initialization

iPhone NSTimer OpenGL problem

I've got a problem that only seems to occur on the device, not in the simulator. My app's animation is started and stopped using these methods: NSTimer* animationTimer; -(void)startAnimation { if(animationTimer == nil) animationTimer = [NSTimer scheduledTimerWithTimeInterval:1.0f/60.0f target:self selector:@selector(drawVi...

Array Concatenation in C#

1- How to smartly initialize an Array with 2 (or more) other arrays in C#? double[] d1=new double[5]; double[] d2=new double[3]; double[] dTotal=new double[8];// I need this to be {d1 then d2} 2- Another question: How to concatenate C# arrays efficiently? Thanks ...

Spring @Autowired and WebApplicationContext in Tomcat

@Autowired works only once. What to do to make it wire the bean every time the Servlet is recreated? My web-app (Tomcat6 container) consists of 2 Servlets. Every servlet has private fields. Their setters are marked with @Autowired In the init method I use WebApplicationContextUtils ... autowireBean(this); It autowires the prope...

C# Strange Behavior

I have a custom struct : struct A { public int y; } a custom class with empty constuctor: class B { public A a; public B() { } } and here is the main: static void Main(string[] args) { B b = new B(); b.a.y = 5;//No runtime errors! Console.WriteLine(b.a.y); } When I run the above program, it does ...

How to make an AJAX call immediately on document loading

I want to execute an ajax call as soon as a document is loaded. What I am doing is loading a string that contains data that I will use for an autocomplete feature. This is what I have done, but it is not calling the servlet. I have removed the calls to the various JS scripts to make it clearer. I have done several similar AJAX calls in...

How to initialise a struct-type in the initialisation list?

How can I initilise a structure in the constructor list? Say: struct St{int x, y}; class Foo { public: Foo(int a = 0, int b = 0) : /*here initilise st_foo out of a and b*/ {} private: const St st_foo; }; ...

Is it bad practise to initialise fields outside of an explicit constructor

Possible Duplicate: Best Practice: Initialize class fields in constructor or at declaration? So its monday and we are arguing about coding practises. The examples here are a litttle too simple, but the real deal has several constructors. In order to initialise the simple values (eg dates to their min value) I have moved the co...

When I create a new String in Java, is it initialized with null or with " "?

Here's my test code: String foo = new String(); System.out.println(foo); The output is blank and a new line is written. Since I'm new to Java, I don't know whether it made a " " string, or nulls are handled as blank lines. ...

Java Singleton Pattern

Edit: Answered - error was method wasn't static I'm used the Singleton Design Pattern public class Singleton { private static final Singleton INSTANCE = new Singleton(); // Private constructor prevents instantiation from other classes private Singleton() {} public static Singleton getInstance() { return INSTANCE; ...

Is this pointer initialization necessary?

Lets say I have the following: CHARLINK * _init_link(CHARLINK **link) { short i; (*link)->cl = (CHARLINK **) calloc(NUM_CHARS, sizeof(CHARLINK *)); for (i = 0; i < NUM_CHARS; i++) (*link)->cl[i] = NULL; return (*link); } Is the loop to initialize each element to NULL necessary or are they automatically NULL ...

Is possible to initialize an object in javascript in this way?

I'd like to initialize an object in javascript calling directly a method that belongs to it: var obj = (function(){ return{ init: function(){ console.log("initialized!"); return this; }, uninit: function(x){ console.log("uninitialized!"); } }...

How/When/Where to Extend Gem Classes (via class_eval and Modules) in Rails 3?

What is the recommended way to extend class behavior, via class_eval and modules (not by inheritance) if I want to extend a class buried in a Gem from a Rails 3 app? An example is this: I want to add the ability to create permalinks for tags and categories (through the ActsAsTaggableOn and ActsAsCategory gems). They have defined Tag a...

SD card initialization using SPI interface

I get invalid response Codes from my SD Card(CMD8, CMD55, CMD41) Init routine: SDCS = 1; // MMC deaktiviert SPI1CON1bits.SMP = 0; SPI1CON1bits.CKE = 1; SPI1CON1bits.MSTEN = 1; SPI1CON1bits.CKP = 0; SPI1STATbits.SPIEN = 1; for(i=0;i<10;i++) SPI(0xFF); // RESET unsigned char rr=Command(CMD0,0); SDCS=1; // MMC de...

In Java, can a final field be initialized from a constructor helper?

I have a final non-static member: private final HashMap<String,String> myMap; I would like to initialize it using a method called by the constructor. Since myMap is final, my "helper" method is unable to initialize it directly. Of course I have options: I could implement the myMap initialization code directly in the constructor. MyC...

How does init() get called on a Handler in a WebApp

Hey, I have a Handler object that functions kind of like a service. It has a public init method defined in the Implementation but not the Interface. This Handler is also being autowired via Spring. How does the init method get invoked? Is it via Spring or does Tomcat call this? ...

initWithCoder breaking my touch events (touchBegan, touchMoved, etc)

So I have a UIView that has been setup, and in each touch event handler I have an NSLog fire off a message to the console. - (void) touchesBegan:(NSSSet*)touches withEvent:(UIEvent*)event { NSLog(@"touchesBegan"); } And that pretty much works as expected. But once I implement initWithCoder (even blank) - (id)initWithCoder:(NSCode...

declaring/initializing primitives equal to creating new objects

is declaring/initializing primitives the same as creating new objects? from what i know when we create primitives, we also creating wrapper classes for them. im implementing on java btw. ...

C# Initialize Subclass based on Parent object

So basically I have this public class Ticket{ public TicketNumber {get; set;} ..a bunch more properties... } I want to add some properties using a subclass like this using subsumption instead of composition. public class TicketViewModel(Ticket ticket){ //set each property from value of Ticket passed in this.TicketNumb...

initializing a vector of custom class in c++

Hey basically Im trying to store a "solution" and create a vector of these. The problem I'm having is with initialization. Heres my class for reference class Solution { private: // boost::thread m_Thread; int itt_found; int dim; pfn_fitness f; double value; std::vector<double> x; public: ...

why we can't initialize a servlet using constructor itself?

Why do we have to override init() method in Servlets while we can do the initialization in the constructor and have web container call the constructor passing ServletConfig reference to servlet while calling constructor? Ofcourse container has to use reflection for this but container has to use reflection anyway to call a simple no-arg ...