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• javascript undefined compare

  - by nahum

  Ok here is my question in javascript you can declare a variable and be undefined you can apply variable == undefined, I know that but how you can compare a value that you dont know yet if it's in the cpu memory. I have a class which is create it when the user click on a button. before this the class is undefined there no exist in any where so how can I compare it? without using try{}catch(e){} is there a way????

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• when does static member gets memory.

  - by vaibhav

  I have a class which have a static member. As I understand all static members are common for all instance of the class. So it means static members would get memory only once. Where is this memory is allocated (Stack or Heap) and when this memory get allocated.

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• 2 Questions about nUnit.

  - by Night Walker

  Hi all I have 2 questions about functionality of nunit. What is the difference between [TestFixtureSetUp] and [SetUp] attributes ? I am writing a some class with tests and I see that half of my test functions need one setup, And an another half needs another set up. How can I have in one class two little different SetUp functions that are called with different functions Thanks.

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• Call a method of subclass in Java

  - by eyecreate

  If I have a base class Base thing = null; of which there is a subclass class Subclass extends Base and I instigate it as thing = new Subclass how would I call a method that is specifically in Subclass, but not in Base? ex. Base has only method() Subclass has method() and specialMethod() the method specialMethod() is the one I want to call.

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• why Cannot invoke super constructor from enum constructor ?

  - by hilal

  public enum A { A(1); private A(int i){ } private A(){ super(); // compile - error // Cannot invoke super constructor from enum constructor A() } } and here is the hierarchy of enum A extends from abstract java.lang.Enum extends java.lang.Object Class c = Class.forName("/*path*/.A"); System.out.println(c.getSuperclass().getName()); System.out.println(Modifier.toString(c.getSuperclass().getModifiers()).contains("abstract")); System.out.println(c.getSuperclass().getSuperclass().getName());

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• Simple linq question: using linq to get an array of properties

  - by Joel Barsotti

  Lets say we have a simple class public class Foo { public string FooName; } Now we want to do some simple work on it. public void SomeCallerMethod(List<Foo> listOfFoos) { string[] fooNames = listOfFoo. // What to do here? } If I even knew what method to call, I could probably find the rest of the peices.

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• How change Castor mapping to remove "xmlns:xsi" and "xsi:type" attributes from element in XML output

  - by Derek Mahar

  How do I change the Castor mapping <?xml version="1.0"?> <!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN" "http://castor.org/mapping.dtd"> <mapping> <class name="java.util.ArrayList" auto-complete="true"> <map-to xml="ArrayList" /> </class> <class name="com.db.spgit.abstrack.ws.response.UserResponse"> <map-to xml="UserResponse" /> <field name="id" type="java.lang.String"> <bind-xml name="id" node="element" /> </field> <field name="deleted" type="boolean"> <bind-xml name="deleted" node="element" /> </field> <field name="name" type="java.lang.String"> <bind-xml name="name" node="element" /> </field> <field name="typeId" type="java.lang.Integer"> <bind-xml name="typeId" node="element" /> </field> <field name="regionId" type="java.lang.Integer"> <bind-xml name="regionId" node="element" /> </field> <field name="regionName" type="java.lang.String"> <bind-xml name="regionName" node="element" /> </field> </class> </mapping> to suppress the xmlns:xsi and xsi:type attributes in the element of the XML output? For example, instead of the output XML <?xml version="1.0" encoding="UTF-8"?> <ArrayList> <UserResponse xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="UserResponse"> <name>Tester</name> <typeId>1</typeId> <regionId>2</regionId> <regionName>US</regionName> </UserResponse> </ArrayList> I'd prefer <?xml version="1.0" encoding="UTF-8"?> <ArrayList> <UserResponse> <name>Tester</name> <typeId>1</typeId> <regionId>2</regionId> <regionName>US</regionName> </UserResponse> </ArrayList> such that the element name implies the xsi:type.

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• Preferred way of defining properties in Python: property decorator or lambda?

  - by parxier

  Which is the preferred way of defining class properties in Python and why? Is it Ok to use both in one class? @property def total(self): return self.field_1 + self.field_2 or total = property(lambda self: self.field_1 + self.field_2)

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• A view model mvvm design issue

  - by Chen Kinnrot

  the best way to explain is with example so: this is the model public class Person { public int age; public string name; } this is the view model public class PersonVM { } my question is: should the vm expose the person to the datga template or encapsulate the model properties with his own properties?

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• Why is there no way to do introspection in Objective C with Objects?

  - by user346741

  I have seen examples (on here especially) of calling hideous C functions and getting structures back that have to be iterated, replete with reams of underbars. Why can't I do this (pseudo to follow): Money *cost = [[Money alloc] init]; for (Property *property in [[cost class] properties]){ .. } for (Method *method in [[cost class] methods]){ .. } ?

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• What's the difference between casting using (Object as TClass) and TClass(Object)

  - by Peter Turner

  Got an issue where MyObj.classnameis(TMyClass.classname) is true and TMyClass(MyObj) works but (MyObj as TMyclass).doSomething throws a conversion error. I don't really want any help with that junk, although if you want to put it in the comments that'd be super. I just would like to know what the difference between Obj As Class and Class(Obj) is.

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• MVC.net 2 - change the HTML outputed by ValidationMessageFor - can this be down via templates?

  - by Nathan Kelly

  MVC.net 2 by default outputs validation messages like this: <span id="UserName_validationMessage" class="field-validation-valid">A Validation message</span> I would like it to do it like this: <label id="UserName_validationMessage" class="field-validation-valid">A Validation message</label> Is there a way to do it like the display and editor templates? Or is there another way to do it globally?

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• Java language convention; getters/setters

  - by Skogen

  Public class Example { private int number; public Example(int number){ this.number = number; } public int getNumber(){ return number; } public void setNumber(int number){ this.number = number; } public static void main(String[] args){ Example e = new Example(5); What is preffered when accessing a variable within its own class; "e.number" or "e.getNumber()" ?

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• Multi-threaded Pooled Allocators

  - by Darren Engwirda

  I'm having some issues using pooled memory allocators for std::list objects in a multi-threaded application. The part of the code I'm concerned with runs each thread function in isolation (i.e. there is no communication or synchronization between threads) and therefore I'd like to setup separate memory pools for each thread, where each pool is not thread-safe (and hence fast). I've tried using a shared thread-safe singleton memory pool and found the performance to be poor, as expected. This is a heavily simplified version of the type of thing I'm trying to do. A lot has been included in a pseudo-code kind of way, sorry if it's confusing. /* The thread functor - one instance of MAKE_QUADTREE created for each thread */ class make_quadtree { private: /* A non-thread-safe memory pool for int linked list items, let's say that it's * something along the lines of BOOST::OBJECT_POOL */ pooled_allocator<int> item_pool; /* The problem! - a local class that would be constructed within each std::list as the * allocator but really just delegates to ITEM_POOL */ class local_alloc { public : //!! I understand that I can't access ITEM_POOL from within a nested class like //!! this, that's really my question - can I get something along these lines to //!! work?? pointer allocate (size_t n) { return ( item_pool.allocate(n) ); } }; public : make_quadtree (): item_pool() // only construct 1 instance of ITEM_POOL per // MAKE_QUADTREE object { /* The kind of data structures - vectors of linked lists * The idea is that all of the linked lists should share a local pooled allocator */ std::vector<std::list<int, local_alloc>> lists; /* The actual operations - too complicated to show, but in general: * * - The vector LISTS is grown as a quadtree is built, it's size is the number of * quadtree "boxes" * * - Each element of LISTS (each linked list) represents the ID's of items * contained within each quadtree box (say they're xy points), as the quadtree * is grown a lot of ID pop/push-ing between lists occurs, hence the memory pool * is important for performance */ } }; So really my problem is that I'd like to have one memory pool instance per thread functor instance, but within each thread functor share the pool between multiple std::list objects.

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• Unexpected tag T_ECHO in inline if

  - by Lombo

  I have something like this in one of my views <li <?php $isCurrent ? echo 'class="current"' : ''?> > <a href="SOME_LINK" class="SOME_CLASS">SOME_TEXT</a> </li> This causes a syntax error, unexpected T_ECHO. Changing echo for print solves the issue, but I would like to understand why I cannot use echo.

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• Map entries become vectors when piped thru a macro

  - by Gavin Grover

  In Clojure, a map entry created within a macro is preserved... (class (eval `(new clojure.lang.MapEntry :a 7))) ;=> clojure.lang.MapEntry ...but when piped thru from the outside context collapses to a vector... (class (eval `~(new clojure.lang.MapEntry :a 7))) ;=> clojure.lang.PersistentVector This behavior is defined inside LispReader.syntaxQuote(Object form) condition if(form instanceof IPersistentCollection). Does anyone know if this is intended behavior or something that will be fixed?

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• How to fix the position of the button in applet

  - by user1609804

  I'm trying to make an applet that has a buttons in the right, where each button is corresponding to a certain pokemon. I already did it, but the buttons isn't fixed.they keep following the mouse. please help. This is my code: import javax.swing.*; import java.awt.image.BufferedImage; import java.io.*; import javax.imageio.ImageIO; import java.applet.*; import java.awt.event.*; import java.awt.*; public class choosePokemon extends Applet implements ActionListener { private int countPokemon; private int[] storePokemon; private int x,y; //this will be the x and y coordinate of the button BufferedImage Picture; public int getCountPokemon(){ //for other class that needs how many pokemon return countPokemon; } public int[] getStoredPokemon(){ //for other class that needs the pokemon return storePokemon; } public void init(){ x=0;y=0; try{ Picture = ImageIO.read(new File("pokeball.png")); } catch( IOException ex ){ } } public void paint( Graphics g ){ pokemon display = new pokemon(); // to access the pokemon attributes in class pokemon ButtonGroup group = new ButtonGroup(); //create a button group for( int a=0;a<16;a++ ){ // for loop in displaying the buttons of every pokemon(one pokemon, one button) display.choose( a ); //calls the method choose in which accepts an integer from 0-15 and saves the attributes of the pokemon corresponding to the integer JButton pokemonButton = new JButton( display.getName() ); // creates the button pokemonButton.setActionCommand( display.getName() ); // isasave sa actioncommand yung name ng kung ano mang pokemon pokemonButton.addActionListener(this); //isasama yung bagong gawang button sa listener para malaman kung na-click yung button pokemonButton.setBounds( x,y,50,23 ); group.add( pokemonButton ); //eto naman yung mag-aadd sa bagong gawang button sa isang group na puro buttons(button ng mga pokemon) y+=23; if( a==7 ){ x+=50; y=0; } add( pokemonButton ); //will add the button to the applet } g.drawImage( Picture, 120, 20, null ); } public void actionPerformed(ActionEvent e) { try{ //displays the picture of the selected pokemon Picture = ImageIO.read(new File( "pokemon/" + e.getActionCommand() + ".png" )); } catch( IOException ex ){ } } public boolean chosen( int PChoice ){ //this will check if the chosen pokemon is already the player's pokemon boolean flag = false; for( int x=0; x<countPokemon && !flag ;x++ ){ if( storePokemon[x]==PChoice ){ flag = true; } } return flag; }

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• Unit testing installation of services

  - by skiphoppy

  Our installer program is going to be installing a number of system services, under both Windows and UNIX, using JavaServiceWrapper. There will be a class responsible for creating JavaServiceWrapper config files, installing the services, etc. Can I have some suggestions on how to unit-test this class?

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• In Python, can an object have another object as an attribute?

  - by ChrisC

  In Python, can an object have another object as an attribute? For example, can a class called car have a class called tire as an attribute?

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• PHP: Extending static member arrays

  - by tstenner

  I'm having the following scenario: class A { public static $arr=array(1,2); } class B extends A { public static $arr=array(3,4); } Is there any way to combine these 2 arrays so B::$arr is 1,2,3,4? I don't need to alter these arrays, but I can't declare them als const, as PHP doesn't allow const arrays.http://stackoverflow.com/questions/ask The PHP manual states, that I can only assign strings and constants, so parent::$arr + array(1,2) won't work, but I think it should be possible to do this.

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• What is the default behavior of Equals Method?

  - by Mostafa Mahdieh

  Let A be a class with some members as x, y, z: Class A { int x; int y; String z; ... } A is an Object so it inherits the "Equals" functions defined in Object. What is the default behavior of this function? Does it check for the equality of members or does it check for reference equality?

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• In Google Glass, Menu Items are not shown after XE 17.2 Update, any Solutions?

  - by Amalan Dhananjayan

  This worked when the Glass in on XE12, I have opened the solution after about 2 Months and now with XE17 the menu items are not shown when tapped on the Live card, instead the live card is disappearing. I have updated the GDK, I have changed the code to support the latest GDK sneak peek version 2 changes according to this (https://developers.google.com/glass/release-notes#xe12) This is the code public class MenuActivity extends Activity { private static final String TAG = MenuActivity.class.getSimpleName(); private VisionService.VisionBinder mVisionService; private ServiceConnection mConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { if (service instanceof VisionService.VisionBinder) { mVisionService = (VisionService.VisionBinder) service; openOptionsMenu(); } // No need to keep the service bound. unbindService(this); } @Override public void onServiceDisconnected(ComponentName name) { } }; private boolean mResumed; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); bindService(new Intent(this, VisionService.class), mConnection, 0); } @Override protected void onResume() { super.onResume(); mResumed = true; openOptionsMenu(); } @Override protected void onPause() { super.onPause(); mResumed = false; } @Override public void openOptionsMenu() { if (mResumed && mConnection != null) { super.openOptionsMenu(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_send) { mVisionService.requestWorkOrderCard(); finish(); return true; } else if (id == R.id.action_refresh) { mVisionService.requestTopWorkOrders(); finish(); return true; } else if (id == R.id.action_finish) { stopService(new Intent(this, VisionService.class)); finish(); return true; } else { return super.onOptionsItemSelected(item); } } @Override public void onOptionsMenuClosed(Menu menu) { super.onOptionsMenuClosed(menu); } } It would be great if any body could help on this. Thank You

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• Restrictions in trait mixing

  - by Jeriho

  I want to have classes that can mix only specified traits: class Peter extends Human with Lawful with Evil class Mag extends Elf with Chaotic with Neutral Is in scala a way to do this?

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• How can I convert a C# application that uses StandardInput and StandardOutput in .NET Compact Framew

  - by Chad

  I have an application that uses the Process class, StandardInput, and StandardOutput to communicate with an external executable. I am using this to pass strings back and forth, and it works well in my Windows application. On the mobile device, I do not see StandardInput or StandardOutput in the Process class. Is there an easy way to replicate this functionality on the Mobile?

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• How do I do distributed UML development (à la FOSS)?

  - by James A. Rosen

  I have a UML project (built in IBM's Rational System Architect/Modeler, so stored in their XML format) that has grown quite large. Additionally, it now contains several pieces that other groups would like to re-use. I come from a software development (especially FOSS) background, and am trying to understand how to use that as an analogy here. The problem I am grappling with is similar to the Fragile Base Class problem. Let me start with how it works in an object-oriented (say, Java or Ruby) FOSS ecosystem: Group 1 publishes some "core" package, say "net/smtp version 1.0" Group 2 includes Group 1's net/smtp 1.0 package in the vendor library of their software project At some point, Group 1 creates a new 2.0 branch of net/smtp that breaks backwards compatibility (say, it removes an old class or method, or moves a class from one package to another). They tell users of the 1.0 version that it will be deprecated in one year. Group 2, when they have the time, updates to net/smtp 2.0. When they drop in the new package, their compiler (or test suite, for Ruby) tells them about the incompatibility. They do have to make some manual changes, but all of the changes are in the code, in plain text, a medium with which they are quite familiar. Plus, they can often use their IDE's (or text editor's) "global-search-and-replace" function once they figure out what the fixes are. When we try to apply this model to UML in RSA, we run into some problems. RSA supports some fairly powerful refactorings, but they seem to only work if you have write access to all of the pieces. If I rename a class in one package, RSA can rename the references, but only at the same time. It's very difficult to look at the underlying source (the XML) and figure out what's broken. To fix such a problem in the RSA editor itself means tons of clicking on things -- there is no good equivalent of "global-search-and-replace," at least not after an incomplete refactor. They real sticking point seems to be that RSA assumes that you want to do all your editing using their GUI, but that makes certain operations prohibitively difficult. Does anyone have examples of open-source UML projects that have overcome this problem? What strategies do they use for communicating changes?

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