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• how reference copy is handled in Objective-C?

  - by Cathy

  Object graph [Instance A] tree / \ / \ / \ ↓ ↓ [Instance B] [Instance C] apple bug Question Instance A has to reference copies to Instance B and Instance C. If I retain or release Instance A, which has references to the other two instances, what happens to the various reference counts?

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• Switch case in where clause (sql server)

  - by user685565

  I want to use case in sql statement where clause but I have a problem as I want to create a where clause condition on the basis of some value and I want to set a not in clause values on the basis of it here is the query where am facing an issue WHERE CODE = 'x' and ID not in ( case when 'app'='A' then '570','592' when 'Q' then ID 592,90 else 592,90 END but its not syntax

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• C#: Deal with xml, treeview datagridview and datatables

  - by renulren

  Hi all, I am working on a project that pulls data out of an xml files and also uses a tree-grid combination in order to display the data. For example depending on the selected treeview node, the datagridview will display only the records related to that node. What do you think it would be the appropriate approach in dealing with this? Thanks!

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• Rails Plugin Installation Problem

  - by Steve

  When I tried to install the openid plugin, I do not get any confirmation msg about the installation.Even I specify some random .git plugin name, It does not give out any error. Can someone please tell me what about to do to rectify the problem? I used the following syntax ruby script/plugin install git://github.com/rails/open_id_authentication.git

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• Loop over array and set all vars to false or true in javascript

  - by Sixfoot Studio

  Hi All, I need to loop over my array and set all the vars to false or true. I have tried numerous options, none of which are working and it's clearly my lack of javascript syntax knowledge..Please take a look at this: var closeAllCells = [IncomeOpen = "false", RehabOpen = "false", AttendantCareOpen = "false", HomeMaintenanceOpen = "false", DependantCareOpen = "false", IndexationOpen = "false", DeathFuneralOpen = "false", ComprehensiveOpen = "false", CollisionOpen = "false", LiabilityOpen = "false", DCPDOpen = "false"]; So my thinking is that I can just loop over this as follows for (var i=0;i<closeAllCells.length;i++) { closeAllCells[i] = true; // or false if I wished }

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• How can I implement a dispatch table using Perl objects?

  - by bitbucket

  What is the syntax for the hash value for a Perl object member subroutine reference in a dispatch table? use lib Alpha; my $foo = new Alpha::Foo; $foo->bar(); my %disp_table = ( bar => ??? ); I want ??? to be the code reference for $foo->bar().

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• scala implicit or explicit conversion from iterator to iterable

  - by landon9720

  Does Scala provide a built-in class, utility, syntax, or other mechanism for converting (by wrapping) an Iterator with an Iterable? For example, I have an Iterator[Foo] and I need an Iterable[Foo], so currently I am: val foo1: Iterator[Foo] = .... val foo2: Iterable[Foo] = new Iterable[Foo] { def elements = foo1 } This seems ugly and unnecessary. What's a better way?

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• What does the following line of a bash script do?

  - by Bialecki

  Usually work in Windows, but trying to setup RabbitMQ on my Mac. Can someone let me know what the line below does? [ "x" = "x$RABBITMQ_NODE_IP_ADDRESS" ] && [ "x" != "x$NODE_IP_ADDRESS" ] && RABBITMQ_NODE_IP_ADDRESS=${NODE_IP_ADDRESS} Specifically, I'm curious about the [ "x" = "x$RAB..."] syntax.

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• Create select based on routing, how?

  - by huug

  I am trying to implement navigation like in Tree Based Navigation but based on url's defined in routes.rb (named routes, resources, ...). Is it possible to retreive a collection of all routes defined in routes.rb? So I can use it in a select like this: <%= f.collection_select :url, Route.all, :url, :name %> Tnx!

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• incompatible declaration in built in function malloc and incompatible types in assignment error in

  - by mekasperasky

  char char* c[30]; c = (char*) malloc(30*sizeof(char) ); How does this give an incompatible declaration in built in function warning and and incompatible types in assignment error in the line where i have declared malloc . According to the syntax of malloc , i shouldnt have any error

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• How to Verify if file exist with VB script

  - by yael

  ho to verify by VB script syntax if the file conf C:\Program Files\conf exist under Program Files ? for example if it exist then msgBox print file exist if not the msgBox print file not exist THX

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• descending heap sort

  - by user1

  use heap sort to sort this in descending order and show the steps or explanation please below is the tree 79 33 57 8 25 48 below is the array 79 - 33 - 57 - 8 - 25 - 48 ok ascending is easy because the largest element is at the top we can exchange the last element and the first element and then use heapify as the sample code in wikipedia describes it.

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• T-SQL get SELECTed value of stored procedure

  - by David

  In T-SQL, this is allowed: DECLARE @SelectedValue int SELECT @SelectedValue = MyIntField FROM MyTable WHERE MyPrimaryKeyField = 1 So, it's possible to get the value of a SELECT and stuff it in a variable (provided it's scalar, obviously). If I put the same select logic in a stored procedure: CREATE PROCEDURE GetMyInt AS SELECT MyIntField FROM MyTable WHERE MyPrimaryKeyField = 1 Can I get the output of this stored procedure and stuff it in a variable? Something like: DECLARE @SelectedValue int SELECT @SelectedValue = EXEC GetMyInt (I know the syntax above is not allowed because I tried it!)

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• how can i extern a veriable for a namespace in c#?

  - by moon

  i want to declare a global link list for a name space in c# i tried to extern the link list but not know the correct syntax can any one tell me how to extren the variables.

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• Using many mutex locks

  - by hanno

  I have a large tree structure on which several threads are working at the same time. Ideally, I would like to have an individual mutex lock for each cell. I looked at the definition of pthread_mutex_t in bits/pthreadtypes.h and it is fairly short, so the memory usage should not be an issue in my case. However, is there any performance penalty when using many (let's say a few thousand) different pthread_mutex_ts for only 8 threads?

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• MYSQL updating data from other table

  - by atif089

  Hi, I have two tables like of this structure content (content_id, content_type, user_id, time, comment_count) comments (comment_id, content_id, userid, comment, comment_time) What I wold like to do is update the comments_count field with sum of comments i.e COUNT(content_id) from the comments table. I am not able to figure out the right syntax Thanks

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• Getting An Array Result From A C# Method

  - by Soo

  I am trying to write some code to return an array in C#, but don't know the proper syntax. I think my method is set up correctly, but to set an array to the result of the method is what I'm having difficulty with. Method Declaration: double[,] function(double variable) { ... code ... return array }

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• Multiple Regex on String

  - by George

  How can I apply multiple regexs to a single string? For instance, a user inputs the following into a text area: red bird blue cat black dog and I want to replace each carriage return with a comma and each space with an underscore so the final string reads as red_bird,blue_cat,black_dog. I've tried variations in syntax along the lines of the following so far: function formatTextArea() { var textString = document.getElementById('userinput').value; var formatText = textString.replace( new RegExp( "\\n", "g" ),",", new RegExp( "\\s", "g"),"_"); alert(formatText); }

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• How to display complex object in debugger?

  - by 4thSpace

  I'd like to display the contents of the property myarray, from the following singleton: [Session sharedManager].myarray I've tried these: po [Session sharedManager]. myarray po [[Session sharedManager] myarray] but always get this error: A syntax error near end of expression. Any suggestions?

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• Calling function with 1 paremeter @ selector.

  - by Mr. McPepperNuts

  I want to call this guy -(void)addFavorite:(NSString *)favoriteToAdd at, @selector here action:@selector([addFavorite favoriteToAdd:@"string"])]; But I keep getting syntax error no matter which way I write it. Can someone point out the appropriate way to call this function? When it had no parameter and was "addFavorite," it worked fine.

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• How to unimport String "+" operator in Scala?

  - by Alex R

  I'm writing a DSL where the "+" operator is strictly numeric, and the String "+" operator is messing up my implicit conversions. What's the syntax for unimporting an operator of the String class? Thanks

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• If I never ever use HashSet, should I still implement GetHashCode?

  - by Dimitri C.

  I never need to store objects in a hash table. The reason is twofold: coming up with a good hash function is difficult and error prone. an AVL tree is almost always fast enough, and it merely requires a strict order predicate, which is much easier to implement. The Equals() operation on the other hand is a very frequently used function. Therefore I wonder whether it is necessary to implement GetHashCode (which I never need) when implementing the Equals function (which I often need)?

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• Where can I find some good tutorials for C++

  - by Rob

  My friend has convinced me to start learning some C++, so my question is simple: where can I find some good tutorials for it? But please don't link me to the usual dry boring tutorials that only tells you the function syntax, I need more thorough explanations. I get sidetracked very easily, and I need tutorials that are more on a human level, that I'll not only learn from, but enjoy reading as well. So I'd appreciate any links that would help :)

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• Why don't my groovy enums work, or even compile?

  - by ?????

  I'm running Groovy Version: 1.7.0 JVM: 1.6.0_17 (Update -- I just upgraded to 1.7.1 and get the same errors!) I've tried to use enums, using the exact syntax from the groovy documentation, and each time I see the compile error: Groovy:The class java.lang.Enum refers to the class java.lang.Enum and uses 1 parameters, but the referred class takes no parameters Any ideas on what's going on? For example: This code won't compile or run, and gets the error above. enum VehicleStatus { OFF, IDLING, ACCELERATING, DECELARATING } class Vehicle { Long id Long version VehicleStatus status }

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• How to store the hostname in a variable in a .bat file?

  - by eqbridges

  I would like to convert this /bin/sh syntax into a widely compatible Windows batch script: host=`hostname` echo ${host} How to do this so that it'll work on any Windows Vista, Windows XP, and Windows 2000 machine? To clarify: I would then like to go on in the program and use the hostname as stored in the variable host. In other words, the larger goal of the program is not to simply echo the hostname.

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