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  • Generic linked list in c++

    - by itsaboy
    I have been struggling for too long a time now with a rather simple question about how to create a generic linked list in c++. The list should be able contain several types of structs, but each list will only contain one type of struct. The problem arises when I want to implement the getNode() function [see below], because then I have to specify which of the structs it should return. I have tried to substitute the structs with classes, where the getNode function returns a base class that is inherited by all the other classes, but it still does not do the trick, since the compiler does not allow the getNode function to return anything but the base class then. So here is some code snippet: typedef struct struct1 { int param1; (...) } struct1; typedef struct struct2 { double param1; (...) } struct2; typedef struct node { struct1 data; node* link; } node; class LinkedList { public: node *first; int nbrOfNodes; LinkedList(); void addNode(struct1); struct1 getNode(); bool isEmpty(); }; LinkedList::LinkedList() { first = NULL; nbrOfNodes = 0; } void LinkedList::addNode(struct1 newData) { if (nbrOfNodes == 0) { first = new node; first->data = newData; } else { node *it = first; for (int i = 0; i < nbrOfNodes; i++) { it = it->link; } node *newNode = new node; newNode->data = newData; it->link = newNode; } nbrOfNodes++; } bool LinkedList::isEmpty() { return !nbrOfNodes; } struct1 LinkedList::getNode() { param1 returnData = first->data; node* deleteNode = first; nbrOfNodes--; if (nbrOfNodes) first = deleteNode->link; delete deleteNode; return returnData; } So the question, put in one sentence, is as follows: How do I adjust the above linked list class so that it can also be used for struct2, without having to create a new almost identical list class for struct2 objects? As I said above, each instance of LinkedList will only deal with either struct1 or struct2. Grateful for hints or help

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  • Multiple select statement in stored procedure

    - by GigaPr
    Hi, i have a stored procedure that has to retrieve data from multiple tables something like SELECT [AppointmentId] ,[ContactId] ,[Date] ,[BookedBy] ,[Details] ,[Status] ,[Time] ,[Type] ,[JobId] ,[AppointmentFor] ,(Select PersonFirstName from Person where Person_Id = [AppointmentFor]) As UserFirstName ,(Select PersonLastName from Person where Person_Id = [AppointmentFor]) As UserLastName ,(Select PersonFirstName from Person where Person_Id = [ContactId]) As ContactFirstName ,(Select PersonLastName from Person where Person_Id = [ContactId]) As ContactLastName FROM [dbo].[Appointments] my question is there is any other more efficient way to do this? Or is this the right approach? I am working on a Sql server 2008 Thanks

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  • Removing the transperancy from image while keeping the actual image

    - by KPL
    Hello people, I have three images,and , they are not square or rectangular in shape. They are just like face of anyone. So,basically, my images are in the size 196x196 or anything like that, but complete square or rectangle with the face in the middle and transperant background in the rest of the portion. Now, I want to remove the transperant background too and just keep the faces. Don't know if this is possible and mind you, this isn't a programming question.

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  • Why .NET does not allow cross-thread operations?

    - by RHaguiuda
    This question is not about what is a cross-thread operation, and how to avoid it, but why internal mechanics of .NET framework does not allow a cross-thread operation. I can`t understand why a SerialPort DataReceived event cannot update a simple text box on my form and why using delegates this is possible?

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  • ComboBox in ASP.NET

    - by nCdy
    I can do DropDownList <asp:DropDownList ID="YearList" runat="server" oninit="YearList_Init1" /> but I can't edit text manually there. I can do Text box with Ajax DropDown extender but I can't select-Insert to textbox there. Only display :S Question : how to create DropDownList which I can edit manually ?

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  • PIVOT not performing as expected.

    - by Matt W
    Sorry for an unclear question previously; hopefully I can start again... I have this data: entityid name stringvalue ----------- -------------------- -------------------- 1 ShortDescription Coal 1 LongDescription BlackCoal 1 ShortDescription Gold 1 LongDescription WhiteGold 1 ShortDescription Steel 1 LongDescription StainlessSteel And this query: select * from ( select entityid, name, stringvalue as stringvalue from mytable ) as d pivot ( min([stringvalue]) for [name] in ([ShortDescription],[LongDescription]) ) as p Producing this output: entityid ShortDescription LongDescription -------- ---------------- --------------- 1 Coal BlackCoal Could someone tell me why the other rows are not being produced, please? I was expecting to see: entityid ShortDescription LongDescription -------- ---------------- --------------- 1 Coal BlackCoal 1 Gold WhiteGold 1 Steel StainlessSteel Thanks, Matt

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  • "IntelliTrace debugging not available" error in Visual Studio 2010

    - by Tony_Henrich
    In XP 32bit Visual Studio 2010 I get the error below when I start debugging with IntelliTrace enabled. Doesn't IntelliTrace work in Windows XP or is there some setting which causes this error? UPDATE: The error occurs when I choose the second option to add call information in the IntelliTrace settings. There's nothing in the event log about this error. The question now is how to find out why VS is having trouble adding call information.

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  • .NET Object Dump

    - by Thomas
    Hi all, I have a question about the dump of an objet. 0:000> !do 0x012817b8 Name: blabla.Union2 MethodTable: 009231ac EEClass: 00921548 Size: 16(0x10) bytes Fields: MT Field Offset Type VT Attr Value Name 790fd0f0 4000003 4 System.Object 0 instance 00000000 o 7912d7c0 4000004 8 System.Int32[] 0 instance 00000000 arr What are the significations of : Field, Offset, VT ?

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  • Internet Explorer buggy when accessing a custom weblogic provider

    - by James
    I've created a custom Weblogic Security Authentication Provider on version 10.3 that includes a custom login module to validate users. As part of the provider, I've implemented the ServletAuthenticationFilter and added one filter. The filter acts as a common log on page for all the applications within the domain. When we access any secured URLs by entering them in the address bar, this works fine in IE and Firefox. But when we bookmark the link in IE an odd thing happens. If I click the bookmark, you will see our log on page, then after you've successfully logged into the system the basic auth page will display, even though the user is already authenticated. This never happens in Firefox, only IE. It's also intermittent. 1 time out of 5 IE will correctly redirect and not show the basic auth window. Firefox and Opera will correctly redirect everytime. We've captured the response headers and compared the success and failures, they are identical. final boolean isAuthenticated = authenticateUser(userName, password, req); // Send user on to the original URL if (isAuthenticated) { res.sendRedirect(targetURL); return; } As you can see, once the user is authenticated I do a redirect to the original URL. Is there a step I'm missing? The authenticateUser() method is taken verbatim from an example in Oracle's documents. private boolean authenticateUser(final String userName, final String password, HttpServletRequest request) { boolean results; try { ServletAuthentication.login(new CallbackHandler() { @Override public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException { for (Callback callback : callbacks) { if (callback instanceof NameCallback) { NameCallback nameCallback = (NameCallback) callback; nameCallback.setName(userName); } if (callback instanceof PasswordCallback) { PasswordCallback passwordCallback = (PasswordCallback) callback; passwordCallback.setPassword(password.toCharArray()); } } } }, request); results = true; } catch (LoginException e) { results = false; } return results; I am asking the question here because I don't know if the issue is with the Weblogic config or the code. If this question is more suited to ServerFault please let me know and I will post there. It is odd that it works everytime in Firefox and Opera but not in Internet Explorer. I wish that not using Internet Explorer was an option but it is currently the company standard. Any help or direction would be appreciated. I have tested against IE 6 & 8 and deployed the custom provider on 3 different environments and I can still reproduce the bug.

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  • Is there a way to use the OSX cocoa NSApplication method activateIgnoringOtherApps: to activate an a

    - by Michael Minerva
    This may be a dumb question but it seems like activateIgnoringOtherApps: may be the only way to activate an app using Cocoa. I have a java app that loads up a Cocoa app and I want the Cocoa app to be activated when this happens. The problem is I do not want to have to launch an intermediate app (some sort of controller) and use this app to activateIgnoringOtherApps: my other Cocoa app. Is there some way to use activateIgnoringOtherApps: to force my Cocoa app to become active?

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  • software to manage applications within business.

    - by Richard Friend
    Hi I have been tasked to either find an off the shelf solution or to build inhouse some software that can maintain a list of all of the applications within our business, assign them to the different business areas that use them and list all the servers, documents, knowledge base etc that relate to the app in question. Does anyone know of any existing software that can do this ? Regards

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  • What does "stupid" in "Keep It Simple, Stupid" mean?

    - by Borek
    I'm not a native speaker and always thought that the last "S" in KISS is a "salutation", like calling me that way if I don't keep things simple. But Wikipedia states that KISS stands for "Keep It Simple and Stupid". Which is "correct" or at least makes sense to you? And yes, this is a stupid question :)

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  • Cassandra Production ready on Windows?

    - by BlackTea
    Question anyone know of any success stories of Cassandra running on windows in a production environment? I'm doing some work on Cassandra and trying to find the correct platform for it currently the platform is windows running MS-SQLas the data store. what are the dis-advantages if any when running Cassandra on a windows environment.

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  • Change texture opacity in OpenGL

    - by zoul
    Hello! This is hopefully a simple question: I have an OpenGL texture and would like to be able to change its opacity, how do I do that? The texture already has an alpha channel and blending works fine, but I want to be able to decrease the opacity of the whole texture, to fade it into the background. I have fiddled with glBlendFunc, but with no luck – it seems that I would need something like GL_SRC_ALPHA_MINUS_CONSTANT, which is not available. I am working on iPhone, with OpenGL ES.

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  • Matlab - applying low-pass filter to a vector?

    - by waitinforatrain
    If I have a simple low-pass filter, e.g. filt = fir1(20, 0.2); and a matrix with a list of numbers (a signal), e.g. [0.1, -0.2, 0.3, -0.4] etc, how do I actually apply the filter I've created to this signal? Seems like a simple question but I've been stuck for hours. Do I need to manually calculate it from the filter coefficients?

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  • logging in ad-hoc build

    - by Nava Carmon
    Hi, I have a problem with NSURLConnection in my ad-hoc build I'd like to log the problematic url. In debug version i can just output it to console. The question is how do i track it in ad-hoc? It's not about crashing, so crash logs will not help. Any ideas? TIA

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  • Visual Studio .NET C# executable traces

    - by Chilln
    Hey, i've got a question, is it possible to identify the creator of a .NET assembly, just with traces from VisualStudio within the assembly ? Or can you even get a kind of unique ID of the creator out of it? I don't mean the application information like company or description, they can be edited too easily.

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  • php : is this if condition correct?

    - by phill
    I have the following if condition statement if ( (strlen($data[70])>0) || ( (remove19((trim($data[29])) == '7135556666')) && isLongDistance($data[8])) ) where $data is a recordset from a database. My goal is to include all rows where $data[70] isn't blank, and also include rows where $data[29] = 713555666 && $data[8] isLongDistance = TRUE My question is, if isLongDistance($data[8]) returns false, will it still return the row since $data[70] is not blank? thanks in advance

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  • Muslim Hadeeth Database / CHM to CSV or SQL

    - by atif089
    I am looking here to create a Facebook App on Hadeeth. My first question is for muslim programmers here because other might not be having clue. Is it possible to find hadeeth in csv / sql (at least the popular ones like bukhari, muslim, tirmidhi) otherwise Do we have any tools or is it possible to convert CHM files into CSV or SQL ? This way I can create my own database. Thanks for the help as always :)

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  • How Have You Implemented Open Source Contributions At Your Company?

    - by Travis
    Ok guys, I know others have asked this question in a similar manner in the past, but I want to go beyond the theoretical and find out answers from people who have worked in an environment that relied heavily upon open source technology and never contributed anything back to the open source community, and was able to convince the boss / owner to contribute back to the open source community. I know alot of the standard answers, but I'm looking for some more practical information? What was the key argument, that changed the culture in your company, and how has it changed?

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  • What makes the availability of both primitive and object-wrapped values in JavaScript useful?

    - by Delan Azabani
    I wrote a blog post a while ago detailing how the availability of both primitive and object-wrapped value types in JavaScript (for things such as Number, String and Boolean) causes trouble, including but not limited to type-casting to a boolean (e.g. object-wrapped NaN, "" and false actually type-cast to true). My question is, with all this confusion and problems, is there any benefit to JavaScript having both types of values for the built-in classes?

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  • How to tell Size of a Grid Cell?

    - by beaudetious
    I have a custom control that I've placed inside a cell of a grid. I have some internal calculations I need to run based on the height and width of the custom control. However, I want it to resize based on the size of the cell. So, my main question is... how to I programatically determine the height and width of a given cell?

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