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• PHP class referencing confusion across multiple files

  - by DssTrainer

  I have an index.php file that has 3 includes <?php require_once('mod.php'); $mod = new Mod(); require_once('start.php'); require_once('tools.php'); ....some code.... ?> I need to be able to reference the $mod object inside the start.php and tools.php. How do I pass that object to be referenced by those 2 other require files? Basically the mod.php is a class that has an array list generated in its __construct(). I want to use that array list data inside the startup.php and tools.php file but not sure how to pass in the existing one without calling "new" inside both of those files separately which doesn't do what I need since it resets everything. Thanks!

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• How to select the previous element of a given class

  - by JCN

  I have an UL list : <ul> <li data-sel='foo'></li> <li></li> <li data-sel='foo'></li> <li class='selected'></li> <li data-sel='foo'></li> </ul> I can access the first previous element of li.selected who do not have attribute data-sel=foo by using :not selector var element = $('.selected').prev("li:not([data-sel='foo'])"); But how can i access the first previous element of li.selected who have attribute data-sel=foo ?

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• Using jQuery find string A or B and replace based on css class and ID

  - by Jason

  Using jQuery, how do you check for and replace the occurrence of stringA or stringB when it falls under a specific css class and ID? stringA = " | " stringB = "|" css = .login #bav <p id="nav"> <a href="#">oh ya</a> | <a href="#" title="Password Lost and Found"></a> </p> I have variations of this: jQuery(document).ready(function($) { $(".login #nav").replaceText( /testA|testB/gi, "fooBar" ); }); });

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• Does the Liskov Substitution Principle apply to subtype which inherited from abstract class?

  - by A.A.

  loosely speaking, Liskov Substitution Principle states that a derived class can be substitute in place of the base class without affecting the user. In the case when the base class is an abstract class, which means no user is using an instance of the base class, does the Liskov inheritance restrictions still apply to the derived class?

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• what is the underlying data structure of a set c++?

  - by zebraman

  I would like to know how a set is implemented in C++. If I were to implement my own set container without using the STL provided container, what would be the best way to go about this task? I understand STL sets are based on the abstract data structure of a binary search tree. So what is the underlying data structure? An array? Also, how does insert() work for a set? How does the set check whether an element already exists in it? I read on wikipedia that another way to implement a set is with a hash table. How would this work?

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• how can protected members of base class be accessed during unit test?

  - by amateur

  I am creating a unit test in mstest with rhino mocks. I have a class A that inherits class B. I am testing class A and create an instance of it for my test. The class it inherits, "B", has some protected methods and protected properties that I would like to access for the benefit of my tests. For example, validate that a protected property on my base class has the expected value. Any ideas how I might access these protected properties of class B during my test?

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• Why does Java allow multiple inheritance from interfaces but not from abstract/concrete classes

  - by dan

  Why Java allows multiple inheritance from interfaces but not from abstract or concrete classes

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• Problem in reading configuration file from Class library project

  - by Newbie

  If I create an app.config file in a console apps like this <?xml version="1.0" encoding="utf-8" ?> <configuration> <appSettings> <add key ="key1" value ="val1"/> </appSettings> </configuration> and access the same from the console application like object sourcePath = System.Configuration.ConfigurationManager.AppSettings["key1"]; or by object sourcePath = System.Configuration.ConfigurationSettings.AppSettings["key1"]; I am able to get the value. But if I do the same thing in a class library project, I am getting a null value. Why? Where I am making mistake? I have added the proper reference System.Configuration. I am using C# 3.0

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• How to identify classes that implement an interface?

  - by AngryHacker

  I have a VB6 EXE project with a large amount of classes - everything compiles to an EXE, there are not COM DLLs built. Some of the classes implement the IDataProcessing interface. How can I programmatically determine the classes that implement that interface?

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• C++ increment operator

  - by Betamoo

  How to differentiate between overloading the 2 versions of operator ++ ? const T& operator ++(const T& rhs) which one? i++; ++i;

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• if (self = [super init]) vs. if ((self = [super init]))

  - by JOM

  Was just doing a code review and started to wonder: I thought if (self = [super init]) checks whether assigning return value of [super init] to variable self was successful or not (value of operation). Thus (self = nil) would actually be TRUE. I thought if ((self = [super init])) checks what is the value of self after assignment (value of variable). Thus ((self = nil)) would be FALSE. Which one is the correct way to use when initializing your own classes? Apple documentation uses the former one (for example here), which style I'm actually using now.

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• In Blackberry's Application class what is the difference between hasEventThread() and isHandlingEven

  - by Eric Sniff

  In Blackberry's Application class what is the difference between hasEventThread() and isHandlingEvents(). I'm just curious, because I have only found hasEventThread useful. From BB's docs for Applicaiton: public boolean hasEventThread() Determines if this application has entered the event dispatcher. Returns: True if this application has entered the event dispatcher (i.e. has invoked Application.enterEventDispatcher()); otherwise, false. isHandlingEvents public final boolean isHandlingEvents() Determines if this application has entered the event dispatch loop. Returns: True if the application has entered the event dispatch loop; otherwise, false. My only guess is that isHandlingEvents most happen sometime after hasEventThread. But is that really that useful?

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• How do I manipulate a tree of immutable objects?

  - by Frederik

  I'm building an entire application out of immutable objects so that multi-threading and undo become easier to implement. I'm using the Google Collections Library which provides immutable versions of Map, List, and Set. My application model looks like a tree: Scene is a top-level object that contains a reference to a root Node. Each Node can contain child Nodes and Ports. An object graph might look like this: Scene | +-- Node | +-- Node | +- Port +-- Node | +- Port +- Port If all of these objects are immutable, controlled by a top-level SceneController object: What is the best way to construct this hierarchy? How would I replace an object that is arbitrarily deep in the object tree? Is there a way to support back-links, e.g. a Node having a "parent" attribute?

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• The member [class] has no supported translation to SQL

  - by Code Sherpa

  Hi, I am getting the following error: Error Message:The member 'Company.ProductCore.Core.Domain.Account.Email' has no supported translation to SQL. My method looks like this: public Account GetAccountByEmail(string email) { Account account; using (WorkbookDataContext dc = _conn.GetContext()) { account = ( from a in dc.Accounts join em in dc.Emails on a.AccountId equals em.AccountId where a.Email.EmailAddress == email select a).FirstOrDefault(); } return account; } My Account class has a getter / setter that exposes Email: public Email Email { get { return _email; } set { _email = value; } } And my Email is a LINQ object. I have a feeling that the problem is that I am using a LINQ object for me Email property? I am new to LINQ and am not really sure why this is happening. Help appreciated, thanks...

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• When to use structs instead of classes?

  - by Earlz

  In C# when do structs make more sense to use than classes? What are some example scenarios? When should structs never be used?

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• class classname(value); & class classname=value; difference when constructor is explicit

  - by Mahesh

  When constructor is explicit, it isn't used for implicit conversions. In the given snippet, constructor is marked as explicit. Then why in case foo obj1(10.25); it is working and in foo obj2=10.25; it isn't working ? #include <iostream> class foo { int x; public: explicit foo( int x ):x(x) {} }; int main() { foo obj(10.25); // Not an error. Why ? foo obj2 = 10.25; // Error getchar(); return 0; } error: error C2440: 'initializing' : cannot convert from 'double' to 'foo'

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• How to implement copy operator for such C++ structure?

  - by Kabumbus

  So having struct ResultStructure { ResultStructure(const ResultStructure& other) { // copy code in here ? using memcpy ? how??? } ResultStructure& operator=(const ResultStructure& other) { if (this != &other) { // copy code in here ? } return *this } int length; char* ptr; }; How to implement copy? (sorry - I am C++ nube)

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• PHP - Class Inherit problem

  - by TatMing

  I have A.php and B.php A.php <?php error_reporting(E_ALL); ini_set("display_errors",1); class myClass { function hello() { return 'hello'; } } ?> B.php <?php error_reporting(E_ALL); ini_set("display_errors",1); require_once('/A.php'); $a = new myClass(); testing(); function testing() { echo $a ->hello(); } ?> B.php inherits A.php , if i run B.php,but it show "Fatal error: Call to a member function hello() on a non-object." So the question is simple, how can i correct this ,but "$a = new myClass();" is not inside the function, since in .NET world can do this, i believe PHP also possible. And one more question is, what is the modify of function in A.php ,if i have not state private/public/protected???

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• how to get the value from a textbox that is next to my text

  - by oo

  i have an html page where i have a table of items (one item per row) where each item is a html link that says "Add" and there is a textbox next to each link with a number in it. the text link and the textbox are in the same td inside the row of the table. how do i, using jquery, capture the value from the textbox that is to the right of the link i click on.

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• Class or interface expected error (java)

  - by David

  When i try to compile this: public static int compareCardhl (Card c1, Card c2) } if (c1.suit > c2.suit) return 1 ; if (c1.suit < c2.suit) return -1 ; if (c1.rank > c2.rank) return 1 ; if (c1.rank < c2.rank) return -1 ; return 0; } i get a lot of class or intereface expected errors. They all point at the if's. i also get a ; expected error at the end of Card c2). whats going wrong here?

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• How to create PHP method linking?

  - by Kerry

  I've seen other objects that do this: $obj->method1()->method2(); How do I do that? Is each function just modifying the pointer of an object or returning a pointer? I don't know the proper term for this style -- if anyone could help me with that, it would be great.

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• Java Package, Project , NoSuchMethod error

  - by hamam

  I have 2 projects linked and these 2 projects each have a package under them. XProject - XPackage - XClass - X1Method(); X2Method(); YProject - YPackage - YClass - Y1Method(); I'm trying to call X1 and X2 methods from Y1 Method. I can call X1 Method but when I call X2 method I get a runtime error (java.lang.NoSuchMethodError:) All methods are public and there is nothing wrong with method names. It is just nonsense to have one of them working while other is giving runtime errors. Any help would be appreciated. Thanks.

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• User class - 'load' data

  - by John

  <?php class User { private $id; private $username; public function __construct($id = null) { $this->id = $id; if (!is_null($this->id)) { $this->load(); } } public function load() { } } ?> In the 'load' method I am going to load all the information from the current user (id) But I wonder how is the best way to load all info. I could grab all data and then just assign all private variables, but I assume there must be another "cheaper" way to get all the data so I can use as such $this-variable; And not have to ASSIGN every single data row, I select in the load method. How?

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• Getting instance of a class in ArrayList

  - by user1499974

  I have a small problem with ArrayList. You see, I wish to get an instance of RenderNewHUD in my renderer class, which has a list of registered renderers. I did not want to create a variable for this due to limitations and awkwardness. Here is my code. RenderNewHUD hud = renderer.renderList.get(RenderNewHUD()); How exactly can I go along getting the instance of RenderNewHUD without creating a new instance? If you need any more of my code, just ask. Sorry if this is a very dumb question - I have looked EVERYWHERE for an answer.

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• Grails - how to save a domain object inside a Service ?

  - by w-

  I have a service and inside one of the functions i'm creating a domain object and trying to save it. when it gets to the save part, i get the error No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here What do i need to do in order to save a domain object inside of a service. everything on the internet makes it look like this should just work....

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