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  • How to correctly and standardly compare floats?

    - by DIMEDROLL
    Every time I start a new project and when I need to compare some float or double variables I write the code like this one: if (fabs(prev.min[i] - cur->min[i]) < 0.000001 && fabs(prev.max[i] - cur->max[i]) < 0.000001) { continue; } Then I want to get rid of these magic variables 0.000001(and 0.00000000001 for double) and fabs, so I write an inline function and some defines: #define FLOAT_TOL 0.000001 So I wonder if there is any standard way of doing this? May be some standard header file? It would be also nice to have float and double limits(min and max values)

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  • Fix position of image

    - by andrei
    I have this list http://pastebin.me/dde64f8c185de9dd5e429f84701a01ce Anytime you click on an image extra content appears . I have tryed several css methods but i cant get the images to remain in their position and get the text to go underneath . Anyone has a solution ?

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  • Align 2 sets of 2D point clouds

    - by user108088
    From what I gather, there are two major methods to perform alignment on point clouds, Iterative Closest Point (ICP) and Particle Filtering. What are the advantages of each method? And can someone point me some good tutorials. For what I am currently doing, I think ICP would be easier, I can't seem to find any simple reference implementations online for 2d point sets. Has anyone seen (psuedo)code for ICP with details on the transformation step? Thanks in advance.

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  • Conditional Required Attribute for validation

    - by jeriley
    We're trying to get a conditional attribute to work, case in point, there's a boolean (checkbox) that if checked, its related text is required. So, ideally we'd have something like ... public bool Provision { get; set; } [ConditionalRequirement(IsNeededWhenTrue = Provision)] public string ProvisionText { get; set; } Is this even possible? Alternate idea (not as elegant?) public bool Provision2 { get; set; } [PropertyRequired(RequiredBooleanPropertyName = "Provision2")] public string Provision2Text { get; set; } I'd hate to use the magic string method ... but any other ideas?

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  • Variable scope and the 'using' statement in .NET

    - by pete the pagan-gerbil
    If a variable is at class level (ie, private MyDataAccessClass _dataAccess;, can it be used as part of a using statement within the methods of that class to dispose of it correctly? Is it wise to use this method, or is it better to always declare a new variable with a using statement (ie, using (MyDataAccessClass dataAccess = new MyDataAccessClass()) instead of using (_dataAccess = new MyDataAccessClass()))?

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  • FileInfo.MoveTo() vs File.Move()

    - by Eric
    Is there any difference between these two methods of moving a file? System.IO.FileInfo f = new System.IO.FileInfo(@"c:\foo.txt"); f.MoveTo(@"c:\bar.txt"); //vs System.IO.File.Move(@"c:\foo.txt", @"c:\bar.txt");

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  • Web Service Authentication in C# Web Application i.e Details on Digest and Basic Authentication

    - by NSK
    Details on all Web Service Authentication methods and How to apply those?? i.e Way to apply Basic and Digest Authentication in C# Web Application. More: I'm creating a Web Service and want to deploy it on IIS 5.0. In order to authenticate user I want to use Digest Authentication. How this is done? The authentication should contain some through which the user is checked inside database for authentication and then if valid user then return success or else failure...

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  • iPhone - extending a class delegate

    - by Digital Robot
    OK, I know how to create a class extension, using something like that: on .h @interface UIButton (myExtensionName) // my extended methods @end and then on .m @implementation UIButton (myExtensionName) // my implementations @end But how do I declare the extended delegates I may create? If this was a normal class I would do @protocol myExtensionName <NSObject> // my delegate declarations @end but how do I do that on a class extension? thanks

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  • AdWhirl implementation in iPhone Cocoa touch

    - by user571283
    Hi dudes, i'm starting to implement AdWhirl in my application. i follow the instructions which is belong to adwhirl but i cant see any ad in my application.i add the following methods in my viewcontroller class - (void)viewDidLoad { [super viewDidLoad]; AdWhirlView *adView=[AdWhirlView requestAdWhirlViewWithDelegate:self]; [self.view addSubview:adView]; } -(NSString *) adWhirlApplicationKey{ return @"myAdWhirlKey"; } -(UIViewController *) viewControllerForPresentingModalView{ return self; } i doesn't display anything. please help how to implement AdWhirl

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  • Why does s ++ t not lead to a stack overflow for large s?

    - by martingw
    I'm wondering why Prelude> head $ reverse $ [1..10000000] ++ [99] 99 does not lead to a stack overflow error. The ++ in the prelude seems straight forward and non-tail-recursive: (++) :: [a] -> [a] -> [a] (++) [] ys = ys (++) (x:xs) ys = x : xs ++ ys So just with this, it should run into a stack overflow, right? So I figure it probably has something to do with the ghc magic that follows the definition of ++: {-# RULES "++" [~1] forall xs ys. xs ++ ys = augment (\c n -> foldr c n xs) ys #-} Is that what helps avoiding the stack overflow? Could someone provide some hint for what's going on in this piece of code?

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  • Best options for image resizing

    - by Claudio Redi
    Hi, I have resize images exceeding a max size. Methods I tried so far are not good enough :-( System.Drawing.Image.GetThumbnailImage generates very poor quality images in general. Playing with options like this one I can generate better images in quality but heavier than the original one. Probably the second option (or something similar) is the best option and I would need to resize using the proper options. Any advice?

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  • WCF Compare objects on client

    - by Petoj
    Well i have a WCF service and has to methods one that gives a list of a object and one that gives a list of objects.. the object returned from method one is part of the list from method two. Im using wpf and binding a combo box to the two the results.. but the problem is that the combo box dosent know how to compare the objects as WCF did not generate this for me.. is there some way to fix this??

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  • Calling and consuming a JBoss Web Service from JavaScript (AJAX)

    - by Andreas Grech
    I am fiddling around with JBOSS's Web Services, and I have created the following: http://127.0.0.1:8080/IM/TestService?wsdl Now I need to access Web Methods from that Web Service from JavaScript. Say I have a web method named foo in TestService, how do I make an ajax call to it? I tried accessing the method via http://127.0.0.1:8080/IM/TestService/foo, but I'm getting an HTTP Status 404.

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  • When should I use a struct instead of a class?

    - by Esteban Araya
    MSDN says that you should use structs when you need lightweight objects. Are there any other scenarios when a struct is preferable over a class? Edit: Some people have forgotten that: 1. structs can have methods! 2. structs have no inheritance capabilites. Another Edit: I understand the technical differences, I just don't have a good feel for WHEN to use a struct.

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  • make a lazy var in scala

    - by ayvango
    Scala does not permit to create laze vars, only lazy vals. It make sense. But I've bumped on use case, where I'd like to have similar capability. I need a lazy variable holder. It may be assigned a value that should be calculated by time-consuming algorithm. But it may be later reassigned to another value and I'd like not to call first value calculation at all. Example assuming there is some magic var definition lazy var value : Int = _ val calc1 : () => Int = ... // some calculation val calc2 : () => Int = ... // other calculation value = calc1 value = calc2 val result : Int = value + 1 This piece of code should only call calc2(), not calc1 I have an idea how I can write this container with implicit conversions and and special container class. I'm curios if is there any embedded scala feature that doesn't require me write unnecessary code

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  • Raising events vs direct method calls differences

    - by dotnetdev
    Hi Raising an event, will call its event handler. eg http://msdn.microsoft.com/en-us/library/aa645739%28VS.71%29.aspx What is the difference between using the events mechanism and direct calls to other methods (eg if a condition is met in method A(), call B() )? And what is the difference between consuming and raising events? Thanks

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