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• Rails subscription limitations

  - by David Lyod

  I have an application with set limits on subscription attributes i/e a user can have five projects for subscription A but have ten for subscription B At present I run a check on there current usage when linking to the create action and if they are over there limit I do not display the link to create a new project. On the view (for the new project ) I again run the check (in a helper) to see if they can create a new project and if they are not I display a message stating so and a little upgrade link. Is this a secure method of stopping a user bypassing there subscription attribute limitations ? What about direct PUT requests etc ?

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• Can a trait state if a C++ class has a default constructor?

  - by Vicente Botet Escriba

  Traits classes can be defined to check if a C++ class has a member variable, function or a type (see here). Curiously, the ConceptTraits do not include traits to check if a C++ class defines a default constructor or given constructor? Can traits be used to check the constructor presence? If yes, how? If not, why it is not possible?

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• What pitfalls (if any) are there to learning C/C++ as a first language?

  - by thyrgle

  Hi, I first learned C++ then moved to C (I know kind of backwards) and then I found a thing called iTunes U and began watching programming classes to extend my knowledge and noticed that Stanford and MIT both did not teach C or C++ as an introduction to computer programming. Then I began to wonder why they didn't begin teaching C/C++ because I thought C/C++ was more efficient than Java (which Stanford taught) and Python (which MIT taught). Or maybe there is no particular reason?

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• Block call in Ruby on Rails

  - by Mattias

  Hi, I'm trying to clean up my code and get rid of a lot of ugly hashes. In my views I define several actions like this: @actions = { :interest => {'Show interest', link_to(..), :disabled => true}, :follow => {'Follow this case', link_to(..)} ... } As these hashes grow, the maintainability decreases. I want to convert the above format to something like: actions do item :interest, 'Show interest', link_to(..), :disabled => true item :follow, 'Follow', link_to(..) ... end How do I structure my helper methods to allow this? Preferably the 'item'-method should only be available in the 'actions' block and not in the global scope. Thanks!

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• Can single-buffer blocking WSASend deliver partial data?

  - by CodeAngry

  I've pretty much always used send() with sockets and now I'm moving onto the WSA functions. With send(), I have a sendall() helper that ensured all data is delivered even if it didn't happen in one try and a partial send occurred on first call. So, instead of learning the hard way or over-complicating code when I don't have to, decided to ask you: Can a blocking WSASend() send partial data or does it send everything before it returns or fails? Or should I check the bytes sent vs. expected to send and keep at it until everything is delivered? ANSWER: Overlapped WSASend() does not send partial data but if it does, it means the connection has terminated. I've never encountered the case yet.

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• How to add two CSS Class to control in the code behind ?

  - by Space Cracker

  I am setting 2 css class in the code behind in ASP.NET I could either do: txtBox.Attributes.Add("class", "myClass1"); txtBox.Attributes.Add("class", "myClass2"); it's always apply one Class .. How can i add thw two classes ?

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• CSS: a:link vs just a (without the :link part)

  - by Rob

  So we're required to use the following order for CSS anchor pseudo-classes a:link { color: red } a:visited { color: blue } a:hover { color: yellow } a:active { color: lime } But my question is why bother with the a:link part? Rather, is there any advantage to the above (other than perhaps clarity) over: a { color:red; } /* notice no :link part */ a:visited { color: blue; } etc.,etc.

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• Is it possible for an abstract class to force it's children to have a constructor in PHP?

  - by Logan Serman

  I would like to do something like this: abstract class Foo { public function __construct() { echo 'This is the parent constructor'; } abstract function __construct(); } class Bar extends Foo { // constructor is required as this class extends Foo public function __construct() { //call parent::__construct() if necessary echo 'This is the child constructor'; } } But I get a fatal error when doing this: Fatal error: Cannot redeclare Foo::__construct() in Foo.php on line 8 Is there another way to ensure child classes have a constructor?

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• if i call an interface method will it get the method body from implementation class and execute ?

  - by sij

  please forgive me if i am wrong: I have an interface Interface1 I have its implementation Imple implements Interface (all methods hav been implemented :) ) now consider a third class CheckCall can I do a call in the class CheckCall like I mention below Interface1 interface1; interface1.method(); all necessary imports have been done. Please tell me is it possible or not , if not then ok and if yes then tell me what will happen if i have more than one impl classes for the same interface and i am doing the same call.

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• C++ how position indpendent code works for virtual function calls and more..?

  - by 0xDEAD BEEF

  How does PIC work for shared libraries which use virtual classes (ARM?). Is there any workaround so that i can access programm class object from shared library or vice versa?

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• Why does Joomla not use private, public and protected keywords?

  - by jax

  I noticed that Joomla uses less secure var type for variables in classes Why is this? In my own components,plugins,modules should I follow this convention or use a more secure private, public and protected keywords.

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• Initiatives to namespace PHP core and libraries

  - by James Maroney

  With the introduction of Object-Oriented and Namespacing capabilities in PHP, I am loving the new found cleanliness of PHP code that can be produced. The annoying thing though is that the core of PHP is still cluttered, unorganized mess of functions. Are there any initiatives to organize the PHP core and "common" libraries into namespaces and classes?

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• Where exactly must I create the fr.lproj localization file, for example?

  - by mystify

  Do you put it in "Other Resources"? Or "Resources-iPhone"? Or even in the Classes group? Or in the root of the project? What's the recommended place?

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• Business object and linq2SQL

  - by Overdose

  What is the optimal way to write the code which interacts with DB using linq2SQL? I need to add some business logic to the entities. So I guess there are two ways: Write some wrapper class. The main minus is that many fields are the same, so i don't feel it as DRY style. Add business logic methods to linq2sql entities(these classes are partial) directly ???

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• When should I consider representing the table-id ...?

  - by JMSA

  When should I consider representing the table-id columns as classes? When should I consider storing data as comma-separated values in a column in a DB table rather than storing them in different columns?

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• Is it the best practice to extract an interface for every class?

  - by the_drow

  I have seen code where every class has an interface that it implements. Sometimes there is no common interface for them all. They are just there and they are used instead of concreate objects. They do not offer a generic interface for two classes and are specific to the domain of the problem that the class solves. Is there any reason to do that?

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• Consuming REST based web services in .Net

  - by steve

  Greetings, I'm confused as to the best approach to make when consuming REST based web services with .Net. At the moment I'm using the System.net.webclient class. Should I be using Webresponse, webrequest classes in System.Net ? If I were to use another approach (Other than webclient) what disadvantages / advantages would I gain ? Thanks,

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• Using C++ from Objective C : how to allocate/deallocate?

  - by Dmitri Nesteruk

  Currently, my Objective C classes use C++ objects by doing a new when the owner is created, and calling delete when it is destroyed. But is there another way? I'd like to be able to declare, say, an auto_ptr whose scope lasts the duration of the Objective C class' lifetime.

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• What are the differences between various threading synchronization options in C#?

  - by user38834

  Can someone explain the difference between: lock (someobject) {} Using Mutex Using Semaphore Using Monitor Using Other .Net synchronization classes I just can't figure it out. It seems to me the first two are the same?

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• Why do we make a copy of final instance variable in a method in Java?

  - by PRK

  For instance: private final Object o; public void doSomething(){ final Object local = this.o; //access methods of local; } This practice is followed in lots of java classes (such as ArrayBlockingQueue). What's the benefit of this?

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• how to have minimum AreaRegistrations with putting duplicated elements in single place

  - by Sadegh

  hi all, i have several AreaRegistration classes which one each registers own routes and each one have some duplicated elements such as bolded text in below: context.MapRoute("Search", "**{culture}/{style}**/search", new { **culture = cultureValue, style = styleValue,** controller = "search", action = "default" }, new { **culture = new CultureRouteConstraint(), style = new StyleRouteConstraint()** }); how i can have minimum AreaRegistrations with putting duplicated elements in single place which handles that? this is possible?

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• Ruby On Rails - Collection Select - MYSQL Database - Problem Displaying ampersand ("&")

  - by dbkbaki

  I am having an annoying problem displaying the labels of a select box correctly where there is an ampersand contained within the label string. On a form being rendered with the form_for helper the collection_select reads data from a Mysql 5.075 database the text stored in the database is "Surabaya & Surrounding Areas" when rendered and displayed in firefox 3.6 or safari is is displaying as "Surabaya %amp; Surrounding Areas". The code used to render the select is as follows: <%= f.collection_select :parent_id, Destination.roots, :id, :name, {:include_blank => true} %> I have tried adding a h(:name) and also storing && in the database but it still will not display the ampersand correctly. Have searched on google for what I thought would be a simple solution but cant find anything that solves this. Using ROR 2.3.5/Ruby 1.8.7 If anyone has a solution it will be much appreciated. many thanks, David

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• One log4j.xml - many scripts

  - by psed

  One of my utility jar files is used by different nix scripts, located in different categories. Problem: unable to initialize log4j framework (unable to find log4j.xml). Solution, that allows to configure logger correctly while launching jar classes by different scripts - usage of env vars and force configuring using DOMConfigurtor.configure(pathToConfXml) method. is it possible to avoid path hardcoding and configure logger inside of a script? Appreciate all your help. Thanks.

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• importing class and its function from another file [Python]

  - by user343934

  Hi everyone, I am having little bit problem in importing classes in python. My work flow goes like this -index.py ---class template: ------def header(): ------def body(): ------def footer(): -display.py I want to call function header(), body() and footer () in my display.py page. Will anyone make me clear about this issue in python. Thanks for your concern.

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• C++ not recognizing my class

  - by rlb.usa

  I keep getting class undefined error from Visual Studio with my C++ code. My file looks like this: namespace myProject; scope myProject{ class FreeFormWindowsWidgetWindow : public WindowsWidget{ // shell } } But when I put FreeFormWindowsWidgetWindow in the same file as my other classes, it sees it. It doesn't seem to see anything in this file. How can I fix it and keep FreeFormWidgetWindow in its own file?

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