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• Should I use a modified singleton design pattern that only allows one reference to its instance?

  - by Graham

  Hi, I have a class that would normally just generate factory objects, however this class should only used once throughout the program in once specifix place. What is the best design pattern to use in this instance? I throught that having a modified singleton design which only allows one reference to instance throughout the program would be the correct way to go. So only the first call to getInstance() returns the factory library. Is this a good or bad idea? Have I missed out another fundermental design pattern for solving this problem? Thanks for your help.

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• Which libraries use the "We Know Where You Live" optimization for std::make_shared?

  - by KnowItAllWannabe

  Over two years ago, Stephan T. Lavavej described a space-saving optimization he implemented in Microsoft's implementation of std::make_shared, and I know from speaking with him that Microsoft has nothing against other library implementations adopting this optimization. If you know for sure whether other libraries (e.g., for Gnu C++, Clang, Intel C++, plus Boost (for boost::make_shared)) have adopted this implementation, please contribute an answer. I don't have ready access to that many make_shared implementations, nor am I wild about digging into the bowels of the ones I have to see if they've implemented the WKWYL optimization, but I'm hoping that SO readers know the answers for some libraries off-hand. I know from looking at the code that as of Boost 1.52, the WKWYL optimization had not been implemented, but Boost is now up to version 1.55. Note that this optimization is different from std::make_shared's ability to avoid a dedicated heap allocation for the reference count used by std::shared_ptr. For a discussion of the difference between WKWYL and that optimication, consult this question.

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• How to implement/debug a sensor driver in ANDROID

  - by CVS-2600Hertz-wordpress-com

  Does anyone know of a walk-through or any examples of any code to setup sensors in android. I have the drivers available to me. Also i have implemented the sensors library as instructed in the Android-Reference along the sensors.h template. I am still unable to get any response at the apps level. How do i trace this issue? what might be the problem? Thanks in advance UPDATE: Jorgesys's link below points to a great APP to test if the sensor drivers are functioning properly or not. Not that i know they are not functioning, Any ideas of on where to dig??...

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• Bit conversion operations in PHP

  - by Goro

  Hello, I find myself in need of performing bit-level conversion on variables in PHP. In more detail, I have a bit stream that is read as an integer by hardware, and I need to do some operations on the bits to make it into what its actually supposed to be (a float). I have to do this a few times for different formats, and the functionality I need is Being able to select and move individual bits in a variable Being able to cast statically one type of variable to the other (ie. int to float) I know php natively supports bitwise AND, OR, etc, and shift operations, but I was wondering if: there may already be a library in php that does this sort of thing I would be better off with delegating the calculations to some other language Thanks,

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• Calculating very large exponents in python

  - by miraclesoul

  Dear All, Currently i am simulating my cryptographic scheme to test it. I have developed the code but i am stuck at one point. I am trying to take : g**x where g = 256 bit number x = 256 bit number Python hangs at this point, i have read alot of forums, threads etcc but only come to the conclusion that python hangs, as its hard for it to process such large numbers. any idea how can it be done? any two line piece of code, any library, anything that can be done.(ALSO PLEASE I AM A NEW PYTHON USER AND THIS IS FIRST TIME I DID PROGRAMMING IN IT, SO NO COMPLEX METHODS ...HOPE YOU UNDERSTAND :s)

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• Crypto++ AES Decrypt how to?

  - by indigoOrange

  There are next to no noob guides to crypto++ out there. Or none that I've found anyway. What I want to do is decrypt an array of uchars I generate with another AES encrypter. Where would I start? I have the library built and linking grand. Do I need to set anything up or do I just call a function on my array (and if so what function) ? I'd really appreshiate some help from someone who knows this stuff. Thanks

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• Copying web part pages within SharePoint

  - by Jasper

  Hi, I'm trying to copy some web part pages (aspx) from one library into another. Reason is that I've got sites which are created dynamiccally. I also want to add some content (based on several rules) to those sites, which include aspx web part pages. The deployment works fine, but the web part pages are empty in the target site. As I've read in several blog posts, this has something to do with the ghosting of the files. Is there a way to literally copy all of the content in the ASPX to the site? The webparts aren't site or feature dependant, so the pages should work on every site. When I copy the pages with SPD, it works fine, but I don't understand how SPD does this.

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• Gaining application/module context from a symfony task

  - by Martin Chatterton

  I have written a reporting suite, and I have a specific report that builds a CSV file. Serving this file via a browser on demand isn't an issue, but I need to be able to build this CSV file nightly, and email round a link to be able to download it. Essentially, I need to be able to replace a specific action with a symfony task, run via cron. So how do I gain application/module context from a symfony task? And secondly, how would I invoke the SwiftMailer library from a symfony task? I'm using symfony v1.4.4 and PHP v.5.2.13. Thanks in advance for your help.

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• Is there a way of providing a final transform method when chaining operations (like map reduce) in underscore.js?

  - by latentflip

  (Really strugging to title this question, so if anyone has suggestions feel free.) Say I wanted to do an operation like: take an array [1,2,3] multiply each element by 2 (map): [2,4,6] add the elements together (reduce): 12 multiply the result by 10: 120 I can do this pretty cleanly in underscore using chaining, like so: arr = [1,2,3] map = (el) -> 2*el reduce = (s,n) -> s+n out = (r) -> 10*r reduced = _.chain(arr).map(map).reduce(reduce).value() result = out(reduced) However, it would be even nicer if I could chain the 'out' method too, like this: result = _.chain(arr).map(map).reduce(reduce).out(out).value() Now this would be a fairly simple addition to a library like underscore. But my questions are: Does this 'out' method have a name in functional programming? Does this already exist in underscore (tap comes close, but not quite).

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• How do I compile and run this gtk programe using CMAKE in windows?

  - by user198729

  #include <gtk/gtk.h> int main( int argc, char *argv[] ) { GtkWidget *window; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_widget_show (window); gtk_main (); return 0; } The above is from here: http://library.gnome.org/devel/gtk-tutorial/stable/c39.html But I want to use cmake to compile/run it(supposing gtk has been properly installed). Can someone provide a demo?

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• memcached cluster maintenance

  - by Yang

  Scaling up memcached to a cluster of shards/partitions requires either distributed routing/partition table maintenance or centralized proxying (and other stuff like detecting failures). What are the popular/typical approaches/systems here? There's software like libketama, which provides consistent hashing, but this is just a client-side library that reacts to messages about node arrivals/departures---do most users just run something like this, plus separate monitoring nodes that, on detecting failures, notify all the libketamas of the departure? I imagine something like this might be sufficient since typical use of memcached as a soft-state cache doesn't require careful attention to consistency, but I'm curious what people do.

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• A Combinations of Items in Given List

  - by mecablaze

  Hello stackoverflow, I'm currently in Python land. This is what I need to do. I have already looked into the itertools library but it seems to only do permutations. I want to take an input list, like ['yahoo', 'wikipedia', 'freebase'] and generate every unique combination of one item with zero or more other items... ['yahoo', 'wikipedia', 'freebase'] ['yahoo', 'wikipedia'] ['yahoo', 'freebase'] ['wikipedia', 'freebase'] ['yahoo'] ['freebase'] ['wikipedia'] A few notes. Order does not matter and I am trying to design the method to take a list of any size. Also, is there a name for this kind of combination? Thanks for your help!

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• Help need for openfast implementation

  - by ganuke

  Our stock exchange going to implement FAST messaging in their system in order to reduced the bandwidth usage. We have already implement the FIX based application to trade with Stock exchange. In future we need implement FIX FAST in our application to communicate with them. I found that OPEN FAST is FAST based library. But I do not have any idea how to start with it. I went through OpenFast web site but could not find much support on how to use templates and dictionaries. Can some one guide me or provide some resources to start with? Thanks in advance.

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• ConnectJDBCDataStoreHelper Jar File

  - by adisembiring

  Hi ... I'm trying to create mysql datasource in websphere. I have setup the data source and test the data source from the admin console. I used ConnectJDBCDataStoreHelper as datasource helper. Now, I'm trying to access the datasource from desktop application using Hibernate. I've set the JNDI URL, ContextFactory and etc. And I have reference was 7 library in my project. While I try to run, there are some error occurred. com.ibm.websphere.rsadapter.ConnectJDBCDataStoreHelper not found.

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• Is there an easy way in Python to wait until certain condition is true?

  - by Checkers

  I need to wait in a script until a certain number of conditions become true? I know I can roll my own eventing using condition variables and friends, but I don't want to go through all the trouble of implementing it, since some object property changes come from external thread in a wrapped C++ library (Boost.Python), so I can't just hijack __setattr__ in a class and put a condition variable there, which leaves me with either trying to create and signal a Python condition variable from C++, or wrap a native one and wait on it in Python, both of which sound fiddly, needlessly complicated and boring. Is there an easier way to do it, barring continuous polling of the condition? Ideally it would be along the lines of res = wait_until(lambda: some_predicate, timeout) if (not res): print 'timed out'

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• Why is glpk-java.jar not the same across all platforms?

  - by pruefsumme

  I'm using glpk-java in one of my projects. It provides a JNI to GLPK, a free LP/MIP solver. To use it under different platforms, you need different shared libraries (libglpk.so under Linux, libglpk.dylib under Mac OS X, glpk.dll under Windows) which is fully understandable. In addition, a java library is needed: glpk-java.jar. It's created as part of the build process. I was wondering why this JAR file (which only contains .class files) is different under different platforms? I.e., I cannot use the same glpk-java.jar under Linux and Mac OS X which means that I cannot put this file under revision control.

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• why don't more programming languages have builtin interfaces to the window manager?

  - by Naveen

  Programming is at the heart about automating tasks on a computer. Presumably those tasks would normally be done manually by a human. Humans use the computer through the keyboard, mouse, and interaction with the console or the window manager. But very few languages have built in functions that provide an interface to these basic computing objects. A notable exception is autohotkey, an open source language on windows, providing builtin functions that allow the following simple tasks: * Get Pixel Information * Get mouse position * Keyboard macros * Simulate key strokes * Simulate mouse click * Window management See examples on rosettacode. There have been various attempts on linux, many of which were stopped without explanation. One is the inactive tcl library: android. Search google code for android, lang:tcl

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• EntityFramework gives IDisposable error

  - by Snoop Dogg

  I use EF for the back-end DataLayer in my asp.net websites. I create a class library and add the Model in it, reference it and use it from the ASP.NET Website. But this time, I generated the model from database but it seems does not implement IDisposable, and the methods I used to see are not there. DeleteObject , SaveChanges etc. There are only Two tables in the DB and the Model was generated with only the TableSets and two methods AddToTableSet ... Had anybody encountered such a problem?

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• simple putStrLn in Haskell/Yampa with arrows syntax

  - by sisif

  i'm using Haskell with the Yampa FRP library which uses the arrows language extension. how can i do a simple putStrLn in a SF? mySF = proc x -> do y <- identity -< x*x putStrLn "Hello World!" ++ show y returnA -< y the arrow syntax complains about the expression not bein an arrow (of course), but even with arrows i get no output output <- identity -< putStrLn "Hello World!"

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• Make multiple targets in 'all'

  - by Hiett

  i'm trying to build a debug and release version of a library with a Makefile and copy those libraries to the relevant build directories, e.g. .PHONY: all clean distclean all: $(program_NAME_DEBUG) $(CP) $(program_NAME_DEBUG) $(BUILD_DIR)/debug/$(program_NAME_DEBUG) $(RM) $(program_NAME_DEBUG) $(RM) $(program_OBJS) $(program_NAME_RELEASE) $(CP) $(program_NAME_RELEASE) $(BUILD_DIR)/release/$(program_NAME_RELEASE) $(RM) $(program_NAME_RELEASE) $(RM) $(program_OBJS) $(program_NAME_DEBUG): $(program_OBJS) $(LINK_DEBUG.c) -shared -Wl,-soname,$(program_NAME_DEBUG) $(program_OBJS) -o $(program_NAME_DEBUG) $(program_NAME_RELEASE): $(program_OBJS) $(LINK_RELEASE.c) -shared -Wl,-soname,$(program_NAME_RELEASE) $(program_OBJS) -o $(program_NAME_RELEASE) The 1st target in all (program_NAME_DEBUG) compiles OK but the 2nd, (program_NAME_RELEASE) produces the following error: libGlamdring_rel.so make: libGlamdring_rel.so: Command not found make: *** [all] Error 127 libGlamdring_rel.so is the value of program_NAME_RELEASE It doesn't seem to be recognising the 2nd target as it does the 1st?

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• qTip with jQuery dialogs

  - by MikeWyatt

  I'm using qTip to show validation errors in a grid. The tooltip appears after a failed row save and doesn't disappear until the row is resaved or the changes are canceled. The problem with this is that opening a dialog while the tooltip is visible causes the tooltip to be rendered on top of the dialog. That is because the z-index is hard-coded to 6000+ for all tooltips, while jQuery dialogs are set to 1000+. I could fix this problem by changing the hard-coded value in qTip to <1000, but then tooltips fired from the dialog will appear behind the dialog. Is there anything I can do, aside from changing the qTip code or using a different tooltip library?

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• VS2005 Compilation Problem with Settings

  - by vijay.j

  I am trying to integrate PJNSMTPCONNECTION CLASSES in my project; they say that those classes do not use MFC. My project is with the setting like MT, and using standard library linking. When I try to compile, I am getting CSTRING not defined and fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include <windows.h> If I include afx.h and remove windows.h, I am getting iDLLMain already defined errors. How do I resolve these problems, please?

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• How can I program ksh93 to use bash autocompletion?

  - by Norman Ramsey

  In a comment in response to a shell question, user tinkertim said that it was easy to hack ksh to use the bash autocompletion library. I would like nothing better than to use bash autocompletion with AT&T ksh93. How can this be done? ksh93 has a new release several times a year, so I am looking for a solution that does not involve modifying the source code. ksh93 can link new C modules dynamically and also is highly programmable (I run a ksh function at every keystroke), so modifying the source should not really be necessary. Note: I am not talking about filename autocompletion, which is easy to do in ksh. I'm talking about all the other yummy autocompletion stuff that bash does, like autocompletion options for nmh commands or autocompleting Mercurial commmands. Stuff like that.

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• Cache an FTP connection via session variables for use via AJAX?

  - by Chad Johnson

  I'm working on a Ruby web Application that uses the Net::FTP library. One part of it allows users to interact with an FTP site via AJAX. When the user does something, and AJAX call is made, and then Ruby reconnects to the FTP server, performs an action, and outputs information. Every time the AJAX call is made, Ruby has to reconnect to the FTP server, and that's slow. Is there a way I could cache this FTP connection? I've tried caching in the session hash, but "We're sorry, but something went wrong" is displayed, and a TCP dump is outputted in my logs whenever I attempt to store it in the session hash. I haven't tried memcache yet. Any suggestions?

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• Useless variable name in C struct type definition

  - by user1210233

  I'm implementing a linked list in C. Here's a struct that I made, which represents the linked list: typedef struct llist { struct lnode* head; /* Head pointer either points to a node with data or NULL */ struct lnode* tail; /* Tail pointer either points to a node with data or NULL */ unsigned int size; /* Size of the linked list */ } list; Isn't the "llist" basically useless. When a client uses this library and makes a new linked list, he would have the following declaration: list myList; So typing llist just before the opening brace is practically useless, right? The following code basically does the same job: typedef struct { struct lnode* head; /* Head pointer either points to a node with data or NULL */ struct lnode* tail; /* Tail pointer either points to a node with data or NULL */ unsigned int size; /* Size of the linked list */ } list;

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