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  • Objects with inheritance memory storage

    - by nikitas350
    Say that i have some classes like this example. class A { int k, m; public: A(int a, int b) { k = a; m = b; } }; class B { int k, m; public: B() { k = 2; m = 3; } }; class C : private A, private B { int k, m; public: C(int a, int b) : A(a, b) { k = b; m = a; } }; Now, in a class C object, are the variables stored in a specific way? I know what happens in a POD object, but this is not a POD object...

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  • AJAX Closures and targeting 'this'

    - by Nick Lowman
    In the code example below the success callback function logs 'input#04.update' four times rather than each individual input, which makes sense seeing how closures work but how would I go about targeting each individual input using this. <input type="text" name="" id="01" class="update"> <input type="text" name="" id="02" class="update"> <input type="text" name="" id="03" class="update"> <input type="text" name="" id="04" class="update"> function updateFields(){ $('input.update').each(function(){ $this = $(this); $.ajax({ data: 'id=' + this.id, success: function(resp){ console.log($this); $this.val(resp) } }); }); }

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  • How do I filter values in a Django form using ModelForm?

    - by malandro95
    I am trying to use the ModelForm to add my data. It is working well, except that the ForeignKey dropdown list is showing all values and I only want it to display the values that a pertinent for the logged in user. Here is my model for ExcludedDate, the record I want to add: class ExcludedDate(models.Model): date = models.DateTimeField() reason = models.CharField(max_length=50) user = models.ForeignKey(User) category = models.ForeignKey(Category) recurring = models.ForeignKey(RecurringExclusion) def __unicode__(self): return self.reason Here is the model for the category, which is the table containing the relationship that I'd like to limit by user: class Category(models.Model): name = models.CharField(max_length=50) user = models.ForeignKey(User, unique=False) def __unicode__(self): return self.name And finally, the form code: class ExcludedDateForm(ModelForm): class Meta: model = models.ExcludedDate exclude = ('user', 'recurring',) How do I get the form to display only the subset of categories where category.user equals the logged in user?

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  • Should I implement IDisposable here?

    - by dotnetdev
    My method which calls SQL Server returns a datareader but because of what I need to do (return the datareader to the calling method which is in page code-behind), I can't close the connection in the class of the method which calls sql server, so I have no finally or using blocks. Is the correct way of disposing resources to make the class implement IDisposable? Or from the caller, explicitly dispose the unmanged resource (class-level fields)? Thanks

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  • Does Java have "properties" that work the same way properties work in C# (see the body of my text)?

    - by tyrone302
    In C#, you can use properties to make a data field publicly accessible (allowing the user to directly access it), and yet retain the ability to perform data validation on those directly-accessed fields. Doese Java have something similar? For Instance, suppose there exists a C# class with the following implementation(see below): public class newInt{ public newInt(){...} public int x{ get{ return this.x } set{ this.x = isValid(value) } } } private static int isValid(int value){...} This definition in the class allows the user to "naturally" use the data field 'x' when retrieving values from it and assigning values to it. Below is how it would be used in main. public class Test{ public static void main(String[] args){ newInt a = new newInt(); a.x = 50; int b = a.x; } } The question is... can java do this as well? if so, what is it called?

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  • Problems With SWT on Mac

    - by Jav
    I've got a java project that uses an SWT UI and I'm having trouble deploying it on any Mac OS X computers. The program itself works perfectly on Windows when it is either run from within Eclipse or from a jar file. On Mac, the program also works fine in Eclipse, but when I try to run it from a jar file, I get the following error: 2010-04-30 13:33:04.564 java[17825:41b] *** _NSAutoreleaseNoPool(): Object 0x10b9b0 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0x944acf4f 0x943b9432 0x678fb79 0x35a19b1 0x359ba7f) 2010-04-30 13:33:04.566 java[17825:41b] *** _NSAutoreleaseNoPool(): Object 0x115ef0 of class NSCFNumber autoreleased with no pool in place - just leaking Stack: (0x944acf4f 0x943b9432 0x678a0b0 0x35a19b1 0x359ba7f) 2010-04-30 13:33:04.567 java[17825:41b] *** _NSAutoreleaseNoPool(): Object 0x121000 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0x944acf4f 0x943b9432 0x678fb79 0x35a19b1) 2010-04-30 13:33:04.581 java[17825:41b] *** _NSAutoreleaseNoPool(): Object 0x123720 of class NSPathStore2 autoreleased with no pool in place - just leaking Stack: (0x944acf4f 0x943ba637 0x943c238f 0x943c1e8e 0x943c694b 0x678992e 0x35a19b1) 2010-04-30 13:33:04.582 java[17825:41b] *** _NSAutoreleaseNoPool(): Object 0x12d660 of class NSPathStore2 autoreleased with no pool in place - just leaking Stack: (0x944acf4f 0x943ba637 0x943b9739 0x943c3eb2 0x943c6b22 0x678992e 0x35a19b1) ... ... ... The actual error is much larger, and continues until the program crashes. I know that I am using the correct swt.jar file and I have tried running the program with the -XstartOnFirstThread VM argument, but still have not had any luck. Does anybody have any ideas or any suggestions where I could start looking for a solution? Thanks.

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  • Deleting dynamic array of char in C++.

    - by anonymous
    I have this class, with the atribute 'word' class Node { char *word; Inside the Node constructor, I do this asignation: word = new char[strlen(someword)]; In the destructor of the Node class, I try to delete the contents pointed by word: delete []word; I obtain the next message after executing the programs: "Heap block at 003E4F48 modified at 003E4F51 past requested size of 1" What am I not doing well?

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  • php: avoiding __get in certain circumstances?

    - by user151841
    I have a class where I'm using __set. Because I don't want it to set just anything, I have an array of approved variables that it checks before it will actually set a class property. However, on construct, I want the __construct method to set several class properties, some of which are not in the approved list. So when construct happens, and I do $this->var = $value, I of course get my exception that I'm not allowed to set that variable. Can I get around this somehow?

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  • OverRiding Help

    - by user445714
    Few questions on over riding. I am interiting a method openRead from another class, the method is to be overridden so that the scanner class uses the provided delimiter pattern, which is referenced. I need to make use of the scanner class useDelmiter method method from another class [code] public boolean openRead() throws FileNotFoundException { sc = new Scanner(new File(fileName)); if (fileName != null) { return true; } else { return false; } } [/code] delimiter [code] protected final String DELIMITERS = "[\s[^'a-zA-Z]]"; [/code] I'm at a loss to how i over ride this using the constant delimiter.

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  • Why does Java think my object is a variable?

    - by user2896898
    Ok so I'm trying to make a simple pong game. I have a paddle that follows the mouse and a ball that bounces around. I wrote a method collidesWith(Sprite s) inside of my Sprite class that checks if the ball collides with the paddle (this works and isn't the problem). I have two objects extending my sprite class, a ball and a paddle object. So inside of my ball class I'm trying to check if it collides with the paddle. So I've tried if(this.collidesWith(paddle) == true){ System.out.println("They touched"); } I've also tried ball.collidesWith(paddle) and other combinations but it always says the same thing about the paddle (and the ball when I use ball.collidesWith) "Cannot find symbol. Symbol: variable paddle(or ball). Location: class Ball" So if I'm reading this right, it thinks that the paddle (and ball) are variables and it's complaining because it can't find them. How can I make it understand I am passing in objects, not variables? For extra information, an earlier assignment had me make two boxes and for them to change colors when they were colliding. In that assignment I used very similar code to above with if(boxOne.collidesWith(boxTwo) == true){ System.out.println("yes"); } And in this code it worked just fine. The program knew that boxOne and boxTwo were child classes of my Sprite class. Anyone know why they wouldn't work the same?

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  • Is there any difference these two pieces of code?

    - by Poiuyt
    #include<stdio.h> class A {public: int a; }; class B: public A {private: int a;}; int main(){ B b; printf("%d", b.a); return 0; } #include<stdio.h> class A {public: int a; }; class B: private A {}; int main(){ B b; printf("%d", b.a); return 0; } I ask because I get different errors: error: 'int B::a' is private error: 'int A::a' is inaccessible Apart from what the errors might reveal, is there any difference at all in the behaviour of these two pieces of code?

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  • simple javascript form code

    - by Steven Chaney
    I have a simple question about running some JS in a form i am trying to make it so that if a user selects an option (entry_12) in a drop down list, that the next form fields are not required (entry_11 entry_13 entry_11) those are the IDs for the fields any thoughts? im not sure where to start on this i have searched all over google and cannot find an instance of this. im trying to make it so if a user selects 'check' out of this list <div class="ss-item ss-item-required ss-select"><div class="ss-form-entry"><label class="ss-q-title" for="entry_12">Card Type <span class="ss-required-asterisk">*</span></label> <label class="ss-q-help" for="entry_12"></label> <select name="entry.12.single" id="entry_12"><option value="Check">Check</option> <option value="Mastercard">Mastercard</option> <option value="Visa">Visa</option> <option value="Amex">Amex</option> <option value="Discover">Discover</option></select></div></div></div> that the next fields (cvc code, exp date, cc number) arent required as they are if they had chosen CC

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  • Force the use of interface instead of concrete implementation in declaration (.NET)

    - by gammelgul
    In C++, you can do the following: class base_class { public: virtual void do_something() = 0; }; class derived_class : public base_class { private: virtual void do_something() { std::cout << "do_something() called"; } }; The derived_class overrides the method do_something() and makes it private. The effect is, that the only way to call this method is like this: base_class *object = new derived_class(); object->do_something(); If you declare the object as of type derived_class, you can't call the method because it's private: derived_class *object = new derived_class(); object->do_something(); // --> error C2248: '::derived_class::do_something' : cannot access private member declared in class '::derived_class' I think this is quite nice, because if you create an abstract class that is used as an interface, you can make sure that nobody accidentally declares a field as the concrete type, but always uses the interface class. Since in C# / .NET in general, you aren't allowed to narrow the access from public to private when overriding a method, is there a way to achieve a similar effect here?

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  • Fading between two classes in jquery

    - by Andy
    I would like to be able to fadeout this class <h2 class="care-home-fees"><a title="Care Home Fees" href="#">Text</a></h2> and fade in this <h2 class="care-home-fees-over"><a title="Care Home Fees" href="#">Text</a></h2> Notice there are two separate images Here is my current markup which doesnt seem to work $(document).ready(function(){ $("h2.care-home-fees").hover( function () { $(this).addClass("care-home-fees-over"); }, function () { $(this).removeClass("care-home-fees"); } ); }); and the button printed before any change <h2 class="care-home-fees"><a title="Care Home Fees" href="#">Text</a></h2>

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  • Jquery (this) selector help

    - by mtwallet
    Hi. I have the following HTML: <div class="box"><img src="pic.jpg" alt="image" /></div> <div class="box"><img src="pic.jpg" alt="image" /></div> <div class="box"><img src="pic.jpg" alt="image" /></div> <div class="box"><img src="pic.jpg" alt="image" /></div> I am trying to select the div and the child image both at the same time. I need to use $(this) to select the div. I know I can use $(this).children() or $(this).find('img') to get the image. Is there a way to select both the div and image using $(this) for the div.

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  • collapse row by row with (jQuery)

    - by Mini
    I want to hide/show a lot of contents by id Here is an example: <a href="#" class="click"> title here </a> <p class="content" id="1"> text here ... </p> <a href="#" class="click" id="2"> another title here </a> <p class="content"> another text here ... </p> I can add an ID into my HTML code. How Can I get it by jQuery? The jQuery lines: <script type="text/javascript"> $(document).ready(function(){ $('.content').hide(); $('.click').click(function() { $('.content').slideToggle(500); return false; });

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  • Pin Control in HCS12

    - by Brian Lindsey
    A HCS12 microcontroller I had to buy for a class I had recently taken has 40 pins on the back side of it. The class was merely about computer organization, and so unfortunately, we never had a chance to cover all the capabilities of the chip itself. Now that the class is over, I have been thinking about using the to familiarize myself with the assembly language. I haven't found any sources that cover pin control and was wondering if anyone could possibly provide me with a hands-on pin tutorial.

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  • Cannot create an array of LinkedLists in Java...?

    - by kchau
    I'm working on a sparse matrix class that needs to use an array of LinkedLists to store the values of a matrix. Each element of the array (i.e. each LinkedList) represents a row of the matrix. And, each element in the LinkedLists represents a column and the stored value. In my class, I have a declaration of the array as: private LinkedList<IntegerNode>[] myMatrix; And, in my constructor for the SparseMatrix, I try to define: myMatrix = new LinkedList<IntegerNode>[numRows]; The error I end up getting is "Cannot create a generic array of LinkedList<IntegerNode>." So, I have two issues with this, 1) What am I doing wrong, and 2) Why is the type acceptable in the declaration for the array if it can't be created? Edit: IntegerNode is a class that I have created. And, all of my class files are packaged together.

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  • how do i use @var on a function variable?

    - by fayer
    i've got a variable $user that is of data type User (a class). i've got it in a class method so i can't just type: /** * @var User */ $user = Factory::getInstance('User'); because that will work only with class properties, not method variables like in this case. how could i tell netbeans that that variable is of data type User in a method? Thanks!

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  • Visual DataFlex: call WebService from the web page

    - by globus
    I have the web service and generated class for it. I can use this generated class in windows application as it described in Help. The question is: how can I use this generated class in the web project? (the analogous actions - creating object and use its functions -, as it was in windows app, are not worked)

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  • jquery help assigning multiple mouse events using a .each() to hide/show icons and show background c

    - by Ronedog
    Need some help assigning a mouseover event to display some icons that start out hidden. For every <li> in the ul, I have icons. When the user mouses over the <li> I want the span tag with a class called "icons" to be displayed. When the mouse out event occurs remove the class and/or just hide the span. The problem for me is how to assign event so just the span tag and its contents appear and disapear when the mouse hovers over the <li>. Heres the HTML: <ul id="nav"> <li>Cat 1 <span class="icons"> <div>stuff here</div> </span> </li> <li>Cat 2 <span class="icons"> <div>stuff here</div> </span> <ul> <li>Sub Cat 2A <span class="icons"> <div>2A stuff here</div> </span> </li> </ul> </li> </ul> Heres my jquery code. $('#nav li').each(function(){ //Add Background Shading o Mouseover to all Rows in the menu $(this).mouseover(function(){ $(this).addClass("background_grey").removeClass("icons"); }) $(this).mouseout(function(){ $(this).removeClass("background_grey").addClass("icons"); }); }); Thanks for the help.

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  • Removing an associated object with a link_to to the update action

    - by Numbers
    class Question < ActiveRecord::Base belongs_to :category end class Category < ActiveRecord::Base has_many :questions accepts_nested_attributes_for :questions, allow_destroy: true end CategoriesController: private def category_params params.require(:category).permit(:title, questions_attributes: [:id, :category_id, :title, :_destroy]) end In the view I have a category displaying all it's posts (CategoriesController#show). Each post is deletable. How could I construct a link_to helper that deletes a post by updating the category?

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