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• How common are circular references? Would reference-counting GC work just fine?

  - by user9521

  How common are circular references? The less common they are, the fewer hard cases you have if you are writing in a language with only reference counting-GC. Are there any cases where it wouldn't work well to make one of the references a "weak" reference so that reference counting still works? It seems like you should be able to have a language only use reference counting and weak references and have things work just fine most of the time, with the goal of efficiency. You could also have tools to help you detect memory leaks caused by circular references. Thoughts, anyone? It seems that Python uses references counting (I don't know if it uses a tracing collector occasionally or not for sure) and I know that Vala uses reference counting with weak references; I know that it's been done before, but how well would it work?

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• Strange problem with libc: undefined reference to `crypt'

  - by sorush-r

  I moved from Archlinux to Kubuntu 12.04 yesterday. I compiled buildroot 2012.08 on Archlinux without any problem. Though on Kubuntu libcrypt seems to be broken. sysvinit can't find it anywhere. glibc-dev and all dependencies are installed. How do I link to libcrypt? Or, which package containts that library? ... bc-gcc sulogin.o -o sulogin sulogin.o: In function `main': sulogin.c:(.text+0x49d): undefined reference to `crypt' collect2: ld returned 1 exit status

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• Generic Handler vs Direct Reference

  - by JNF

  In a project where I'm working on the data access layer I'm trying to make a decision how to send data and objects to the next layer (and programmer). Is it better to tell him to reference my dll, OR should I build a generic handler and let him take the objects from there (i.e. json format) If I understand correctly, In case of 2. he would have to handle the objects on his own, whereas in case 1. he will have the entities I've built. Note: It is very probable that other people would need to take the same data, though, we're not up to that yet. Same question here - should I make it into a webservice, or have them access the handler?

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• Should I worry about circular references in Python?

  - by bodacydo

  Suppose I have code that maintains parent/children structure. In such a structure I get circular references, where child points to parent and parent points to child. Should I worry about them? I'm using Python 2.5. I am concerned that they will not be garbage collected and the application will eventually consume all memory. Thanks, Boda Cydo.

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• JCarousel wrap set to 'circular' bug

  - by Scott

  I'm trying to set up a JCarousel instance witht the wrap set to circular, however, I noticed an issue where I "inspect element" in Chrome, duplicate elements are added to the html when the slides repeat (it can be viewed on the official example page). http://sorgalla.com/projects/jcarousel/examples/static_circular.html I know this is an open bug on GitHub. I'm just wondering if anyone has found a temporary workaround. Thanks in advance, - Scott

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• Why do i get a circular reference exception when calling to_json on an ActiveRecord::Relation

  - by midas06

  In Rails 3 (beta 3 on 1.8.7), when calling to_json on a relation i get a circular reference exception. Converting that relation to an array first, and THEN calling to_json works. Code That fails: Model.where().to_json (Where model is any model in your Rails 3 app) Code that works: Model.where().to_a.to_json This can be reproed on the console. Has anyone else run in to this? Is this expected?

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• WCF - Serialization Exception due to Circular reference

  - by Lijo

  Hi I am using DataContract with preserveObjectReferences set to false (default). Under any circumsatnces will it cause a Circular reference and cause Serialization Exception? if yes, could you please xplain with a sample scenario? Thanks Lijo

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• circular shift c

  - by simion

  I am doing some past papers and noticed a question where i have to shift the int one place to the right and return it i no in java i can just return n 1; is this possible in c? or is there a typically more compelx way of doing it :D. The method we were given is as follows // Return n after a right circular 1-bit shift unsigned int right_circular_shift_1(unsigned int n) {

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• setting image to circular slider object

  - by iSight

  Hi, How can i set an image to a circular slider, which is an object of NSSlider. I have called setImage: method, but does not work out. What could be the alternative approach to do so.

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• Circular shift operations in C++

  - by Elroy

  Left and right shift operators (<< and ) are already available in C++. However, I couldn't find out how I could perform circular shift or rotate operations. How can operations like "Rotate Left" and "Rotate Right" be performed? Rotating right twice here Initial --> 1000 0011 0100 0010 should result in: Final --> 1010 0000 1101 0000 An example would be helpful.

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• Python initialization and circular reference counts

  - by eric

  Can we initialize python objects with statement like this: a = b = c = None it seems to me when I did a = b = c = list() will cause circular reference count issue. Please give your expert advice.

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• Circular increment: Which is "better"?

  - by Helper Method

  When you have a circular buffer represented as an array, and you need the index to wraparound (i.e., when you reach the highest possible index and increment it), is it "better" to: return (i++ == buffer.length) ? 0: i; Or return i++ % buffer.length; Has using the modulo operator any drawbacks? Is it less readable than the first solution?

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• How to avoid circular reference when excel cell update

  - by Nimo

  Hi, I'm writing a set of functions in c++ which can be called by excel. However, these functions are asynchronous, therefore no immediate return values available. Once a result is available I used a callback function through VBA which update the result to the relevant cell which called the functions. But, here I'm having circular function calling problem, because when I update the cell. excel automatically call the original function once again. Please help me to get around this problem Thank You

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• Is it a bad practice to pass structs by reference?

  - by Fraga

  I usually save serialized structs to my database, so I pass them by reference a lot! Is that a bad practice?

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• WPF How to get window reference that is loaded from a page that is into it?

  - by toni

  Hi! I have a page that is into a window similiar to MDI. I want to get the reference of the window in what the page is placed into. The window is loaded. Thanks.

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• Why is it a bad practice to pass structs by reference?

  - by Fraga

  I usually save serialized structs to my database!. So I pass them by reference a lot!. Is that a bad practice?

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• Source cross reference like LXR but written in PHP?

  - by Dan

  Hi, does someone know a good cross reference engine like LXR, but written in PHP? My provider has PHP and MySQL as well as Postgres DBs, but neither I have access to Perl nor via SSH. I'd like to put up a online cross ref for my Software which is written in C. Thanks for helping! Dan

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• Where are value types defined in a reference type stored (heap or stack) ?

  - by Hemanshu Bhojak

  Are the value types defined inside a reference type stored on the heap or on the stack? If stored on the heap, then when are value types stored on the stack? If stored on the stack, then what goes inside the heap as everything ends at a value type in the end?

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• When you need pass by reference in Java to assign values to multiple parameters, how do you do it?

  - by mr popo

  In order to refactor some methods into smaller ones, I need pass by reference, since I can only have one return type. I could create a different return or parameter type whenever I need to do this, but then I'd end up with a bunch of bloated, seemingly unnecessary classes. What is the best alternative here, besides redesigning the program, which can't be done?

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• Is it possible to symbolically reference a Perl CORE module?

  - by Blaise Roth

  I know I could easily do something like sub sin { sin($_[0]); } and symbolically reference that for every function I need to symb ref, but I'd just like to know if there's a way to do something like {$foo}(123); vs. &{$foo}(123); which works, but not for core functions. Thanks.

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• How can I reference a file in my drawable folder to put in WebView in android?

  - by Thomas Johnson

  For example, I want to make an image appear in webview to utilize the zoom functions. I would use this line of code: this.myWebView.loadUrl("file://"); I just need to know what to put after file to reference the image.

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• Do the assemblies in Add Reference dialog differ depending on .Net framework used?

  - by Dmitri Nesteruk

  I'm curious - does the listing of assemblies in the Add Reference dialog vary depending on the version of the .Net framework used for the selected project. If they do differ, I'd love to know where the differences lie. Thanks!

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• What (are there any) languages with only pass-by-reference?

  - by Dervin Thunk

  Hello, I was wondering. Are there languages that use only pass-by-reference as its eval strategy? Thank you.

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• Does a PHP per-function (or per-task) performance / benchmark reference exist?

  - by Lorren Biffin

  I'm running my own (albeit, basic) benchmarks in a linux-based sandbox. However, I'd love to find a per-function or per-task performance / benchmark reference or utility for comparison. Does this exist? Of course I've done my own fair diligence / searching and have so far come up empty handed.. (I'm primarily interested in information relevant to PHP 5.3) Thanks very much! :)

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• Are reference attributes destroyed when class is destroyed in C++?

  - by Genba

  Suppose I have a C++ class with an attribute that is a reference: class ClassB { ClassA &ref; public: ClassB(ClassA &_ref); } Of course, the constructor is defined this way: ClassB::ClassB(ClassA &_ref) : ref(_ref) { /* ... */ } My question is: When an instance of class 'ClassB' is destroyed, is the object referenced by 'ClassB::ref' also destroyed?

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