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  • Another void C# question

    - by Jim Jones
    Have a type in the header files I'm working with called VTVOID it is the type of a struct element and a number of parameters. In the header file defining types is the line #define VTVOID void I read in another discussion the void maps to System.Void however when I plug that into the C# code I get the error "System.Void cannot be used in C# -- use typeof(void) to get the void object." So what type do I plug in? Jim

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  • R - indirectly calling a matrix using a string

    - by Boris Senderovich
    Example: There is a matrix of data called VE There is a vector of string where the first element is the string VE. I need to indirectly call the string and be able to access data. For example if I need the 6th column of matrix VE then I want to do: Vector[1][,6] Essentially I need R to start reading those string as if they are the matrix names that are already in this page. I need this syntax to be dynamic because I am putting it in a loop.

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  • c++ property class structure

    - by Without me Its just Aweso
    I have a c++ project being developed in QT. The problem I'm running in to is I am wanting to have a single base class that all my property classes inherit from so that I can store them all together. Right now I have: class AbstractProperty { public: AbstractProperty(QString propertyName); virtual QString toString() const = 0; virtual QString getName() = 0; virtual void fromString(QString str) = 0; virtual int toInteger() = 0; virtual bool operator==(const AbstractProperty &rightHand) = 0; virtual bool operator!=(const AbstractProperty &rightHand) = 0; virtual bool operator<(const AbstractProperty &rightHand) = 0; virtual bool operator>(const AbstractProperty &rightHand) = 0; virtual bool operator>=(const AbstractProperty &rightHand) = 0; virtual bool operator<=(const AbstractProperty &rightHand) = 0; protected: QString name; }; then I am implementing classes such as PropertyFloat and PropertyString and providing implementation for the comparator operators based on the assumption that only strings are being compared with strings and so on. However the problem with this is there would be no compiletime error thrown if i did if(propertyfloat a < propertystring b) however my implementation of the operators for each derived class relies on them both being the same derived class. So my problem is I cant figure out how to implement a property structure so that I can have them all inherit from some base type but code like what I have above would throw a compile time error. Any ideas on how this can be done? For those familiar with QT I tried using also a implementation with QVariant however QVariant doesn't have operators < and defined in itself only in some of its derived classes so it didn't work out. What my end goal is, is to be able to generically refer to properties. I have an element class that holds a hashmap of properties with string 'name' as key and the AbstractProperty as value. I want to be able to generically operate on the properties. i.e. if I want to get the max and min values of a property given its string name I have methods that are completely generic that will pull out the associated AbstactProperty from each element and find the max/min no matter what the type is. so properties although initially declared as PropertyFloat/PropertyString they will be held generically.

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  • Prototype Selector : simple examples

    - by kevinb92
    Hi, i'm just starting prototype, i was on jquery before. I can't find easy examples on the internet about how : Selecting all elements having the same id on a page (i'm doing this but it only works for the first element : $('mydiv').hide() ) Selecting a div that is contained in another div by their id. hiding all elements that have myClass class.

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  • STL map - insert or update

    - by CodeJunkie
    I have a map of objects and I want to update the object mapped to a key, or create a new object and insert into the map. The update is done by a different function that takes a pointer to the object (void update(MyClass *obj)) What is the best way to "insert or update" an element in a map?

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  • Create form select from object containing values

    - by marks34
    I have such an object : var options = {1: 'Running', 2: 'Falling', 3: 'Collapsing wall', 4: (...)}; I'd like to create form's select element with ooptions taken from this object, so something like that (code I tried which is not working, but you can get the idea) : html = '<form action="" ><select name="block-action"><option>-------</option>'; for(k in obj){ html += '<option value="'+k+'">'+obj[k]+'</option>' } html += '</select></form>'

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  • HTML 5: how to make stackable images?

    - by Bobafett
    Is it possible to load up 10 images (same dimension), stack them on top of one another only showing 1 image at a time and then by holding down the left mouse button and dragging the mouse up you scroll in one direction and moving the mouse down scrolls in the opposite direction?' if so how can this be done? canvas element would be the begining, no?

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  • In jQuery, is there any way to only bind a click once?

    - by Chris Henry
    I have an ajax app that will run functions on every interaction. I'd like to be able to run my setup function each time so all my setup code for that function remains encapsulated. However, binding elements more than once means that the handler will run more than once, which is obviously undesirable. Is there an elegant way in jQuery to call bind on an element more than once without the handler being called more than once?

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  • How to set clickable and highlightable a View?

    - by Pentium10
    I have ViewStubs in my layout. If I set clickable and implement the OnClickListener this does work only on the root of the element. But the layout holds parent elements, and when I click on those the click is not recognized. How do I make a full row/view of ViewStub as whole to be clickable and highlightable like a ListView elements? Also what do I have to add to get that orange highlight?

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  • postgres subquery w/ derived column

    - by Wells
    The following query won't work, but it should be clear what I'm trying to do: split the value of 't' on space and use the last element in that array in the subquery (as it will match tl). Any ideas how to do this? Thanks! SELECT t, y, "type", regexp_split_to_array(t, ' ') as t_array, sum(dr), ( select uz from f.tfa where tl = t_array[-1] ) as uz, sc FROM padres.yd_fld WHERE y = 2010 AND pos <> 0 GROUP BY t, y, "type", sc;

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  • Ignoring namespace prefix while parsing xml

    - by Rachel
    If a xhtml file has namespace prefixes in the document and the namespace for the prefixes is not defined, is it possible to ignore the prefixes and still parse the file when using SAX parser. Is there a way to get rid of the error "The prefix for element is not bound." without defining the namespace for the prefixes while parsing?

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  • Pass windows authentication username to asp variable

    - by Darren Cook
    Hi, I have a site that processes orders taken by phone into a SQL database. Access to the portal uses Windows Authentication and I would like to pass the username of the order processor along with the order so that I can record who has taken the order. How can I pass the user name to a form element? The pages are written in classic asp. Thanks.

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  • reference a form inside a selector in jquery

    - by ooo
    if i have this code in jquery: var parentDiv = $(this).parent('.copyInstance'); inside this div there is a form. how do i reference a form element inside this selector? i want something like this $.post($(parentDiv + " Form").attr('action'), $(parentDiv + " Form").serialize(), function(data) { }); but this above doesn't seem to work

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  • My App working fine in Samsung but acting weird in HTC Desire S?

    - by Neerav Shah
    I have created an app demo app using cordova2.7 the app only contains a search box and two buttons in header and the same in the content field. When run the app in Emulator its working fine and then i tried to run it in Samsung mobile its working fine but when i tried to run it in HTC Desire S when i try to enter character to search element its dispalys some white box above the header and when i try to enter the character in the serach field that i have in the content field it does not show the keypad.Please refer the snapshot I have uploaded below from HTC Desire S

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  • selenium IDE clickAndWait xpath

    - by user121196
    In selenium IDE, I need to click on the nth link that has text 'XXX'. How can this be done? <tr> <td>clickAndWait</td> <td>//a[text()='XXX'][${link}]</td> <td></td> </tr> The above code says [error] Element //a[text()='XXX'][9] not found even though it's valid,

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  • c# 3.5 class List<int> class initialisation

    - by josephj1989
    I can initialize a List like new List{1,2,3,4,5}; However List does not have a constructor which accepts a single parameter. So I tried to run this through the debugger and it seems to be calling the Add method. So how does the compiler know which method to invoke to add each individual element. This may be a silly question but I am a bit confused. Thanks

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  • Generate sample XML from composite hierarchical structure

    - by Jevgenij Nekrasov
    Let's say I have composite hierarchical structure. Each object in the structure has child collection of the same objects. Each object has XPath property, which stores the exact xpath to the element inside XML file. Right now I am trying to create an extension, which can generate XML string from that hierarchical structure, but first I want to make some sort of research what is the most efficient way to do that? ant what is the easiest way?

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  • CSS: Namespace a piece of HTML

    - by Paul Tarjan
    I'm building a browser extension that will insert a chunk of HTML into some pages. I'd like the page's CSS to not apply to this section. What is the best way to do this? Is there a good reset I can put on the root element of my HTML and set it to !important so it gets applied after others?

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  • Simple prolog program. Getting error: >/2: Arguments are not sufficiently instantiated

    - by user1279812
    I made a prolog program posAt(List1,P,List2) that tests whether the element at position P of List1 and List2 are equal: posAt([X|Z],1,[Y|W]) :- X=Y. posAt([Z|X],K,[W|Y]) :- K1, Kr is K - 1, posAt(X,Kr,Y). When testing: ?- posAt([1,2,3],X,[a,2,b]). I expected an output of X=2 but instead I got the following error: ERROR: /2: Arguments are not sufficiently instantiated Why am I getting this error?

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