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• What "exotic" language feature do you use every day?

  - by fmark

  For most programmers using procedural or object-oriented languages there is a language-feature lowest common denominator: variables, procedures, standard control structures, and classes. However, almost all languages add features on top of this. Recent C# versions have LINQ and delegates. C++ has template metaprogramming. Java has annotations. What features such as these do you use every day?

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• OK to throw an error for a missing required querystring parameter?

  - by Balazs

  Is there anything wrong with having an asp.net page throw a (custom error) if a a required querystring parameter is missing and having global.asax catch it with Application_Error, then transfer the user to an error page? I have several base classes that perform these checks and I am not sure of the best way to communicate the error to a user. So, something like this: int reqParam; if(!isParamSet("myReqParam", out reqParam)) { throw new QuerystringParamMissingException(); } which is then caught by Application_Error in global.asax.

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• How can I programmatically drop a SQL Server database from .NET code

  - by Craig Shearer

  I'm trying to drop a SQL Server database from .NET code. I've tried using the SMO classes but get an exception saying the database is in use. Then I tried executing a query (opening a SqlConnection, executing a SqlCommand), along the lines of: ALTER DATABASE foo SET SINGLE_USER WITH ROLLBACK IMMEDIATE (pause) DROP DATABASE foo But still I get an exception saying the database is in use. How do I do this? (Or, how does SQL Server Management Studio implement the Drop database and close existing connections?)

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• Graph diffing and versioning tool

  - by hashable

  I am working with a team that edits large DAGs represented as single files. Currently we are unable to work with multiple users concurrently modifying the DAG. Is there a tool (somewhat like the Eclipse SVN plugin) that can do do revision control on the file (manage timestamps/revision stamps) to identify incoming/outgoing/conflicting changes (Node/Link insertion/deletion/modification) and merge changes just like programmers do with source code files? The system should be able to do dependency management also. E.g. an incoming Link must not be accepted when one of the two Nodes is absent. That is, it should not "break" the existing DAG by allowing partial updates. If there is a framework to do this using generic "Node" and "Link" interfaces? Note: I am aware of Protege and its plugins. They currently do not satisfy my requirements.

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• C# - Dynamic Keyword and Interface Implementations

  - by Adam Driscoll

  I'm assuming this isn't possible but before digging further is there a way to do something like this: public void ProcessInterface(ISomeInterface obj) {} //... dynamic myDyn = GetDynamic<ISomeInterface>() ProcessInterface(myDyn); I've seen a post arguing for it but it sounds like it wasn't included. A little context: .Net assembly exposed through COM - Silverlight app consuming interface-implementing classes. Would be nice to refer to the objects by interface. I really don't expect that this was what was intended...

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• singleton inheritance question

  - by maxxtack

  how do i (and does it makes any sense?) inherit from the singleton class other classes that need the same functionality?

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• PHPUnit Command Line Include Path

  - by thatidiotguy

  So I have a project structure like so: MyProject/ src/ //subfolders and source code ..... tests/ package/ MyTest.php I am trying to run the unit tests in MyTest.php with PHPUnit but it has a use statement for PHP classes located in the src folder. So I tried to use the include-path directive for PHPUnit like so: (I am in the directory with MyTest.php) phpunit --include-path ~/workspace/MyProject/src/ MyTest Unfortunately execution is halting at the first use statement. What gives?

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• AutoGen DB models for ASP .NET

  - by Tereno

  Hi there, I am wondering if there's anything out there for ASP .NET that is similar to Django or Ruby on Rails. Specifically, I'm looking for something that allows me to auto-generate the database models by specifying my classes in the controller and what not. Would I be able to achieve those functionality with IronPython or IronRuby? Thanks!

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• Naming member functions/methods with a single underscore, good style or bad?

  - by Extrakun

  In some languages where you cannot override the () operator, I have seen methods with a single underscore, usually for 'helper' classes. Something likes this: class D10 { public function _() { return rand(1,10); } } Is it better to have the function called Roll()? Is a underscore fine? After all, there is only one function, and it removes the need to look up the name of the class. Any thoughts?

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• Autofac wiring question - beginner

  - by user645788

  Beginners question: Given two classes: Myclass5 and Myclass6 how can one wire up following factory method (returned as Func) such that myclass5 and myclass6 instances and IMyClass that they depend on are all retrieved via autofac (assuming that these three instances are registered). public static MyClass4 FactoryMethod(int nu) { if (nu == 1) return new MyClass5(....); if (nu == 4) return new MyClass6(....); throw new NotImplementedException(); } public abstract class MyClass4 { } public class MyClass5 : MyClass4 { public MyClass5(int nu, IMyClass a) { } } public class MyClass6 : MyClass4 { public MyClass6(int nu, IMyClass a) { } }

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• System.Uri("") in default browser?

  - by Hallgaws

  I am using special program where it loads some url imagine it like window with automatically load www.google.com - program starts and it load the site - BUT when you click on some links in the program window it opens in default browser - how it can be opened in default browser - I am using this code: <Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _ Partial Class Form1 Inherits System.Windows.Forms.Form <System.Diagnostics.DebuggerNonUserCode()> _ Protected Overrides Sub Dispose(ByVal disposing As Boolean) Try If disposing AndAlso components IsNot Nothing Then components.Dispose() End If Finally MyBase.Dispose(disposing) End Try End Sub Private components As System.ComponentModel.IContainer <System.Diagnostics.DebuggerStepThrough()> _ Private Sub InitializeComponent() Me.components = New System.ComponentModel.Container Dim resources As System.ComponentModel.ComponentResourceManager = New System.ComponentModel.ComponentResourceManager(GetType(Form1)) Me.WB = New System.Windows.Forms.WebBrowser ..... ..... Me.WB.Url = New System.Uri("http://www.google.com/", System.UriKind.Absolute) Using Visual Basic 2008

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• c# reading code inside a method

  - by koraytaylan

  i'm playing around with c# reflection api. i can easily load type info of classes, methods etc. in an assembly. now i wonder how can i load and read the code inside a method?

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• Hibernate. How can we set name of PK/FK using annotations?

  - by Max

  We have hibernate-based system and customer wants to get human-readable names of PK and FK. In our project we use annotated entity classes. Is it renaming possible?

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• C# socket blocking behavior

  - by Gearoid Murphy

  My situation is this : I have a C# tcp socket through which I receive structured messages consisting of a 3 byte header and a variable size payload. The tcp data is routed through a network of tunnels and is occasionally susceptible to fragmentation. The solution to this is to perform a blocking read of 3 bytes for the header and a blocking read of N bytes for the variable size payload (the value of N is in the header). The problem I'm experiencing is that occasionally, the blocking receive operation returns a partial packet. That is, it reads a volume of bytes less than the number I explicitly set in the receive call. After some debugging, it appears that the number of bytes it returns is equal to the number of bytes in the Available property of the socket before the receive op. This behavior is contrary to my expectation. If the socket is blocking and I explicitly set the number of bytes to receive, shouldn't the socket block until it recv's those bytes?, any help, pointers, etc would be much appreciated.

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• How to explain to a client that you've gone over-budget and you'll need more money/time to deliver w

  - by General Tapioca

  My situation is that I have agreed on a per-project proposal with the client. The proposal is vague, but still names functionality in a way that can be argued as to whether it's included or not, while leaving some room for interpretation. I originally pressed as much as I could to get a per-month contract, arguing that the project is mostly non-predictable, but the client refused. Being a small company, I had to fold and signed a contract on an estimate based on my group's estimations. At this point we have reached completion on about 85% of the features (we think) but we ran out of budget. We have been working for almost two years with this client in previous contracts, and we have delivered a good product that they are happy with, so we have a good standing relationship. More info: -There has been a bit of scope-creep, but I don't think enough for me to hide behind that argument -We've been delivering partial releases about monthly. -We don't have systematic user-testing in place.

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• How to learn proper C++?

  - by Chris

  While reading a long series of really, really interesting threads, I've come to a realization: I don't think I really know C++. I know C, I know classes, I know inheritance, I know templates (& the STL) and I know exceptions. Not C++. To clarify, I've been writing "C++" for more than 5 years now. I know C, and I know that C and C++ share a common subset. What I've begun to realize, though, is that more times than not, I wind up treating C++ something vaguely like "C with classes," although I do practice RAII. I've never used Boost, and have only read up on TR1 and C++0x - I haven't used any of these features in practice. I don't use namespaces. I see a list of #defines, and I think - "Gracious, that's horrible! Very un-C++-like," only to go and mindlessly write class wrappers for the sake of it, and I wind up with large numbers (maybe a few per class) of static methods, and for some reason, that just doesn't seem right lately. The professional in me yells "just get the job done," the academic yells "you should write proper C++ when writing C++" and I feel like the point of balance is somewhere in between. I'd like to note that I don't want to program "pure" C++ just for the sake of it. I know several languages. I have a good feel for what "Pythonic" is. I know what clean and clear PHP is. Good C code I can read and write better than English. The issue is that I learned C by example, and picked up C++ as a "series of modifications" to C. And a lot of my early C++ work was creating class wrappers for C libraries. I feel like my own personal C-heavy background while learning C++ has sort of... clouded my acceptance of C++ in it's own right, as it's own language. Do the weathered C++ lags here have any advice for me? Good examples of clean, sharp C++ to learn from? What habits of C does my inner-C++ really need to break from? My goal here is not to go forth and trumpet "good" C++ paradigm from rooftops for the sake of it. C and C++ are two different languages, and I want to start treating them that way. How? Where to start? Thanks in advance! Cheers, -Chris

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• wordpress use table sort functionality in own plugin

  - by choise

  Hi, im creating a own plugin for wordpress where i have to view a set of data. now i want to use the wordpress default table view to display my data, and give some functionality to it default table: is there a way to use this table view for my own plugins (some classes or functions) or do i have to create something similar by myself?

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• What is a stack overflow?

  - by Donna

  I am getting messages showing stack overflow on line 26 and 27. What is this and how can I resolve the issue? I am an online student and this is really messing me up with my classes.

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• Which design pattern should be used to create an emulator?

  - by Facon

  I have programmed an emulator, but I have some doubts about how to organizate it properly, because, I see that it has some problems about classes connection (CPU <- Machine Board). For example: I/O ports, interruptions, communication between two or more CPU, etc. I need for the emulator to has the best performance and good understanding of the code. PD: Sorry for my bad English. EDITED - Asking for multiple patterns.

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• In a PHP project, how do you organize and access your helper objects?

  - by Pekka

  How do you organize and manage your helper objects like the database engine, user notification, error handling and so on in a PHP based, object oriented project? Say I have a large PHP CMS. The CMS is organized in various classes. A few examples: the database object user management an API to create/modify/delete items a messaging object to display messages to the end user a context handler that takes you to the right page a navigation bar class that shows buttons a logging object possibly, custom error handling etc. I am dealing with the eternal question, how to best make these objects accessible to each part of the system that needs it. my first apporach, many years ago was to have a $application global that contained initialized instances of these classes. global $application; $application->messageHandler->addMessage("Item successfully inserted"); I then changed over to the Singleton pattern and a factory function: $mh =&factory("messageHandler"); $mh->addMessage("Item successfully inserted"); but I'm not happy with that either. Unit tests and encapsulation become more and more important to me, and in my understanding the logic behind globals/singletons destroys the basic idea of OOP. Then there is of course the possibility of giving each object a number of pointers to the helper objects it needs, probably the very cleanest, resource-saving and testing-friendly way but I have doubts about the maintainability of this in the long run. Most PHP frameworks I have looked into use either the singleton pattern, or functions that access the initialized objects. Both fine approaches, but as I said I'm happy with neither. I would like to broaden my horizon on what is possible here and what others have done. I am looking for examples, additional ideas and pointers towards resources that discuss this from a long-term, real-world perspective. Also, I'm interested to hear about specialized, niche or plain weird approaches to the issue. Bounty I am following the popular vote in awarding the bounty, the answer which is probably also going to give me the most. Thank you for all your answers!

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• Which Exception class to choose

  - by PaN1C_Showt1Me

  Suppose you want to throw Exception like this: 'Project with the provided ID cannot be assigned.' and you don't want to write your custom Exception class. What predefined Exception class would you use for this? (I'm talking about all classes inheriting from Exception)

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• disposing a class loader

  - by java_geek

  I am using a custom class loader which extends URLClassLoader. I load some classes into my custom class loader and perform some task. Once the task is completed i want to dispose of the class loader. I tried doing that by setting the reference to null. But this does not garbage collect the class loader. Is there a way that can help what i want to achieve?

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• memory usage by objects in common lisp

  - by Farzad Bekran

  Is there a way to find out how much memory is used by an instance of a class or basic data types in general? I have a toy webframework in cl that creates and manages web pages with instances of classes that represent the html tags and their properties, and as they are supposed to make an html page, they have children in a slot called children. so I was thinking how much a user's session will cost the server if I take this approach. Thanks.

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• What is the most elegant way to implement a business rule relating to a child collection in LINQ?

  - by AaronSieb

  I have two tables in my database: Wiki WikiId ... WikiUser WikiUserId (PK) WikiId UserId IsOwner ... These tables have a one (Wiki) to Many (WikiUser) relationship. How would I implement the following business rule in my LINQ entity classes: "A Wiki must have exactly one owner?" I've tried updating the tables as follows: Wiki WikiId (PK) OwnerId (FK to WikiUser) ... WikiUser WikiUserId (PK) WikiId UserId ... This enforces the constraint, but if I remove the owner's WikiUser record from the Wiki's WikiUser collection, I recieve an ugly SqlException. This seems like it would be difficult to catch and handle in the UI. Is there a way to perform this check before the SqlException is generated? A better way to structure my database? A way to catch and translate the SqlException to something more useful? Edit: I would prefer to keep the validation rules within the LINQ entity classes if possible. Edit 2: Some more details about my specific situation. In my application, the user should be able to remove users from the Wiki. They should be able to remove any user, except the user who is currently flagged as the "owner" of the Wiki (a Wiki must have exactly one owner at all times). In my control logic, I'd like to use something like this: wiki.WikiUsers.Remove(wikiUser); mRepository.Save(); And have any broken rules transferred to the UI layer. What I DON'T want to have to do is this: if(wikiUser.WikiUserId != wiki.OwnerId) { wiki.WikiUsers.Remove(wikiUser); mRepository.Save(); } else { //Handle errors. } I also don't particularly want to move the code to my repository (because there is nothing to indicate not to use the native Remove functions), so I also DON'T want code like this: mRepository.RemoveWikiUser(wiki, wikiUser) mRepository.Save(); This WOULD be acceptable: try { wiki.WikiUsers.Remove(wikiUser); mRepository.Save(); } catch(ValidationException ve) { //Display ve.Message } But this catches too many errors: try { wiki.WikiUsers.Remove(wikiUser); mRepository.Save(); } catch(SqlException se) { //Display se.Message } I would also PREFER NOT to explicitly call a business rule check (although it may become necessary): wiki.WIkiUsers.Remove(wikiUser); if(wiki.CheckRules()) { mRepository.Save(); } else { //Display broken rules }

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• How to add imports to groovysh on startup?

  - by ipolevoy

  I'm working on a project where I'd like users to experiment with Java classes on Groovysh. I'd like to make it convenient for them and want to import certain packages by default, when groovysh starts up so that users would not have to re-type the same imports every time they start the shell. Does anyone know how to accomplish this? Thanks in advance, igor

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