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• HashSet versus Dictionary<T, K> w.r.t searching time to find if an item exists

  - by halivingston

  HashSet<T> t = new HashSet<T>(); // add 10 million items Dictionary<T, K> t = new Dictionary<T, K>(); // add 10 million items. Whose .Contains method will return quicker? Just to clarify, my requirement is I have 10 million objects (well, strings really) that I need to check if they exist in the Data Structure. I will NEVER iterate.

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• Explicit initialization of struct/class members

  - by Zephon

  struct some_struct{ int a; }; some_struct n = {}; n.a will be 0 after this; I know this braces form of initialization is inherited from C and is supported for compatibility with C programs, but this only compiles with C++, not with the C compiler. I'm using Visual C++ 2005. In C this type of initialization struct some_struct n = {0}; is correct and will zero-initialize all members of a structure. Is the empty pair of braces form of initialization standard? I first saw this form of initialization in a WinAPI tutorial from msdn.

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• Cleanest/One-liner way to require all files in directory in Ruby?

  - by viatropos

  When creating gems, I often have a directory structure like this: |--lib |-- helpers.rb `-- helpers |-- helper_a.rb `-- helper_b.rb Inside the helpers.rb, I'm just require-ing the files in the helpers directory. But I have to do things like this: $:.push(File.dirname(__FILE__) + '/helpers') require 'helper_a' require 'helper_b' Is there a way to make that one line so I never have to add to it? I just came up with this real quick: dir = File.join(File.dirname(__FILE__), "helpers") Dir.entries(dir)[2..-1].each { |file| require "#{dir}/#{file[0..-4]}" } But it's two lines and ugly. What's a slick one liner to solve this problem?

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• Import de-normalized relational data from Excel into SQL Server

  - by roryf

  I need to import data from an Excel spreadsheet into SQL Server, but the data isn't in a relational/normalized format so the import wizard isn't going to cut it (as far as I know). The data is in this format: Category SubCategory Name Description Category#1 SubCategory#1 Product#1 Description#1 Category#1 SubCategory#1 Product#2 Description#2 Category#1 SubCategory#2 Product#3 Description#3 Category#1 SubCategory#2 Product#4 Description#4 Category#2 SubCategory#3 Product#5 Description#5 (apologies I'm lacking the inventiveness to come up with 'real' data at this time in the morning...) Each row contains a unique product, but the cateogry structure is duplicated. I want to import this data into three tables: Category SubCategory Product (I know SubCategory should really be contained within Category, DB was not my design) I need a way to import unique rows based on the Category and then SubCategory columns, and then when importing the other columns into Product, obtain a reference to the SubCategory based on name. Short of scripting this, is there any way to do it using the import wizard or some other tool?

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• Processing an n-ary ANTLR AST one child at a time

  - by Chris Lieb

  I currently have a compiler that uses an AST where all children of a code block are on the same level (ie, block.children == {stm1, stm2, stm3, etc...}). I am trying to do liveness analysis on this tree, which means that I need to take the value returned from the processing of stm1 and then pass it to stm2, then take the value returned by stm2 and pass it to stm3, and so on. I do not see a way of executing the child rules in this fashion when the AST is structured this way. Is there a way to allow me to chain the execution of the child grammar items with my given AST, or am I going to have to go through the painful process of refactoring the parser to generate a nested structure and updating the rest of the compiler to work with the new AST? Example ANTLR grammar fragment: block : ^(BLOCK statement*) ; statement : // stuff ; What I hope I don't have to go to: block : ^(BLOCK statementList) ; statementList : ^(StmLst statement statement+) | ^(StmLst statement) ; statement : // stuff ;

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• How is it possible the class inheritance in namespaces using Ruby on Rails 3?

  - by user502052

  In my RoR3 application I have a namespace called NS1 so that I have this filesystem structure: ROOT_RAILS/controllers/ ROOT_RAILS/controllers/application_controller.rb ROOT_RAILS/controllers/ns/ ROOT_RAILS/controllers/ns/ns_controller.rb ROOT_RAILS/controllers/ns/names_controller.rb ROOT_RAILS/controllers/ns/surnames_controller.rb I wuold like that 'ns_controller.rb' inherits from application controller, so in 'ns_controller.rb' file I have: class Ns::NsController < ApplicationController ... end Is this the right approach? Anyway if I have this situation... in 'application_controller.rb' class ApplicationController < ActionController::Base @profile = Profile.find(1) end in 'ns_controller.rb' class Ns::NsController < ApplicationController @name = @profile.name @surname = @profile.surname end ... '@name' and '@surname' variables are not set. Why?

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• Storing SQL queries in Table in sql server

  - by Rohit

  We have multiple jobs in our system.These jobs are listed in a grid. We have 3 different user types (usertypeid 1,2,3). For each user listing is different and he can filter listing by selecting view from a dropdown. ViewName in the below table is the view which needs to be displayed. To achieve this functionality, a fellow developer has created the following table structure and stored sql fragments in SQLExpression in the below table. According to me the query should not be stored in database. What are the pros and cons of this approach and what are the available alternatives? JobListingViewID ViewName SQLExpression UserTypeID 3 All Jobs 1 = 1 3 4 Error Jobs JobStatusID IN ( 2 ) 1 5 Error Jobs JobStatusID IN ( 2 ) 2 6 Error Jobs JobStatusID IN ( 2 ) 3 7 Speech JobStatusID IN ( 1, 3, 8 ) 1

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• Retrieve Storage and Programs Memory on .NET Compact Framework 2 and WM5

  - by wintermute

  Hi! I've been looking for quite a while already and still couldn't find a solution for this. All I need is to retrieve the memory levels and percentage of use. OpenNETCF has a MemoryManagement class, which seems to encapsulates a data structure returned through a P/Invoke or something like that, and it gives me the TotalPhysicalMemory, TotalVirtualMemory, AvailablePhisicalMemory and such, but those do not directly relate to Storage and Programs, nor could I find a way to "convert" these attributes to those I need. Has anyone there already done this? It must be easy, I just need the very same values available on Settings System Memory. Thanks in advance! edit: I'm already being able to retrieve Available and total Storage memory through the GetDiskFreeSpaceEx P/Invoke. Since Storage and Programs memory seem to rely into the same hardware, maybe it's just a case of finding out what path to pass as the method's first parameter.

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• SQL select all items of an owner from an item-to-owner table

  - by kdobrev

  I have a table bike_to_owner. I would like to select current items owned by a specific user. Table structure is CREATE TABLE IF NOT EXISTS `bike_to_owner` ( `bike_id` int(10) unsigned NOT NULL, `user_id` int(10) unsigned NOT NULL, `last_change_date` date NOT NULL, PRIMARY KEY (`bike_id`,`user_id`,`last_change_date`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; In the profile page of the user I would like to display all his/her current possessions. I wrote this statement: SELECT `bike_id`,`user_id`,max(last_change_date) FROM `bike_to_owner` WHERE `user_id` = 3 group by `last_change_date` but i'm not quite sure it works correctly in all cases. Can you please verify this is correct and if not suggest me something better. Using php/mysql. Thanks in advance!

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• How can I save a directory tree to an array in PHP?

  - by Greg

  I'm trying to take a directory with the structure: top folder1 file1 folder2 file1 file2 And save it into an array like: array ( 'folder1' => array('file1'), 'folder2' => array('file1', 'file2') ) This way, I can easily resuse the tree throughout my site. I've been playing around with this code but it's still not doing what I want: private function get_tree() { $uploads = __RELPATH__ . DS . 'public' . DS . 'uploads'; $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($uploads), RecursiveIteratorIterator::SELF_FIRST); $output = array(); foreach($iterator as $file) { $relativePath = str_replace($uploads . DS, '', $file); if ($file->isDir()) { if (!in_array($relativePath, $output)) $output[$relativePath] = array(); } } return $output; }

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• Is it possible to link directories in git?

  - by Andreas Selenwall

  I will start with a simplified example describing my intent. I have a repository my-rep.git containing two directories, src and deploy. In src I have my source code (NodeJS code, but that doesn't matter), and in deploy I want to keep my deploy configuration. So for example if I have a project, projectA, then the structure should look like this, my-rep.git/src/projectA my-rep.git/deploy/projectA/dotcloud.yml my-rep.git/deploy/projectA/src Now to my question. I want the source code in projectA to be available in the deploy directory for dotcloud. Is there any way I can make my-rep.git/deploy/projectA/src point to my-rep.git/src/projectA, that is, so when I do a git pull in deploy it will automatically pull the my-rep.git/deploy/projectA/src. It must be supported in git, symbolic linux links won't work as some developers in my team work in Windows.

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• multi-dimensional ArrayList

  - by wishi

  Hi! Just a very small question... I seem to run into too much complexity here: I have to realize an index-structure like {42, someString}. I tried: Object entry[][] = new Object[1][1]; ArrayList<Object> my_list = new ArrayList<Object>(); However that looks really strange. Isn't there a better much simpler solution to just store some Integer and a String? I need to perfrom search for the Strings and return the Integer... so I thought Collections and ArrayLists are good friends in the Java API.

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• wxWidgets - Add items to sizer via DLL

  - by intl

  I have a GUI set up with wxWidgets (C++, MSVC) and part of the functionality is to add elements to the GUI via DLL's. Essentially, I would be passing in a sizer to the DLL which will in turn add the elements based on what is in the DLL. Could someone just point me in the right direction on how to get the DLL set up? I have looked, but don't see anything that's similar to what I'm looking for. The programming of the elements is fine with me, I just need to understand how to structure the DLL programming. Help appreciated.

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• design pattern tools to use?

  - by ajsie

  i have noticed that every area has some tools you can use to make things easier. eg. css = dreamweaver doctrine/propel = orm designer // you dont have to hardcore code schemas manually and remembering all the syntax/variables mysql = mysql workbench // the same etc. in this way you get aided and dont have to type things the hard way, and can learn the structure, but then use GUI tools to help you develop faster. now i'm learning design patterns (singleton, factory, command, memento etc) and im wondering if there are some kind of tools you can use that will help you develop faster. i dont know exactly what tools i'm trying to find, just helping me when coding with design patterns (schema drawings? references?) are there any?

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• How might one implement FileTimeToSystemTime?

  - by Billy ONeal

  Hello :) I'm writing a simple wrapper around the Win32 FILETIME structure. boost::datetime has most of what I want, except I need whatever date type I end up using to interpolate with Windows APIs without issues. To that end, I've decided to write my own things for doing this -- most of the operations aren't all that complicated. I'm implementing the TimeSpan - like type at this point, but I'm unsure how I'd implement FileTimeToSystemTime. I could just use the system's built-in FileTimeToSystemTime function, except FileTimeToSystemTime cannot handle negative dates -- I need to be able to represent something like "-12 seconds". How should something like this be implemented? Billy3

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• Access 2007 - Forms created on the fly

  - by glinch

  Hi There, Hopefully I can find some words of advice from somebody. Is it possible to create forms 'on-the fly' so to speak in MS-Access 2007 I have a structure of tables: tblCustomer tblQuestAns A customer may answer the questionnaire answers many times as they relate to all products. I propose to hopefully have an initial input form that will ask how many products of which there could be more than 1 eg: TV, Video (say the user selects 2) On entering that data the next form should hopefully update itself to include the list of questions eg TV Q1, Q2 Q3 - Video (1) Q1, Q2 Q3 - Video (2) Q1, Q2 Q3 Is that possible? Any point in the right direction would be appreciated. Thanks Noel

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• Making archive from files with same names in different directories

  - by Tim

  Hi, I have some files with same names but under different directories. For example, path1/filea, path1/fileb, path2/filea, path2/fileb,.... What is the best way to make the files into an archive? Under these directories, there are other files that I don't want to make into the archive. Off the top of my head, I think of using Bash, probably ar, tar and other commands, but am not sure how exactly to do it. Renaming the files seems to make the file names a little complicated. I tend to keep the directory structure inside the archive. Or I might be wrong. Other ideas are welcome! Thanks and regards!

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• Multiple formsauthentifications in the same application

  - by citronas

  Hi there, I was wondering if it is possible to use two different formsauthentification logins with the following directory structure: /default.aspx /login.aspx /web.config /subdirectory/sublogin.aspx /subdirectory/subdefault.aspx /subdirectory/web.config The web.config in the root contains the following settings: <authentication mode="Forms"> <forms protection="All" slidingExpiration="true" loginUrl="~/login.aspx" path="/"/> </authentication> <authorization> <deny users="?"/> </authorization> What I want to achieve is, that all directories except 'subdirectory' are protected by the login.aspx in the root. 'subdirectory' has its own login.aspx (sublogin.aspx) How would the correct content of the web.config in subdirectory look like?

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• How to use Zend_Controller_Action_HelperBroker::addPath to add helpers

  - by manyxcxi

  I'm just starting out with Zend Framework and am having issues using the addPath to add helpers. I'm not sure if my classes are named incorrectly, I'm giving it the wrong prefix, or what I'm doing wrong so I will post the code and file structure and get out of the way. In Bootstrap.php public function __construct($application) { ... // This works with a manual include_once('../application/plugins/helpers/Csrf.php'); //Zend_Controller_Action_HelperBroker::addHelper(new Application_Controller_Action_Helper_Csrf()); // This isn't picking up my helper class automagically Zend_Controller_Action_HelperBroker::addPath('../application/plugins/helpers','Application_Controller_Action_Helper'); ... } In application/plugins/helpers/Csrf.php class Application_Controller_Action_Helper_Csrf extends Zend_Controller_Action_Helper_Abstract { ... } My directory tree / application/ ... plugins/ helpers/ Csrf.php CsrfProtect.php ...

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• What are the ways to create draw data structures for latex?

  - by alicephacker

  I tried tikz/pgf a bit but have not had much luck creating a nice diagram to visualize bitfields or byte fields of packed data structures (i.e. in memory). Essentially I want a set of rectangles representing ranges of bits with labels inside, and offsets along the top. There should be multiple rows for each word of the data structure. This is similar to most of the diagrams in most processor manuals labeling opcode encoding etc. Has anyone else tried to do this using latex or is there a package for this?

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• RSS-Feed or XML-Stream?

  - by Maenny

  HI Folks, I am programming a website for online-reservation-management, preferably for holiday homes. I want to implement a service, which allows the user to pass all their occupation dates to other websites. My question is, what would be the most professional way to do this? Generate a XML-stream Create a valid RSS Feed I think that a XML file has the advantages of being straight to the point, without any information that noone needs. Webmasters of other websites surely prefer the structure of a simple XML file. On the other hand, when someone without programming knowledge wants to use the RSS-Feed with a feedreader or simply with the browser, it may be user-friendlier to use a RSS-FEED. What so you think, I'm unsure...? Greetz Maenny

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• Best way for saving infinit playlists (arrays) into db? (php mySql)

  - by Ole Jak

  So client gives me a string like "1,23,23,abc,ggg,544,tf4," from user 12 . There can be infinit number of elements with no spaces just value,value,... structure. I have users table (with users uId(key), names etc). I have streams table with ( sId(key), externalID, etc values). User sends me externalId's. And I need to hawe externalId's in play list (not my sId's). I need some way to store such array into my DB and be able to get it from DB. I need to be able to do 2 things return such string back to user be able to get na array from it like {1; 23; 23; abc; ggg; 544; tf4;} So what is best method (best here means shourt(small amount of) code) to store such data into db to retrivew stored tata in bouth ways shown

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• How to initialize an array of structures within a function?

  - by drtwox

  In the make_quad() function below, how do I set the default values for the vertex_color array in the quad_t structure? /* RGBA color */ typedef { uint8_t r,g,b,a; } rgba_t; /* Quad polygon - other members removed */ typedef { rgba_t vertex_color[ 4 ] } quad_t; Elsewhere, a function to make and init a quad: quad_t *make_quad() { quad_t *quad = malloc( sizeof( quad_t ) ); quad->vertex_color = ??? /* What goes here? */ return ( quad ); } Obviously I can do it like this: quad->vertex_color[ 0 ] = { 0xFF, 0xFF, 0xFF, 0xFF }; ... quad->vertex_color[ 3 ] = { 0xFF, 0xFF, 0xFF, 0xFF }; but this: quad->vertex_color = { { 0xFF, 0xFF, 0xFF, 0xFF }, { 0xFF, 0xFF, 0xFF, 0xFF }, { 0xFF, 0xFF, 0xFF, 0xFF }, { 0xFF, 0xFF, 0xFF, 0xFF } }; ...results in "error: expected expression before '{' token".

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• Which workflow engine should I chose for implementing a dynamic reconfiguration of workflows?

  - by Raya

  I want to be able to interrupt a running workflow instance, say when a new activity is about to be invoked, and extract information both about the structure of the workflow and the data in the particular instance. Then I will consult with an external system and according to its response I will possibly alter the behaviour of the workflow. The options I would like to have are addition/removal of activities and altering parameters for the activities to be invoked. I am currently struggling with the engine it's best to go with. I have looked at WWF, Apache ODE, Oracle Workflow and Active BPEL and as far as I understand they can all provide me with the options I need. I would really appreciate any recommendations on which one will be the easiest to work with for my purpose and any restrictions either of the above might have that would prevent me from reaching my goal. Thanks

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• Problem doing SVN Vendor Branch - merge

  - by Gyan

  Hi, I am trying to use the svn vendor branch to upgrade the third party library. (We have modified the source code) I followed all the steps to create the vendor branch:: created the vendor branch for old version (3rd party library) created the vendor branch for latest version (3rd party library) copied the latest version to current folder using (usign svn_load_dirs.pl script) structure of vendor repository in svn URL/vendor/library/3.5.0 URL/vendor/library/3.7.0 URL/vendor/library/current I have the library-3.5.0 used/modified at URL/trunk/library/customized-library I have a problem when I try to merge the difference between URL/vendor/library/3.7.0 and URL/vendor/library/3.5.0 to URL/trunk/library/customized-library I am at the folder where URL/trunk/library/customized-library is checked out and I use following command to do the merge svn merge URL/vendor/library/3.5.0 URL/vendor/library/current . --accept PARAMETERS when I use theirs-conflict for accept parameter, It ignores all of my changes to the old version and copies files from 3.7.0 when I user mine-conflict, it ignores the files in 3.7.0 when I use postpone, it throws exception "tree conflict" Thanks Gyan

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