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• How to track the memory usage in C++

  - by akintayo

  Hi I have a C++ program running under linux. Is it possible to track its memory usage from the code? I am allocating new objects and running out of memory, so I want to keep track of how quickly I am using memory. Thanks

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• What's the (memory) footprint of a J2EE servlet?

  - by Amr Mostafa

  For Jetty, Tomcat, or any other servlet container of your choice, what's the average footprint (memory, and any other notable resources) of a basic servlet? This includes any other basic objects that you almost always need per servlet, such as a view resolver. I'm not looking for a quantitative number in particular, but any indicative answer that could give an idea of how "heavy" or "lightweight" a servlet is. Thanks in advance

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• Why can't your switch statement data type be long Java?

  - by Fostah

  Here's an excerpt from Sun's Java tutorials: A switch works with the byte, short, char, and int primitive data types. It also works with enumerated types (discussed in Classes and Inheritance) and a few special classes that "wrap" certain primitive types: Character, Byte, Short, and Integer (discussed in Simple Data Objects ). There must be a good reason why the long primitive data type is not allowed. Anyone know what it is?

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• Should I use an ArrayList or IList

  - by Farstucker

  Im using the .NET framework 1.1 and Im hoping someone could help me implement a dynamic array of objects? A watered-down example of the object I wish use is below. Class CarObj { public string CarName; public string CarYear; } Should I use an ArrayList or do you think it would be better to make a CarList class to implement an IList interface? Is there a performance benefit for one over another?

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• Is it better to store an NSArray of NSManagedObjects or NSManagedObjectIDs?

  - by Kevin

  In my application I need to keep track of a list of objects that are being displayed. Right now I have an NSArray with all of the NSManagedObjects. Would I be better off to store the ObjectIDs and then only request the object when I need it? I am mainly concerned about memory at this point.

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• How can I check if an object has a specific method?

  - by Ghommey

  I want to use a method of an object. Like $myObject->helloWorld(). However there are a couple of methods so I loop through an array of method names and call the method like this: my $methodName ="helloWorld"; $myObject->$methodNames; This works quite nice but some objects don't have all methods. How can I tell whether $myObject has a method called helloWorld or not?

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• Update model instance with dynamic field names

  - by herpderp

  What I want to do is pretty simple: f=Foobar.objects.get(id=1) foo='somefield' bar='somevalue' f.foo=bar f.save() This doesn't work as it tries to update the f object's 'foo' field, which of course doesn't exist. How can I accomplish this?

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• Paste event for a DisplayObjectContainer not registered in AS3

  - by intoTHEwild

  I have a display object container and I am trying to add a paste event to it. But the event is not being registered. The documentation at liveDocs mentions that classes that derive from Interactive objects can dispatch paste event but I dont understand why it wouldnt work for me. My app is not an AIR app, could it be a reason ?

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• Heap as memory store same as data structure heap?

  - by Tony

  Is the heap one uses as a data structure (complete binary tree) in Computer Science the same type of heap used in memory where objects are allocated?

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• When log shows a lot of GC hits, what code change shall we need?

  - by Pentium10

  When log shows a lot of Garbage Collection hits, what code change shall we need? Do we need to free some objects? Will we speed up the code with object reusal?

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• When to use reflection to convert datarow to an object

  - by Daniel McNulty

  I'm in a situation now were I need to convert a datarow I've fetched from a query into a new instance of an object. I can do the obvious looping through columns and 'manually' assign these to properties of the object - or I can look into reflection such as this: http://www.codeproject.com/Articles/11914/Using-Reflection-to-convert-DataRows-to-objects-or What would I base the decision on? Just scalability??

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• iphone list of items (webservice)

  - by malleswar

  Hi, Can any body provide me sample code or sample applications to retrieve list of items and list of objects from web service and to parse it. Thanks in advance Regards, Malleswar

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• Good resource for explaining how hash codes are used in collections

  - by Michael

  Hi, Can anyone give a good explanation and / or links to a good resource of how hash codes are used in storing and retrieving objects in hashtables, dictionaries etc, specifically in C# / .NET. I'm interested to see how Equals and GetHashCode are used collectively when storing and retrieving items.

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• best scala idiom for find & return

  - by IttayD

  This is something I encounter frequently, but I don't know the elegant way of doing. I have a collection of Foo objects. Foo has a method bar() that may return null or a Bar object. I want to scan the collection, calling each object's bar() method and stop on the first one returning an actual reference and return that reference from the scan. Obviously: foos.find(_.bar != null).bar does the trick, but calls #bar twice.

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• What is the opposite of JAXB? i.e. generating XML FROM classes?

  - by 8EM

  I am currently designing a solution to a problem I have. I need to dynamically generate an XML file on the fly using Java objects, in the same way JAXB generates Java classes from XML files, however the opposite direction. Is there something out there already like this? Alternatively, a way in which one could 'save' a state of java classes. The goal I am working towards is a dynamically changing GUI, where a user can redesign their GUI in the same way you can with iGoogle.

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• A nuts and bolts reference to C# performance and memory use

  - by phil

  I wonder if anyone could point me in the direction where I can read about the nuts and bolts of C#. What I'm interested in learning are method call costs, what it costs to create objects and such. My aim of learning this is to get a better understanding of how increase the performance of an application and get a better understanding of how the C# language works. The reference should preferable be a book, a book that I can read cover to cover.

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• What's the term for an isolated set of references?

  - by Brabster

  I know I learnt this on the SCJP syllabus, but it escapes me. What's the term for a set of objects that refer to each other but are no longer accessible from your program (and are thus eligible for garbage collection)?

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• Django: Save an uploaded file to a FileField

  - by David Wolever

  I feel a little stupid for having to ask this… But I can't seem find it documented anywhere. If I've got a Model with FileField, how can I stuff an uploaded FILE into that FileField? For example, I'd like to do something like this: class MyModel(Model): file = FileField(...) def handle_post(request, ...): mymodel = MyModel.objects.get(...) if request.FILES.get("newfile"): mymodel.file = request.FILES["newfile"] But that doesn't appear to work.

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• Can we call methods of non-static classes without an object in Java?

  - by ask

  In Java, the wrapper class Integer has the static method parseInt() which is used like this: Integer.parseInt(). I thought only methods of static classes could be called like this (ie. Class.doMethod()). All non-static classes need objects to be instantiated to use their methods. I checked the API, and apparently Integer is declared as public final Integer - not static. Someone please help me understand this.

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• Which are the most noteable things which make working with Core Date so different than with MySQL?

  - by mystify

  One thing I have in mind is, that datasets in Core Data (or lets say: managed objects) have no ID like known from other databases such as MySQL. Also, they're not in a specific guaranteed order. What else makes Core Data much more "special" compared to working with a relational database like MySQL? Besides the whole object graph persisting and ORM stuff?

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• Can you change the style of an object based on a property within the object in WPF?

  - by Harry

  I have a class for message, and the objects are being displayed in a ListBox and there's a property for the message based on whether it's sent to or from the user. Is there a way to create two different styles and change them depending on this property?

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• How can I change the binding for template elements at runtime?

  - by Koynov

  I've found few solutions which assumes that I have 2 or 3 binding objects(or data templates) - that is not good solution for me. Is there an easy way to do this? I can think of cycling through the visual tree and set the binding that way but still this solution doesn't look very neat. Thank you in advance.

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• Can Django be used for non web apps?

  - by Leeks and Leaks

  I noticed in the main Django introductin they show a feature that maps python objects to the database. This doesn't strike me as being mutually exclusive with with development, is there any reason why this can't be used for non web apps? Is it easy to separate out?

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• What's a good free tool for investigating unintentional object retention in Java?

  - by Steve Emmerson

  My multithreaded Java program crashes because it runs out of heap space and I don't think it should. Assuming the culprit is unintentional object retention, what's a good free tool to investigate what objects are being unintentionally retained? My IDE is Eclipse.

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• FLEX: what's the best way to check if an Object has been already added to an ArrayCollection ?

  - by Patrick

  Hi, I need to merge 2 arrayCollection and avoid duplicates. They contain objects with their own attributes. I would like to avoid duplicates. thanks

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