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• First TDD, Simple 2-tier C# Project - what do I unit test?

  - by Joel

  This is probably a stupid question but my googling isn't finding a satisfactory answer. I'm starting a small project in C#, with just a business layer and a data access layer - strangely, the UI will come later, and I have very little (read:no) concept / control over what it will look like. I would like to try TDD for this project. I'm using Visual Studio 2008 (soon to be 2010), I have ReSharper 5, and nUnit. Again, I want to do Test-Driven Development, but not necessarily the entire XP system. My question is - when and where do I write the first unit test? Do I only test logic before I write it, or do I test everything? It seems counter-productive to test things that have no reason to fail (auto-properties, empty constructors)...but it seems like the "No new code without a failing test" maxim requires this. Links or references are fine (but preferably to online resources, not books - I would like to get started ASAP). Thanks in advance for any guidance!

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• Is That REST API Really RPC? Roy Fielding Seems to Think So.

  - by Rich Apodaca

  A large amount of what I thought I knew about REST is apparently wrong - and I'm not alone. This question has a long lead-in, but it seems to be necessary because the information is a bit scattered. The actual question comes at the end if you're already familiar with this topic. From the first paragraph of Roy Fielding's REST APIs must be hypertext-driven, it's pretty clear he believes his work is being widely misinterpreted: I am getting frustrated by the number of people calling any HTTP-based interface a REST API. Today’s example is the SocialSite REST API. That is RPC. It screams RPC. There is so much coupling on display that it should be given an X rating. Fielding goes on to list several attributes of a REST API. Some of them seem to go against both common practice and common advice on SO and other forums. For example: A REST API should be entered with no prior knowledge beyond the initial URI (bookmark) and set of standardized media types that are appropriate for the intended audience (i.e., expected to be understood by any client that might use the API). ... A REST API must not define fixed resource names or hierarchies (an obvious coupling of client and server). ... A REST API should spend almost all of its descriptive effort in defining the media type(s) used for representing resources and driving application state, or in defining extended relation names and/or hypertext-enabled mark-up for existing standard media types. ... The idea of "hypertext" plays a central role - much more so than URI structure or what HTTP verbs mean. "Hypertext" is defined in one of the comments: When I [Fielding] say hypertext, I mean the simultaneous presentation of information and controls such that the information becomes the affordance through which the user (or automaton) obtains choices and selects actions. Hypermedia is just an expansion on what text means to include temporal anchors within a media stream; most researchers have dropped the distinction. Hypertext does not need to be HTML on a browser. Machines can follow links when they understand the data format and relationship types. I'm guessing at this point, but the first two points above seem to suggest that API documentation for a Foo resource that looks like the following leads to tight coupling between client and server and has no place in a RESTful system. GET /foos/{id} # read a Foo POST /foos/{id} # create a Foo PUT /foos/{id} # update a Foo Instead, an agent should be forced to discover the URIs for all Foos by, for example, issuing a GET request against /foos. (Those URIs may turn out to follow the pattern above, but that's beside the point.) The response uses a media type that is capable of conveying how to access each item and what can be done with it, giving rise to the third point above. For this reason, API documentation should focus on explaining how to interpret the hypertext contained in the response. Furthermore, every time a URI to a Foo resource is requested, the response contains all of the information needed for an agent to discover how to proceed by, for example, accessing associated and parent resources through their URIs, or by taking action after the creation/deletion of a resource. The key to the entire system is that the response consists of hypertext contained in a media type that itself conveys to the agent options for proceeding. It's not unlike the way a browser works for humans. But this is just my best guess at this particular moment. Fielding posted a follow-up in which he responded to criticism that his discussion was too abstract, lacking in examples, and jargon-rich: Others will try to decipher what I have written in ways that are more direct or applicable to some practical concern of today. I probably won’t, because I am too busy grappling with the next topic, preparing for a conference, writing another standard, traveling to some distant place, or just doing the little things that let me feel I have I earned my paycheck. So, two simple questions for the REST experts out there with a practical mindset: how do you interpret what Fielding is saying and how do you put it into practice when documenting/implementing REST APIs? Edit: this question is an example of how hard it can be to learn something if you don't have a name for what you're talking about. The name in this case is "Hypermedia as the Engine of Application State" (HATEOAS).

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• VBScript & Access MDB - 800A0E7A - "Provider cannot be found. It may not be properly installed"

  - by Perma

  Hey gang, I've having a problem with a VBScript connecting to an access MDB Database. My platform is Vista64, but the majority of resources out there are for ASP/IIS7. Quite simply, I can't get it to connect. I'm getting the following error: 800A0E7A - "Provider cannot be found. It may not be properly installed" My code is: Set conn = CreateObject("ADODB.Connection") strConnect = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\database.MDB" conn.Open strConnect So far I have ran %WINDIR%\System32\odbcad32.exe to try to configure the Driver in 32bit mode, but it hasn't done the trick. Any suggestions would be greatly appreciated

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• Edit TabControl template in Silverlight project

  - by philbrowndotcom

  I'm trying to modify the template for the TabControl in my silverlight application. I used Expression Blend to get the Template and copied it into my project. I did this before for Expander and got it to work with a few minor adjustments. The template for TabControl references the ns/assembly "clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls" and uses the TabPanel control from it. I can't seem to make a reference to this. I'm using silverlight 3 and .NET 3 Thanks <UserControl.Resources> <ControlTemplate x:Key="mytemplate" TargetType="sdk:TabControl"> <Grid> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualStateGroup.Transitions> <VisualTransition GeneratedDuration="0"/> </VisualStateGroup.Transitions> <VisualState x:Name="Normal"/> <VisualState x:Name="Disabled"> <Storyboard> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="DisabledVisualTop"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="DisabledVisualBottom"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="DisabledVisualLeft"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="DisabledVisualRight"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Grid x:Name="TemplateTop" Visibility="Collapsed"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <System_Windows_Controls_Primitives:TabPanel x:Name="TabPanelTop" Margin="2,2,2,-1" Canvas.ZIndex="1"/> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="0,0,3,3" MinWidth="10" MinHeight="10" Grid.Row="1"> <ContentPresenter x:Name="ContentTop" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalAlignment}"/> </Border> <Border x:Name="DisabledVisualTop" Background="#8CFFFFFF" CornerRadius="0,0,3,3" IsHitTestVisible="False" Opacity="0" Grid.Row="1" Grid.RowSpan="2" Canvas.ZIndex="1"/> </Grid> <Grid x:Name="TemplateBottom" Visibility="Collapsed"> <Grid.RowDefinitions> <RowDefinition Height="*"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <System_Windows_Controls_Primitives:TabPanel x:Name="TabPanelBottom" Margin="2,-1,2,2" Grid.Row="1" Canvas.ZIndex="1"/> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="3,3,0,0" MinWidth="10" MinHeight="10"> <ContentPresenter x:Name="ContentBottom" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalAlignment}"/> </Border> <Border x:Name="DisabledVisualBottom" Background="#8CFFFFFF" CornerRadius="3,3,0,0" IsHitTestVisible="False" Opacity="0" Canvas.ZIndex="1"/> </Grid> <Grid x:Name="TemplateLeft" Visibility="Collapsed"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <System_Windows_Controls_Primitives:TabPanel x:Name="TabPanelLeft" Margin="2,2,-1,2" Canvas.ZIndex="1"/> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="1" CornerRadius="0,3,3,0" MinWidth="10" MinHeight="10"> <ContentPresenter x:Name="ContentLeft" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalAlignment}"/> </Border> <Border x:Name="DisabledVisualLeft" Background="#8CFFFFFF" Grid.Column="1" CornerRadius="0,3,3,0" IsHitTestVisible="False" Opacity="0" Canvas.ZIndex="1"/> </Grid> <Grid x:Name="TemplateRight" Visibility="Collapsed"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="Auto"/> </Grid.ColumnDefinitions> <System_Windows_Controls_Primitives:TabPanel x:Name="TabPanelRight" Grid.Column="1" Margin="-1,2,2,2" Canvas.ZIndex="1"/> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="3,0,0,3" MinWidth="10" MinHeight="10"> <ContentPresenter x:Name="ContentRight" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalAlignment}"/> </Border> <Border x:Name="DisabledVisualRight" Background="#8CFFFFFF" CornerRadius="3,0,0,3" IsHitTestVisible="False" Margin="0" Opacity="0" Canvas.ZIndex="1"/> </Grid> </Grid> </ControlTemplate> </UserControl.Resources>

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• Finding the shortest path between two points on a grid, using Haskell.

  - by esperantist

  This is a problem that I can easily enough solve in a non-functional manner. But solving it in Haskell is giving me big problems. Me being inexperienced when it comes to functional programming is surely a reason. The problem: I have a 2D field divided into rectangles of equal size. A simple grid. Some rectangles are empty space (and can be passed through) while others are impassable. Given a starting rectangle A and a destination rectangle B, how would I calculate the shortest path between the two? Movement is possible only vertically and horizontally, in steps a single rectangle large. How would I go about accomplishing this in Haskell? Code snippets certainly welcome, but also certainly not neccessary. And links to further resources also very welcome! Thanks!

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• How to set up asp.net membership with a web application instead of a web project

  - by mwright

  Originally the site was set up using a Website project which ended up not working for various reasons. I'm trying to make it work as a web application project and have started from the ground up with a new project. I have looked online and not found a good resource that explains some of the "simple" things that are taken for granted when it's a website project. Some things specifically: How am I specifying the external sql database that the membership site should use? Is it possible to set privileges on a folder and require authentication when accessing that content or does each page need to check for itself? Once again, I'm looking for some resources I can use as I move forward as opposed to answers to specific questions (although those are welcome as well).

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• How to use Win32 SetCursor() with WPF resource and HwndHost

  - by Hank

  We have an HwndHost UIElement in our WPF application which is used to display Direct3d graphics, and the only way I have found to set a cursor for the HwndHost UIElment is to call the Win32 API SetCursor(). All of our cursors are resources in managed assemblies, and I would prefer to not change that, but I have not been able to find a way to load one of these cursors via any Win32 APIs like LoadImage(). Does anybody know how to get a handle(hCursor) to a cursor which is a resource in a managed assembly? Or, is there another way to set a cursor on an HwndHost displaying Direct3D graphics?

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• Error when starting a tab activity in Android?

  - by ATDeveloper

  I followed the directions verbatim in this Android tutorial, copying/pasting the code from the site to my app. http://developer.android.com/resources/tutorials/views/hello-tabwidget.html However, when I try to run in the Android emulator, I get the error: "The application Hello Tab Widget has stopped unexpectedly. Please try again." I tried debugging by introducing a breakpoint in the first line of the onCreate method, but the error occurs before the breakpoint is even hit. Any idea of what is going wrong, or any other way I can debug this issue? I am using Eclipse.

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• vBulletin Nightmare

  - by Chris

  I am creating a vBulletin forum community called: wehypnosis We purchased the vBulletin version 4.0 CMS and the SEO plugin. Im used to designing and building templates for drupal, wordpress and joomla. All of which have great documentation and many tutorials built by the community. But vBulletin although claimed as the best forum software on the internet, is missing any form of documentation worth reading. The only thing I can find to help me rebuild this monster is www.vbulletin.com/docs/ Does anyone know of a set of tutorials or any documentation which would help me: Configure a good solid working version? Give detailed instruction on how to build themes for vBulletin? Drupal has a mountain of great books and resources. Does vBulletin?

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• Symfony2 trans_default_domain is not working

  - by user1069843

  At the end of http://symfony.com/doc/current/book/translation.html#twig-templates I read about {% trans_default_domain "app" %} to set a translation domain for a whole template. But for me it does not work. Calling app/console translation:extract de --dir=src/ --output-dir=app/Resources/translations --output-format=xliff --keep Just puts all messages in the messages.de.xliff file. But if I set the domain manually for a given label like {{ label.name|trans({}, 'app') }} And execute the same extract command as above, then I get a new file app.de.xliff Is there anything more to do when using trans_default_domain?

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• WPF Resource Dictionary in a separate assembly

  - by Gustavo Cavalcanti

  I have resource dictionary files (MenuTemplate.xaml, ButtonTemplate.xaml, etc) that I want to use in multiple separate applications. I could add them to the applications' assemblies, but it's better if I compile these resources in one single assembly and have my applications reference it, right? After the resource assembly is built, how can I reference it in the App.xaml of my applications? Currently I use ResourceDictionary.MergedDictionaries to merge the individual dictionary files. If I have them in an assembly, how can I reference them in xaml? Thanks for your help! Gustavo

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• Android ConnectivityManager information

  - by Mike

  I am trying to get a better grip on Android's ConnectivityManager and how it really works under the hood. Using the API is simple enough but I am looking for something lower level such as when it starts and the dirty details of what its doing in the background. I can't seem to find a good resource about it. Everything is just about using the API. Does anyone understand this or have any resources that they could point me to, website, book, white paper, or otherwise? I would really appreciate it. Thanks

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• Rails link to current page and passing parameters to it

  - by Faisal

  I am adding I18N to my rails application by passing the locale using url params. My urls are looking like http://example.com/en/users and http://example.com/ar/users (for the english and arabic locales respectively). In my routes file, I have defined my routes with a :path_prefix option: map.resources :users, :path_prefix => '/:locale' And locale is being set using a before_filter defined in ApplicationController def set_locale I18n.locale = params[:locale] end I also defined ApplicationController#default_url_options, to add locale to all urls generated by the application: def default_url_options(options={}) {:locale => I18n.locale} end What I want is to add a link in the layout header (displayed in all pages) that would link to the same page but with the other locale. For instance, if I am browsing the arabic locale, I want a "English" link in the header, that will redirect me back to my current page, and set the locale to english. Is there a way to do this in rails?

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• Michael Hartl's rails tutorial: reusing sessions resource for multiple User types

  - by ntaj

  I'm learning Ruby on Rails through Micheal Hartl's tutorial. In my web application, I require two types of Users, called publishers and subscribers. Currently I have a publishers resource and a subscribers resource. I'd like both of them to be able to use the sessions resource for signin/signout. I'm looking for some direction on how to implement this. Should my publisher and subscriber resource inherit from the User resource, so that, for example, the following code works through polymorphism? def create user = User.find_by_email(params[:session][:email]) if user && user.authenticate(params[:session][:password]) # Sign the user in and redirect to the user's show page. else # Create an error message and re-render the signin form. end end The publisher and subscriber do not have many common fields and different capabilities, so I think they should be modeled as two separate resources, but how to have them share the Sessions resource?

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• How to Set Timeout for Ruby ODBC Driver for SQL Server?

  - by Seth Ladd

  Hello, I would like to know how to explicitly set a timeout for the Ruby DBI ODBC driver, when connecting to SQL Server. I would like long running queries to simply timeout and cancel themselves, saving further server resources and Rails processes. This was happening while we were using the ADO based Ruby driver, but now that we've switched to DBD::ODBC we are no longer experiencing timeouts. I've looked around but cannot find out how to set the query timeout value. I've tried explicitly setting some values in the driver, and specifying both Timeout and ConnectionTimeout and Connect Timeout in the DSN configuration for the connection. No luck. Your tips and advice are very appreciated. Thanks! Seth

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• Way to Remove Invite Limit on FBML Multi-Friend Selector

  - by David

  Hi there, I tried to look through various resources before posting here, but was having a surprisingly difficult time finding an answer to my question. Sorry in advance if I overlooked it. I'm currently trying to add the FBML Multi-Friend Selector to my Facebook page. It has a limit on the number of friends you can invite at a time ("Add up to 20 of your friends by clicking on their pictures below"). From what I've looked through it sounds like 20 is the max number of friends a user can invite, but then looking at Mint's page, they have a 22 max invite (http://www.facebook.com/mint?ref=ts) I thought it might be based on number of page fans, as Mint has 56,000, but that doesn't seem to be the case as this page only has 256 fans and have a max of 26 friend invites (http://www.facebook.com/tivix?v=app_106437999388442). Therefore, I don't really understand how this system works. Is there a way for me to increase to 26? Unlimited? Thanks for your help!

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• Python Comet Server

  - by HenryL

  I am building a web application that has a real-time feed (similar to Facebook's newsfeed) that I want to update via a long-polling mechanism. I understand that with Python, my choices are pretty much to either use Stackless (building from their Comet wsgi example) or Cometd + Twisted. Unfortunately there is very little documentation regarding these options and I cannot find good information online about production scale users of comet on Python. Has anyone successfully implemented comet on Python in a production system? How did you go about doing it and where can I find resources to implement my own?

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• Bug Running Android Tutorial HelloTabWidget under SDK 1.5: "setCurrentTag(getIntent())"

  - by Matt J.

  does not compile. Indeed: even in 1.5, this api, getIntent(), is already listed as deprecated. The error message I get complains that getIntent() does not return a String, but setCurrentTab() expects a string. If I guess and change the line to read: "tabHost.setCurrentTab(1); // was setCurrentTab(getIntent())", then it compiles, builds, but does not run. I get the "stopped unexpectedly" error message from the emulator. I cannot even get Log.d to output, so it seems that it stops 'unexpectedly' very early. So the first and main question is: what is the correct fix to "tabHost.setCurrentTab(getIntent())" in the final line of OnCreate() in http://developer.android.com/resources/tutorials/views/hello-tabwidget.html? The second and simpler question is: did I guess right in replacing 'mTabHost' with tabHost in the one place where that occurs?

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• Slow select when inserting large amounts of data (MYSQL)

  - by siannopollo

  I have a process that imports a lot of data (950k rows) using inserts that insert 500 rows at a time. The process generally takes about 12 hours, which isn't too bad. Normally doing a query on the table is pretty quick (under 1 second) as I've put (what I think to be) the proper indexes in place. The problem I'm having is trying to run a query when the import process is running. It is making the query take almost 2 minutes! What can I do to make these two things not compete for resources (or whatever)? I've looked into "insert delayed" but not sure I want to change the table to MyISAM. Thanks for any help!

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• using quartz with out the quartz plugin in grails

  - by user511875

  i'm trying to use quartz to schedule jobs in grails with out using the plugin. this is the code: RunMeTask.java package tt; public class RunMeTask { public void printMe() { System.out.println("Run Me ~"); }} resources.groovy (under conf/spring) import org.springframework.scheduling.quartz.JobDetailFactoryBean; import org.springframework.scheduling.quartz.SchedulerFactoryBean; import org.springframework.scheduling.quartz.SimpleTriggerBean; import tt.RunMeTask beans = { runMeTask(RunMeTask){ } runMeJob(JobDetailFactoryBean){ targetObject = ref('runMeTask') targetMethod = "printMe" } simpleTrigger(SimpleTriggerBean){ jobDetail = ref('runMeJob') repeatInterval = "5000" startpDelay = "1000" } schedulerFactoryBean(SchedulerFactoryBean){ jobDetails = [ref('runMeJob')] triggers = [ref('simpleTrigger')] } } i get the following exception: Error Fatal error during compilation org.apache.tools.ant.BuildException: java.lang.IncompatibleClassChangeError: class org.springframework.scheduling.quartz.SimpleTriggerBean has interface org.quartz.SimpleTrigger as super class (Use --stacktrace to see the full trace) can anyone help?

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• Using Objective-C blocks with old compiler

  - by H2CO3

  I'm using the opensource iPhone toolchain on Linux for developing for jailbroken iPhones. I'd like to take advantage of the new (4.0, 5.0) iOS SDK features, but I can't as my old build of GCC doesn't understand the ^ block syntax. I noticed that blocks are just of type id (struct objc_object *). I know this from two resources: first, class-dump reports them as id, second, Apple docs clarify that "blocks can be retained". My quiestion is, how can I take advantage of blocks using this knowledge? I thought of something like: // this is in SDK 4.x/5.x - (void) doSomethingWithBlock:((int)(^block)(int)); // and I modify it like: - (void) doSomethingWithBlock(id)block; the question is: HOW TO ACTUALLY CALL IT? How do I create blocks? I can, of course, create function pointers (IMPs in particular), but how to achieve the object-like memory layout?

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• How to setup ASP.NET Ajax Library and WCF Data Services

  - by Jronny

  I was following http://msdn.microsoft.com/en-us/magazine/ee336022.aspx but there were js errors. for example Sys is undefined So I added http://ajax.microsoft.com/ajax/act/40412/start.js. Then Sys.Data is undefined So I added http://ajax.microsoft.com/ajax/act/40412/MicrosoftAjaxDataContext.debug.js. But then TypeError: Sys.Data.OpenDataContext is not a constructor What shall I do to be able to call the service the way they do it on the first link? What are the scripts and resources needed? Thanks a lot.

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• are posix pipes lightweight?

  - by Nils Pipenbrinck

  In a linux application I'm using pipes to pass information between threads. The idea behind using pipes is that I can wait for multiple pipes at once using poll(2). That works well in practice, and my threads are sleeping most of the time and only wake up if there is something to do for them. On the user-space the pipes look just like two file-handles. Now I wonder wonder how much resources such a pipes use on the OS side. Btw: In my application I only send single bytes every now and then. Think about my pipes as simple message queues that allow me to wake-up receiving threads, tell them to send some status-data or to terminate.

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• [RESTful] Calculation with RESTful web service with MySQL database : )

  - by Dobby

  Dears, I am now making some RESTful web service with MySQL database. I used NetBeans to create the resources of RESTful service with MySQL, and now I can now using GET and POST/PUT to list and add/modify data entities in the MySQL server. Currently, I wish to make some calculations right after a client makes the POST activities, then the posted data with calculated results will be inserted into the MySQL database. I am very new to this, I guess I need to add some functions and call them to calculate but I don't know where and how to do that : ( Could any one help me on this issue? Thanks a lot in advance! : ) Best! Dobby

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• F# Static Member Type Constraints

  - by Stephen Swensen

  I'm trying to define a function, factorize, which uses structural type constraints (requires static members Zero, One, +, and /) similar to Seq.sum so that it can be used with int, long, bigint, etc. I can't seem to get the syntax right, and can't find a lot of resources on the subject. This is what I have, please help. let inline factorize (n:^NUM) = ^NUM : (static member get_Zero: unit->(^NUM)) ^NUM : (static member get_One: unit->(^NUM)) let rec factorize (n:^NUM) (j:^NUM) (flist: ^NUM list) = if n = ^NUM.One then flist elif n % j = ^NUM.Zero then factorize (n/j) (^NUM.One + ^NUM.One) (j::flist) else factorize n (j + ^NUM.One) (flist) factorize n (^NUM.One + ^NUM.One) []

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