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• C# 4: how to in-line detect for nulls?

  - by Dr. Zim

  In C# 4, wasn't there a short cut for checking for null values like so: if( myobject?.myproperty?.myotherproperty?.value != null ) The value would return null and not throw an exception. Anyone have a link to how to use it or at least the syntax?

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• Loop through list within a Groovy multi line string

  - by UltraVi01

  I am trying to create a multi line string in Groovy. I have a list of strings that I'd like to loop through within the multi line string. I am not sure what the syntax is for this. Something like below... def html = """\ <ul> <li>$awaiting.each { it.toPermalink()}</li> </ul> """

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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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• 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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• Working with Content Shell on windows 7

  - by JAre

  I can't run Content Shell on my system (Windows 7 x64): When i run --dump-render-tree with the stable release content_shell.exe crashes with message: [XXXX:XXXX:0522/XXXXXX:XXXXXXXXX:FATAL:content_main_runner.cc(735)] Check failed: base::i18n::InitializeICU() were X - some number. And i can't run dev build because it misses mojo_system.dll. Is there any way to fix it? Does it work on Linux or MacOS? If so i probably can run it in VM For the time being.

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• WPF: Problem with TreeView databinding

  - by Am

  Hi, I have a tree view defined as follows: <TreeView Grid.Row="0" Grid.Column="0" Margin="0" FlowDirection="LeftToRight" ItemTemplate="{StaticResource NavigationHeaderTemplate}" Name="TreeView2"> </TreeView> The data binding is: public class ViewTag : INotifyPropertyChanged { private string _tagName; public string TagName { get { return _tagName; } set { _tagName = value; PropertyChanged(this, new PropertyChangedEventArgs("Tag Name")); } } private ObservableCollection<ViewTag> _childTags; public ObservableCollection<ViewTag> ChildTags { get { return _childTags; } set { _childTags = value; OnPropertyChanged(new PropertyChangedEventArgs("Child Tags")); } } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(PropertyChangedEventArgs e) { if (PropertyChanged != null) PropertyChanged(this, e); } #endregion public ViewTag(string tagName, ObservableCollection<ViewTag> childTags) { _tagName = tagName; _childTags = childTags; } } And my test binding is: List<ViewTag> tempTags = new List<ViewTag>(); ViewTag t1, t2, t3, t4, t5, t6; t1 = new ViewTag("Computers", null); t2 = new ViewTag("Chemistry", null); t3 = new ViewTag("Physics", null); var t123 = new ObservableCollection<ViewTag>(); t123.Add(t1); t123.Add(t2); t123.Add(t3); t4 = new ViewTag("Science", t123); var t1234 = new ObservableCollection<ViewTag>(); t1234.Add(t4); t5 = new ViewTag("All Items", t1234); t6 = new ViewTag("Untagged", null); var tall = new ObservableCollection<ViewTag>(); tall.Add(t5); tall.Add(t6); xy.Add(new ViewNavigationTree() { Header = "Tags", Image = "img/tags2.ico", Children = tall }); var rootFolders = eDataAccessLayer.RepositoryFacrory.Instance.MonitoredDirectoriesRepository.Directories.ToList(); var viewFolders = new ObservableCollection<ViewTag>(); foreach (var vf in rootFolders) { viewFolders.Add(new ViewTag(vf.FullPath, null)); } xy.Add(new ViewNavigationTree() { Header = "Folders", Image = "img/folder_16x16.png", Children = viewFolders }); xy.Add(new ViewNavigationTree() { Header = "Authors", Image = "img/user_16x16.png", Children = null }); xy.Add(new ViewNavigationTree() { Header = "Publishers", Image = "img/powerplant_32.png", Children = null }); TreeView2.ItemsSource = xy; Problem is, the tree only shows: + Tags All Items Untagged + Folders dir 1 dir 2 ... Authors Publishers The items I added under "All Items" aren't displayed. Being a WPF nub, i can't put my finger on the problem. Any help will be greatly appriciated.

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• Hash Table v/s STL map in C++

  - by anon

  Hi, I am trying to learn C++ maps. Was just wondering about the implementation of STL map. I read it employs Binary search tree. Is there a implementation of hash table in STL? How exactly do STL map stores Key Value pairs?

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• Javascript object list sorting by object property

  - by Constructor

  I need to do this: (sorry not in javascript syntax-still learning object language :) ) object=car attibutes:top-speed, brand.... now I want to sort the list of those cars in order by top-speed, brand... How do I do this (please note the solution must be javascript only, no php or other stuff) ?

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• how do I interpret rpart splits on factor variables when building classification trees in R?

  - by artessa

  ie, if the factor variable is Climate, with 4 possible values: Tropical, Arid, Temperate, Snow, and a node in my rpart tree is labeled as "Climate:ab", what is the split?

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• Interrogating Java source code

  - by VibeofBoston

  I have a Java source code that I need to interrogate and apply security policies [for e.g. applying CWE] I have couple of ideas, for starters using AST and then travel thru the tree. Others include using regular expression. Are there any options other than AST or regex that I could use for such process.

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• Good JavaScript IDE with JQuery support ?

  - by Pop Catalin

  I'm planing to start learning JQuery (among other things), so I'm looking for a good Javascript editor that can preferably provide some of the following features: Syntax coloring Contextual help for standard JS functions, JQuery functions and possibly custom ones. Some code completion. (optional) JS debugging Is there such and editor out here? or any that come close to this?

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• What does this mean?

  - by LeonixSolutions

  I found this in some code examples while googling : $sql = 'INSERT INTO users (username,passwordHash) VALUES (?,?)'; it's new to me, but I would guess that it a substitution method and equivalent to $sql = "INSERT INTO users (username,passwordHash) VALUES ($username,$passwordHash)";` or $sql = 'INSERT INTO users (username,passwordHash) VALUES (' . $username . ',' . $passwordHash . ')';` would that be correct? Is it an actual PHP syntax, or was he just trying to simplify his example?

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• Cryptic C++ "thing" (function pointer)

  - by m00st

  What is this syntax for in C++? Can someone point me to the technical term so I can see if I find anything in my text? At first I thought it was a prototype but then the = and (*fn) threw me off... Here is my example: void (*fn) (int&,int&) = x;

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• How do I get Aptana to recognize .jspf files?

  - by Keith Bentrup

  How do I get Aptana to recognize .jspf files? I'd like to have syntax highlighting for .jspf files. I'm sure there's a preference/config option or an xml file to edit, but I'm not finding it. I assume it's similar to the eclipse process, so I'm tagging eclipse, too. If it's not, I'll remove the tag.

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• Drawing Directed Acyclic Graphs: Using DAG property to improve layout/edge routing?

  - by Robert Fraser

  Hi, Laying out the verticies in a DAG in a tree form (i.e. verticies with no in-edges on top, verticies dependent only on those on the next level, etc.) is rather simple. However, is there a simple algorithm to do this that minimizes edge crossing? (For some graphs, it may be impossible to completely eliminate edge crossing.) A picture says a thousand words, so is there an algorithm that would suggest: instead of:

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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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• Semantic #region usage

  - by Luca

  What's your opinion about using #region folding using application semantic, instead of folding for "syntax". For example: #region Application Loop #region User Management #region This Kinf of stuffs instead of #region Private Routines #region Public Properties #region ThisRoutine // (Yes, I've seen this also!) In this logic, I'm starting fold even routine bodies. I'm starting to love #region directive (even using #pragma region when using C++!).

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• Running VB & C# programs in Ubuntu

  - by Arjun Vasudevan

  I've run the following command in the Ubuntu terminal - sudo apt-get install mono-develop Now how can I run *.vb and *.cs programs using the terminal - What is the command that need to be given? Does the syntax vary when we write code in Windows & Linux environment?

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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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• Why cast null before checking if object is equal to null?

  - by jacerhea

  I was looking through the "Domain Oriented N-Layered .NET 4.0 Sample App" project and ran across some code that I do not understand. In this project they often use syntax like the following to check arguments for null: public GenericRepository(IQueryableContext context,ITraceManager traceManager) { if (context == (IQueryableContext)null) throw new ArgumentNullException("context", Resources.Messages.exception_ContainerCannotBeNull); Why would you cast null to the type of the object you are checking for null?

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• In emacs, way to change the background color of side panes (Package Explorer, Task List, Outline, et

  - by Aaron F.

  I know how to change the syntax highlighting color rules for the Text Editor pane. Any way to do the same for other panes?

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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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• Is size_t only in C++ standard or C standard as well?

  - by Crazy Chenz

  Is size_t only in C++ standard or C standard as well? I cannot find a C header in the "/usr/include" tree that defines size_t. If it is not in the C std, is GCC just doing some magic to make things work? Thanks, Chenz

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• Can I lock tables in an IF statement in MySQL?

  - by MalcomTucker

  This is throwing a syntax error - --from body of a stored proc IF (name = in_name) SET out_id = temp; ELSE LOCK TABLE People WRITE; INSERT INTO People (Name) VALUES (in_name); UNLOCK TABLE; SELECT LAST_INSERT_ID() INTO out_id END IF do I have to lock any tables I need at the start of the SP?

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• Query having 2 Where Clause

  - by Harsha M V

  i am trying to login and want to validate username and password against the records in the database. I am not sure how to pass two Where clause public Boolean login(String username, String password) throws SQLException { Cursor mCursor = db.query(TABLE_USERS, new String[] { ID, KEY_NAME, KEY_USERNAME}, KEY_USERNAME + "=" + "'"+username+"'", KEY_PASSWORD + "=" + "'"+password+"'", null, null, null, null, null); if (mCursor.moveToFirst()) { return true; } return false; } Am getting a Syntax Error.

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