:@"STHeitiTC-Medium" size:24]; ... Is the unicode codepoint coverage limited on the iphone (in my case OS 3.1.3)? How to make those radicals appear??? Thx

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• working with android intents how to pass arguments between father and the intent h in

  - by yoavstr

  assuming i want to open another activity from my current activty and i want to pass her arguments such as in my case diffculty level how i do it?... newGameButton.setOnClickListener(new OnClickListener() { public void onClick(View view) { Intent i = new Intent(countryCityGameMenu.this,GameScreen.class); startActivityForResult(i, GlobalDataStore.STATIC_INTEGER_VALUE); } }); is there a way to pass those arguments in the calling ?... thankx

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• Create Hidden Windows file/folder from Linux

  - by what4893

  Is it possible to create a file on a mounted SMB share that is hidden from Windows? The .(dot) prefix doesn't work in this case because that only works on Linux. Basically I'm looking for the same affect as using attrib +h on Windows, but under Linux.

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• Preferred Access point name

  - by rantravee

  Hi, I'm hoping that someone will explain to me what preferred access point name refers to in the android system , and what is it's role . Also I'd like to know if by messing with all APN (adding a suffix to the "apn" and "type" fields to disable 3G/EDGE/GPRS connections , and the deleting this suffix ) , the preferred APN can be disrupted. Also if it need special settings in case an APN manipulation is desired.

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• Check directory for files, retrieve first file

  - by Lowgain

  I'm writing a small ruby daemon that I am hoping will do the following: Check if a specific directory has files (in this case, .yml files) If so, take the first file (numerically sorted preferrably), and parse into a hash Do a 'yield', with this hash as the argument What I have right now is like: loop do get_next_in_queue { |s| THINGS } end def get_next_in_queue queue_dir = Dir[File.dirname(__FILE__)+'/../queue'] info = YAML::load_file(queue_dir[0]) #not sure if this works or not yield info end I'd like to make the yield conditional if possible, so it only happens if a file is actually found. Thanks!

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• How to recognize external hard drive from all local drives in .NET Framework?

  - by biajee

  I've already tried System.IO.DriveType. But it only provides to me with the information of whether it's a removable drive such as floppy disc or a USB flash drive. And a USB external hard drive will be recognized as a local non-removable drive in this case. Furthermore, since there are more than one kinds of external hard drive, for example, USB and IEEE 1394. It's really hard to figure it out from ports. Any information will be appreciated.

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• Compiling in g++ for gprof

  - by myahya

  I do not understand the documentation for gprof regarding how to compile your program for profiling with gprof. In g++, is it required to compile with the -g option (debugging information) in a addition to the -pg option or not. In each case I get different results, and I would like to see where the bottlenecks in my application are in release mode, not in debug mode, where many optimizations are left out by the compiler (e.g. inlining)

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• Python `if x is not None` or `if not x is None`?

  - by orokusaki

  I've always thought of the if not x is None version to be more clear, but Google's style guide implies (based on this excerpt) that they use if x is not None. Is there any minor performance difference (I'm assuming not), and is there any case where one really doesn't fit (making the other a clear winner for my convention)?* *I'm referring to any singleton, rather than just None. ...to compare singletons like None. Use is or is not.

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• how long it takes for kernel handles to close by Windows when an application crashes

  - by user314772

  I know Windows close kernel handles when an application crashes, but if I want to wait on this event, can I be sure it will happen in milisec or it might take a while? I would like to trigger a new function the moment one application is crashed and I'm checking if this handle is NULL but it seems like I can't get a NULL value in this case.

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