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  • C++ Pointers, objects, etc

    - by Zeee
    It may be a bit confusing, but... Let's say I have a vector type in a class to store objects, something like vector, and I have methods on my class that will later return Operators from this vector. Now if any of my methods receives an Operator, will I have any trouble to insert it directly into the vector? Or should I use the copy constructor to create a new Operator and put this new one on the vector?

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  • What's best practice to check if an object is part of a ManyToMany relationship in Django

    - by PhilGo20
    from an instance of Site with a ManyToMany relationship to Kiosk, i'd like to check if a Kiosk object is part of the relationship. I could do self.apps.get(id=app_id).exists() and check if True or self.apps.get(id=app_id) and catch the ObjectDoesNotExist error or self.apps.filter(id=app_id) and check if True If I have to catch a possible ObjectDoesNotExist error, I may as well use the second one I can do the second but doesnt seem super clean can use the third one but using filter on a unique ID seems wrong to me You can tell me to use whatever works and that'll be a valid answer ;-)

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  • Regex for date.

    - by Harikrishna
    What should be the regex for matching date of any format like 26FEB2009 30 Jul 2009 27 Mar 2008 29/05/2008 27 Aug 2009 What should be the regular expression for that ? Edit I have regex that matches with 26-Feb-2009 and 26 FEB 2009 with but not with 26FEB2009. So if any one know then please update it. (?:^|[^\d\w:])(?'day'\d{1,2})(?:-?st\s+|-?th\s+|-?rd\s+|-?nd\s+|-|\s+)(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*(?:\s*,?\s*|-)(?:'?(?'year'\d{2})|(?'year'\d{4}))(?=$|[^\d\w])

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  • Help finding longest non-repeating path through connected nodes - Python

    - by Jordan Magnuson
    I've been working on this for a couple of days now without success. Basically, I have a bunch of nodes arranged in a 2D matrix. Every node has four neighbors, except for the nodes on the sides and corners of the matrix, which have 3 and 2 neighbors, respectively. Imagine a bunch of square cards laid out side by side in a rectangular area--the project is actually simulating a sort of card/board game. Each node may or may not be connected to the nodes around it. Each node has a function (get_connections()), that returns the nodes immediately around it that it is connected to (so anywhere from 0 to 4 nodes are returned). Each node also has an "index" property, that contains it's position on the board matrix (eg '1, 4' - row 1, col 4). What I am trying to do is find the longest non-repeating path of connected nodes given a particular "start" node. I've uploaded a couple of images that should give a good idea of what I'm trying to do: In both images, the highlighted red cards are supposedly the longest path of connected cards containing the most upper-left card. However, you can see in both images that a couple of cards that should be in the path have been left out (Romania and Maldova in the first image, Greece and Turkey in the second) Here's the recursive function that I am using currently to find the longest path, given a starting node/card: def get_longest_trip(self, board, processed_connections = list(), processed_countries = list()): #Append this country to the processed countries list, #so we don't re-double over it processed_countries.append(self) possible_trips = dict() if self.get_connections(board): for i, card in enumerate(self.get_connections(board)): if card not in processed_countries: processed_connections.append((self, card)) possible_trips[i] = card.get_longest_trip(board, processed_connections, processed_countries) if possible_trips: longest_trip = [] for i, trip in possible_trips.iteritems(): trip_length = len(trip) if trip_length > len(longest_trip): longest_trip = trip longest_trip.append(self) return longest_trip else: print card_list = [] card_list.append(self) return card_list else: #If no connections from start_card, just return the start card #as the longest trip card_list = [] card_list.append(board.start_card) return card_list The problem here has to do with the processed_countries list: if you look at my first screenshot, you can see that what has happened is that when Ukraine came around, it looked at its two possible choices for longest path (Maldova-Romania, or Turkey, Bulgaria), saw that they were both equal, and chose one indiscriminantly. Now when Hungary comes around, it can't attempt to make a path through Romania (where the longest path would actually be), because Romania has been added to the processed_countries list by Ukraine. Any help on this is EXTREMELY appreciated. If you can find me a solution to this, recursive or not, I'd be happy to donate some $$ to you. I've uploaded my full source code (Python 2.6, Pygame 1.9 required) to: http://www.necessarygames.com/junk/planes_trains.zip The relevant code is in src/main.py, which is all set to run.

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  • Entity Framework without Transaction?

    - by Sue
    Is there a way to use EF without transaction? I have very simple single insert and don't want to roll-back when something goes wrong as there may be a trigger logging then raising error from the DB side which I have no control over. I just want to insert then catch any exceptions but don't want to roll-back.

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  • Rails 2 support after Rails 3 has been released

    - by J. Pablo Fernández
    Is there some plan or estimate about how long will Rails 2 be supported after Rails 3 has been released? I wanted to ride the wave and move to Rails 3 right away, specially for projects that may take 4 or 6 months to finish (so that they would probably be released with Rails 3.0.0 final) but I've found many things still not working, many basic plugins and gems; so I believe I'm stuck with Rails 2 for now.

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  • Do fluent interfaces violate the Law of Demeter?

    - by Jakub Šturc
    The wikipedia article about Law of Demeter says: The law can be stated simply as "use only one dot". However a simple example of a fluent interface may look like this: static void Main(string[] args) { new ZRLabs.Yael.Pipeline("cat.jpg") .Rotate(90) .Watermark("Monkey") .RoundCorners(100, Color.Bisque) .Save("test.png"); } So does this goes together?

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  • StyleCop SA1124 DoNotUseRegions is reasonable?

    - by Yanhua
    SA1124 DoNotUseRegions suggest that region should not be used anywhere. Is it really reasonable? I think region is a way to group relative code together and make large class easy to read, for example, if you generate interface method in for class, a region will be automatically inserted by visual studio. I would like to remove this rule while checking code style. May I know your ideal on this rule?

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  • Problems related to showing MessageBox from non-GUI threads

    - by Hans Løken
    I'm working on a heavily data-bound Win.Forms application where I've found some strange behavior. The app has separate I/O threads receiving updates through asynchronous web-requests which it then sends to the main/GUI thread for processing and updating of application-wide data-stores (which in turn may be data-bound to various GUI-elements, etc.). The server at the other end of the web-requests requires periodic requests or the session times out. I've gone through several attempted solutions of dealing with thread-issues etc. and I've observed the following behavior: If I use Control.Invoke for sending updates from I/O-thread(s) to main-thread and this update causes a MessageBox to be shown the main form's message pump stops until the user clicks the ok-button. This also blocks the I/O-thread from continuing eventually leading to timeouts on the server. If I use Control.BeginInvoke for sending updates from I/O-thread(s) to main-thread the main form's message pump does not stop, but if the processing of an update leads to a messagebox being shown, the processing of the rest of that update is halted until the user clicks ok. Since the I/O-threads keep running and the message pump keeps processing messages several BeginInvoke's for updates may be called before the one with the message box is finished. This leads to out-of-sequence updates which is unacceptable. I/O-threads add updates to a blocking queue (very similar to http://stackoverflow.com/questions/530211/creating-a-blocking-queuet-in-net/530228#530228). GUI-thread uses a Forms.Timer that periodically applies all updates in the blocking queue. This solution solves both the problem of blocking I/O threads and sequentiality of updates i.e. next update will be never be started until previous is finished. However, there is a small performance cost as well as introducing a latency in showing updates that is unacceptable in the long run. I would like update-processing in the main-thread to be event-driven rather than polling. So to my question. How should I do this to: avoid blocking the I/O-threads guarantee that updates are finished in-sequence keep the main message pump running while showing a message box as a result of an update.

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  • Stuck in waiting for review

    - by optimisticmonkey
    I created an app in itunesconnect on May 24th but I did't upload the binary until June 1st. The status is still "waiting for review" - in the past the status moved to "in review" fairly quickly. Is it normal to wait several days to move to "in review" - I am worried there was a problem and that I should reject my binary. Thanks for any advice

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  • Know a good IP address Geolocation Service?

    - by carrier
    I'd like to get your impressions on any ip geolocation (as in IP to location) service services you may have employed? I'm looking for something free or cheap, which shouldn't be unrealistic because I need to make a very small volume of requests. Anything with python bindings would be especially ideal.

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  • Cruisecontrol.NET & IIS7 Static File Handler Problem

    - by Mr. Flibble
    I'm trying to get Cruisecontrol.NET running with Server 2008/IIS7 and when I try and navigate to the dashboard I get the following error: HTTP Error 404.17 - Not Found The requested content appears to be script and will not be served by the static file handler. I'm a bit lost in IIS7 so it could be something pretty straightforward. They (cc.net) do some funny stuff with http handlers in the web.config which may be related to the problem: Anyone have any pointers?

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  • Lazy Evaluation in Bash

    - by User1
    Is there more elegant way of doing lazy evaluation than the following: pattern='$x and $y' x=1 y=2 eval "echo $pattern" results: 1 and 2 It works but eval "echo ..." just feels sloppy and may be insecure in some way. Is there a better way to do this in Bash?

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  • RVM can't switch to Ruby 1.9.1

    - by Marco
    I installed Ruby 1.8.7 through apt-get. I then installed 1.9.1 through RVM. The RVM 1.9.1 installation was successful: root: rvm install 1.9.1 <i>Installing Ruby from source to: /usr/local/rvm/rubies/ruby-1.9.1-p378 </i> <i>/usr/local/rvm/src/ruby-1.9.1-p378 has already been extracted. </i> <i>Configuring ruby-1.9.1-p378, this may take a while depending on your cpu(s)... </i> <i>Compiling ruby-1.9.1-p378, this may take a while, depending on your cpu(s)... </i> <i>Installing ruby-1.9.1-p378 </i> <i>Installation of ruby-1.9.1-p378 is complete. </i> <i>Updating rubygems for /usr/local/rvm/gems/ruby-1.9.1-p378@global </i> <i>Updating rubygems for /usr/local/rvm/gems/ruby-1.9.1-p378 </i> <i>adjusting shebangs for ruby-1.9.1-p378 (gem irb erb ri rdoc testrb rake). </i> <i>Installing gems for ruby-1.9.1-p378 (rdoc rake). </i> <i>Installing rdoc to /usr/local/rvm/gems/ruby-1.9.1-p378@global </i> <i>Installing rdoc to /usr/local/rvm/gems/ruby-1.9.1-p378 </i> <i>Installing rake to /usr/local/rvm/gems/ruby-1.9.1-p378@global </i> <i>Installing rake to /usr/local/rvm/gems/ruby-1.9.1-p378 </i> <i>Installation of gems for ruby-1.9.1-p378 is complete. </i> However, I cannot get RVM to switch to the new version: root: ruby -v ruby 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux] root: rvm 1.9.1 root: ruby -v ruby 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux] Despite that, it seems to have installed fine: root: /usr/local/rvm/bin/ruby-1.9.1-p378 -v ruby 1.9.1p378 (2010-01-10 revision 26273) [x86_64-linux] I also tried setting the rvm --default to 1.9.1 but that did not help. Why can't RVM switch to the new version? Should I just set an alias for ruby=1.9.1? *running Debian

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  • Valid URL-string as NSUrl becomes null

    - by Mike
    Hello, another issue where I seem to have found an solution for ObjC but not MonoTouch. I want a NSUrl from an URL (as string). The string may contain whitespace and backslashes. Why is NSUrl returning null for such string, even though these are valid urls in a browser? For example: NSUrl foo = NSUrl.FromString(@"http://google.com/search?\query"); foo == null Any suggestions?

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  • How can I take the first 100 characters of html content ( without stripping the TAGS! )

    - by Atomiton
    There are lots of questions on how to strip html tags, but not many on functions/methods to close them. Here's the situation. I have a 500 character Message summary ( which includes html tags ), but I only want the first 100 characters. Problem is if I truncate the message, it could be in the middle of an html tag... which messes up stuff. Assuming the html is something like this: <div class="bd">"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. <br/> <br/>Some Dates: April 30 - May 2, 2010 <br/> <p>Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. <em>Duis aute irure dolor in reprehenderit</em> in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. <br/> </p> For more information about Lorem Ipsum doemdloe, visit: <br/> <a href="http://www.somesite.com" title="Some Conference">Some text link</a><br/> </div> How would I take the first ~100 characters or so? ( Although, ideally that would be the first approximately 100 characters of "CONTENT" ( in between the html tags ) I'm assuming the best way to do this would be a recursive algorithm that keeps track of the html tags and appends any tags that would be truncated, but that may not be the best approach. My first thoughts are using recursion to count nested tags, and when we reach 100 characters, look for the next "<" and then use recursion to write the closing html tags needed from there. The reason for doing this is to make a short summary of existing articles without requiring the user to go back and provide summaries for all the articles. I want to keep the html formatting, if possible. NOTE: Please ignore that the html isn't totally semantic. This is what I have to deal with from my WYSIWYG. EDIT: I added a potential solution ( that seems to work ) I figure others will run into this problem as well. I'm not sure it's the best... and it's probably not totally robust ( in fact, I know it isn't ), but I'd appreciate any feedback

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  • OpenCalais Parse RDF in .NET

    - by Erika
    is there a way to parse OpenCalais RDF in .NET as i'm using dotnetRDF and it keeps giving me errors. A sample of the Rdf generated may be found in http://viewer.opencalais.com/ , i'm honestly really lost and would really appreciate any help! please help if you use any other apis or know how to make it work with dotnetRDF as i'm honestly really really lost Erika

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  • MS Access 2003 - Unbound Form uses INSERT statement to save to table; what about subforms?

    - by Justin
    So I have an unbound form that I use to save data to a table on button click. Is there a way I can have subforms for entry that will allow me to save data to the table within that same button click? Basically I want to add more entry options for the user, and while I know other ways to do it, I am particularly curious about doing it this way (if it can be done). So lets say the 'parent form' is frmMain. And there are two child forms "sub1" and "sub2". Just for example sake lets say on frmMain there are two text boxes: txtTitle & txtAuthor. sub1 and sub2 both have a text Box on them that represent something like prices. The idea is Title & author of a book, and then a price at each store (simplified). So I tried this (because I thought it was worth a shot): Dim db as DAO.database Dim sql as String sql = "INSERT INTO (Title, Author, PriceA, PriceB) VALUES (" if not isnull(me.txtTitle) then sql = sql & """" & me.txtTitle & """," Else sql = sql & " NULL," End If if not IsNull(me.txtAuthor) then sql = sql & " """ & me.txtAuthor & """," else sql = sql & " NULL," end if if not IsNull (forms!sub1.txtPrice) then sql = sql & " """ & forms!sub1.txtPrice & """," else sql = sql & " NULL," end if without finishing the code, i think you may see the GOTCHA i am headed for. I tried this and got an "Access cannot find the form "" ". I think I can pretty much see why on this approach too, because when I click the button that calls the new sub form into the parent form, the values that were just entered are not held/saved as sub1 closes and sub2 opens. I should mention that the idea above is not intended to be a one or the other approach, rather both sub forms used everytime. so this is an example. i want to use this method (if possible) to have about 7 different sub form choices in one form, and be able to save to a table via a SQL statement. I realize that there may be better ways, but I am just wondering if I can get there with this approach out of curiousity. Thanks as always!

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  • Duplicate content in ASP.NET MVC because of custom routes MapRoute(), are areas the rescue?

    - by artvolk
    I use custom routes for my URLs and my action become accessible via two URLs (not counting trailing slash and lower\upper case letters): one via my custom route /my-custom-route-url/ and one via default /controller/action. I see one possible solution -- put all controllers which use default routing (they are mostly backend) in one area, and place all others in separate area and use it without default route. May be there is a better way?

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