Search Results

Search found 16643 results on 666 pages for 'stackoverflow answer'.

Page 544/666 | < Previous Page | 540 541 542 543 544 545 546 547 548 549 550 551  | Next Page >

• Hidden features of Perl?

  - by Adam Bellaire

  What are some really useful but esoteric language features in Perl that you've actually been able to employ to do useful work? Guidelines: Try to limit answers to the Perl core and not CPAN Please give an example and a short description Hidden Features also found in other languages' Hidden Features: (These are all from Corion's answer) C# Duff's Device Portability and Standardness Quotes for whitespace delimited lists and strings Aliasable namespaces Java Static Initalizers JavaScript Functions are First Class citizens Block scope and closure Calling methods and accessors indirectly through a variable Ruby Defining methods through code PHP Pervasive online documentation Magic methods Symbolic references Python One line value swapping Ability to replace even core functions with your own functionality Other Hidden Features: Operators: The bool quasi-operator The flip-flop operator Also used for list construction The ++ and unary - operators work on strings The repetition operator The spaceship operator The || operator (and // operator) to select from a set of choices The diamond operator Special cases of the m// operator The tilde-tilde "operator" Quoting constructs: The qw operator Letters can be used as quote delimiters in q{}-like constructs Quoting mechanisms Syntax and Names: There can be a space after a sigil You can give subs numeric names with symbolic references Legal trailing commas Grouped Integer Literals hash slices Populating keys of a hash from an array Modules, Pragmas, and command-line options: use strict and use warnings Taint checking Esoteric use of -n and -p CPAN overload::constant IO::Handle module Safe compartments Attributes Variables: Autovivification The $[ variable tie Dynamic Scoping Variable swapping with a single statement Loops and flow control: Magic goto for on a single variable continue clause Desperation mode Regular expressions: The \G anchor (?{}) and '(??{})` in regexes Other features: The debugger Special code blocks such as BEGIN, CHECK, and END The DATA block New Block Operations Source Filters Signal Hooks map (twice) Wrapping built-in functions The eof function The dbmopen function Turning warnings into errors Other tricks, and meta-answers: cat files, decompressing gzips if needed Perl Tips See Also: Hidden features of C Hidden features of C# Hidden features of C++ Hidden features of Java Hidden features of JavaScript Hidden features of Ruby Hidden features of PHP Hidden features of Python

  Read the article

• UI design in flash games

  - by anon

  This question is more UI/Design-ish than hard-core programming is. Background: I've been coding in VIM/C++/OpenGL for a long time. I've come to realize that this (VIM/C++/OpenGL) isn't the way to learn about programming fancy/cool-looking/futuristic UIs; and that the design of such UIs belongs more so in the artistic/designer world of Flash. Anyway, I currently have a machine with MacOSX. What software should I install? What book should I read to learn about the artistic/design side of these futuristic UIs? [It's okay if the tools to design them are mouse clicking + graphical rather than coding based]. Question: what software packages + books to read to learn about creating fancy-looking / futuristic UIs in flash? Thanks! EDIT: PS these questions seem to get closed frequently. If you're going to vote to close for "duplicate question"; atleast provide a link to the question (with an answer).

  Read the article

• Updating CoreData xcdatamodel file troubles - attribute type change

  - by San

  I noticed several questions related to this topic go unanswered. Is this such a gray area that nobody really understands it? Here is my problem: I am a midway in the development of my app and the app has never been used ouside of my iphone simulator.One of the attributes in my core data structure requires a type change.Since my app has never been used outside of my iPhone Simulator, I first deleted the sqlite file. Doubling the effort of this step, I also went into iPhone Simulator menu and selected "Reset Content and Settings...". Than, I edited the xcdatamodel file and changed the type of my attribute. I saved the file and exited. Without any other changes, I compiled. I expected it to fail because of my type change. It did not! After this, I assigned a value with new type to my attribute and it fails to compile?! Is there something else that I need to do for the change to take an effect? I would really, really appreciate an answer to my question. Thank you!

  Read the article

• Mocking WebResponse's from a WebRequest

  - by Rob Cooper

  I have finally started messing around with creating some apps that work with RESTful web interfaces, however, I am concerned that I am hammering their servers every time I hit F5 to run a series of tests.. Basically, I need to get a series of web responses so I can test I am parsing the varying responses correctly, rather than hit their servers every time, I thought I could do this once, save the XML and then work locally. However, I don't see how I can "mock" a WebResponse, since (AFAIK) they can only be instantiated by WebRequest.GetResponse How do you guys go about mocking this sort of thing? Do you? I just really don't like the fact I am hammering their servers :S I dont want to change the code too much, but I expect there is a elegant way of doing this.. Update Following Accept Will's answer was the slap in the face I needed, I knew I was missing a fundamental point! Create an Interface that will return a proxy object which represents the XML. Implement the interface twice, on that uses WebRequest, the other that returns static "responses". The interface implmentation then either instantiates the return type based on the response, or the static XML. You can then pass the required class when testing or at production to the service layer. Once I have the code knocked up, I'll paste some samples. Thanks Will :)

  Read the article

• basic javascript question on geolocation and googlemaps

  - by ade

  hello all, Im hoping that somebody can help me out on what i feel is an easy answer but I just cant get it to work out. Im trying to trap the geolocation lat and long and place it into the google maps api so far i have var myOptions = { zoom:7, trips:1, mapTypeId: google.maps.MapTypeId.ROADMAP } var map = new google.maps.Map(document.getElementById("map"), myOptions); directionsDisplay.setMap(map); var request = { origin: 'newyork' destination: 'deleware', travelMode: google.maps.DirectionsTravelMode.DRIVING }; this works fine for what i want. how ever I want to be able to change Origin to the users lat long using the following script from google.maps.api. their code is: if(navigator.geolocation) { navigator.geolocation.getCurrentPosition(function(position) { initialLocation = new google.maps.LatLng(position.coords.latitude,position.coords.longitude); var placeMarker = new google.maps.Marker({ position: initialLocation, map: map, }); map.setCenter(initialLocation); }, function() { handleNoGeolocation(browserSupportFlag); }); } else { // Browser doesn't support Geolocation handleNoGeolocation(); } function handleNoGeolocation() { initialLocation = newyork; map.setCenter(initialLocation); } I want to pull out the navigator.geolocation.getCurrentPosition(function(position) { initialLocation = new google.maps.LatLng(position.coords.latitude,position.coords.longitude); and allocate it two 2 varibles, myLat and myLong. I then want to be able to change my orignal script from var request = { origin: 'newyork' destination: 'deleware', travelMode: google.maps.DirectionsTravelMode.DRIVING }; to var request = { origin: myLat,myLong destination: 'deleware', travelMode: google.maps.DirectionsTravelMode.DRIVING }; Does this make sense..? Im currently having a pig with it and as im not a JS developer its what i think should be a simple bit of coding that im losing the battle with.. any thoughts..?

  Read the article

• Questions regarding ordering of catch statements in catch block - compiler specific or language stan

  - by Andy

  I am currently using Visual Studio Express C++ 2008, and have some questions about catch block ordering. Unfortunately, I could not find the answer on the internet so I am posing these questions to the experts. I notice that unless catch (...) is placed at the end of a catch block, the compilation will fail with error C2311. For example, the following would compile: catch (MyException) { } catch (...) { } while the following would not: catch (...) { } catch (MyException) { } a. Could I ask if this is defined in the C++ language standard, or if this is just the Microsoft compiler being strict? b. Do C# and Java have the same rules as well? c. As an aside, I have also tried making a base class and a derived class, and putting the catch statement for the base class before the catch statement for the derived class. This compiled without problems. Are there no language standards guarding against such practice please?

  Read the article

• Sorting tasks to assign

  - by Diego

  I've got a problem that I don't know where to start. I'd realy appreciate some help. The problem: I have several T task that must be done in D days by just 1 employee (let's forget using several resources right now). Each task can be done in some times (not all tasks can be done all time). e.g.: If my employee starts working at 8 o'clock and one task is "call a client". Maybe the client office opens at 9 o'clock. Also each task has a duration (really estimated). It is supposed that the D days are enough to do all task. I've to sort the tasks to the employee. e.g.: at monday 8:00 do task 7, then at 9:30 starts with task 2. In the example task 7 duration would be 1 and a half hour. Thanks for the help! Diego PD: If someone has a way to make this and it is not an algorithm never minds, please answer and I'll manage to think the algorithm. I just don't know how to face the problem. Edit Would Project be usefull? Edit 2 Tasks / Jobs dependency is NOT required

  Read the article

• If statement with code on same block in haml, RoR

  - by Micke

  Hello, i have this Haml view: !!! strict %html{:xmlns => "http://www.w3.org/1999/xhtml"} %head %meta{:content => "text/html; charset=utf-8", "http-equiv" => "Content-Type"} %title Lighty | #{@page_title || "Home"} %body #popup Login here #fade #wrapper #container #header %a#logo{:href => "/"} #menu %ul#main %li#lighty %a{:href => "/"} Lighty %ul %li %a Link here %li#community %a{:href => "/community"} Community #content And i would like to add an if on line #16 to check if it is the currently visited page and add the class "active" to the li if it returns true. How do i write that if statement there and is there any easier way to do this? My plan now is to use a variable like @current_page and testif it @current_page == "community" and add a class if it returns right. Am i thinking wrong? any easier way to accomplish this? Thanks for your answer and sorry for my bad english.

  Read the article

• Javascript Post Request like a Form Submit

  - by Joseph Holsten

  I'm trying to direct a browser to a different page. If I wanted a GET request, I might say document.location.href = 'http://example.com/q=a'; But the resource I'm trying to access won't respond properly unless I use a POST request. If this were not dynamically generated, I might use the HTML <form action="http://example.com/" method="POST"> <input type="hidden" name="q" value="a"> </form> Then I would just submit the form from the DOM. But really I would like JavaScript that allows me to say post_to_url('http://example.com/', {'q':'a'}); What's the best cross browser implementation? Edit I'm sorry I was not clear. I need a solution that changes the location of the browser, just like submitting a form. If this is possible with XMLHTTPRequest, it is not obvious. And this should not be asynchronous, nor use XML, so AJAX is not the answer.

  Read the article

• How to add and remove nested model fields dynamically using Haml and Formtastic

  - by Brightbyte8

  We've all seen the brilliant complex forms railscast where Ryan Bates explains how to dynamically add or remove nested objects within the parent object form using Javascript. Has anyone got any ideas about how these methods need to be modified so as to work with Haml Formtastic? To add some context here's a simplified version of the problem I'm currently facing: # Teacher form (which has nested subject forms) [from my application] - semantic_form_for(@teacher) do |form| - form.inputs do = form.input :first_name = form.input :surname = form.input :city = render 'subject_fields', :form => form = link_to_add_fields "Add Subject", form, :subjects # Individual Subject form partial [from my application] - form.fields_for :subjects do |ff| #subject_field = ff.input :name = ff.input :exam = ff.input :level = ff.hidden_field :_destroy = link_to_remove_fields "Remove Subject", ff # Application Helper (straight from Railscasts) def link_to_remove_fields(name, f) f.hidden_field(:_destroy) + link_to_function(name, "remove_fields(this)") end def link_to_add_fields(name, f, association) new_object = f.object.class.reflect_on_association(association).klass.new fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder| render(association.to_s.singularize + "_fields", :f => builder) end link_to_function(name, h("add_fields(this, \"#{association}\", \"#{escape_javascript(fields)} \")")) end #Application.js (straight from Railscasts) function remove_fields(link) { $(link).previous("input[type=hidden]").value = "1"; $(link).up(".fields").hide(); } function add_fields(link, association, content) { var new_id = new Date().getTime(); var regexp = new RegExp("new_" + association, "g") $(link).up().insert({ before: content.replace(regexp, new_id) }); } The problem with implementation seems to be with the javascript methods - the DOM tree of a Formtastic form differs greatly from a regular rails form. I've seen this question asked online a few times but haven't come across an answer yet - now you know that help will be appreciated by more than just me! Jack

  Read the article

• Why should we call SuppressFinalize when we dont have a destructor

  - by somaraj

  I have few Question for which I am not able to get a proper answer . 1) Why should we call SuppressFinalize in the Dispose function when we dont have a destructor . 2) Dispose and finalize are used for freeing resources before the object is garbage collected. Whether it is managed or unmanaged resource we need to free it , then why we need a condition inside the dispose funtion , saying pass 'true' when we call this overriden function from IDisposable:Dispose and pass false when called from a finalize. See the below code i copied from net. class Test : IDisposable { private bool isDisposed = false; ~Test() { Dispose(false); } protected void Dispose(bool disposing) { if (disposing) { // Code to dispose the managed resources of the class } // Code to dispose the un-managed resources of the class isDisposed = true; } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } } what if I remove the boolean protected Dispose function and implement the as below. class Test : IDisposable { private bool isDisposed = false; ~Test() { Dispose(); } public void Dispose() { // Code to dispose the managed resources of the class // Code to dispose the un-managed resources of the class isDisposed = true; // Call this since we have a destructor . what if , if we dont have one GC.SuppressFinalize(this); } }

  Read the article

• Ext-GWT / GXT (Not So) Simple Layout Issue?

  - by Xandel

  Hi all, I have posted this question on the Ext-GWT forums, I am just hoping that someone here might have an answer for me! I am struggling to do something I initially thought was simple but am beginning to believe is impossible... I have got a "layout template" of sorts - simply consisting of a few GWT DockLayoutPanel's within each other and finally ending in LayoutPanels. GWT's LayoutPanel is designed to size the widget (or Composite) that's added to it to its full size and does so perfectly with pure GWT widgets. The idea of my "layout template" is that I don't know the EXACT height and width of the very inner LayoutPanel's because I may set certain panels sizes (of the outer DockLayoutPanels) differently when instantiating this template. All I would like is to add a Grid component to one of the inner most LayoutPanels and have it size itself (height AND width) to fit as normal GWT widgets do (works perfectly with a GWT Label for instance). I am VERY new to GXT (as in I started using it earlier today) and I do realize that GXT builds its Components differently to the way GWT builds its Widgets on the DOM. Is there anyway to achieve the desired result? I have tried adding the grid to a ContentPanel with a Layout of FitLayout, I have tried AnchorLayout, I have tried adding the grid directly... Nothing seems to work... Any advice or even a push in the right direction would be greatly appreciated! Thanks in advance! Xandel

  Read the article

• How to Determine The Module a Particular Exception Class is Defined In

  - by doug

  Note: i edited my Q (in the title) so that it better reflects what i actually want to know. In the original title and in the text of my Q, i referred to the source of the thrown exception; what i meant, and what i should have referred to, as pointed out in one of the high-strung but otherwise helpful response below, is the module that the exception class is defined in. This is evidenced by the fact that, again, as pointed out in one of the answers below the answer to the original Q is that the exceptions were thrown from calls to cursor.execute and cursor.next, respectively--which of course, isn't the information you need to write the try/except block. For instance (the Q has nothing specifically to do with SQLite or the PySQLite module): from pysqlite2 import dbapi2 as SQ try: cursor.execute('CREATE TABLE pname (id INTEGER PRIMARY KEY, name VARCHARS(50)') except SQ.OperationalError: print("{0}, {1}".format("table already exists", "... 'CREATE' ignored")) # cursor.execute('SELECT * FROM pname') while 1: try: print(cursor.next()) except StopIteration: break # i let both snippets error out to see the exception thrown, then coded the try/finally blocks--but that didn't tell me anything about which module the exception class is defined. In my example, there's only a single imported module, but where there are many more, i am interested to know how an experienced pythonista identifies the exception source (search-the-docs-till-i-happen-to-find-it is my current method). [And yes i am aware there's a nearly identical question on SO--but for C# rather than python, plus if you read the author's edited version, you'll see he's got a different problem in mind.]

  Read the article

• Getting error detail from WCF REST

  - by Keith

  I have a REST service consumed by a .Net WCF client. When an error is encountered the REST service returns an HTTP 400 Bad Request with the response body containing JSON serialised details. If I execute the request using Fiddler, Javascript or directly from C# I can easily access the response body when an error occurs. However, I'm using a WCF ChannelFactory with 6 quite complex interfaces. The exception thrown by this proxy is always a ProtocolException, with no useful details. Is there any way to get the response body when I get this error? Update I realise that there are a load of different ways to do this using .Net and that there are other ways to get the error response. They're useful to know but don't answer this question. The REST services we're using will change and when they do the complex interfaces get updated. Using the ChannelFactory with the new interfaces means that we'll get compile time (rather than run time) exceptions and make these a lot easier to maintain and update the code. Is there any way to get the response body for an error HTTP status when using WCF Channels?

  Read the article

• ClickOnce Deployment Error - Access to the Path is Denied

  - by michael.lukatchik

  I have a WPF app that I'm deploying to a network path using ClickOnce deployment. After the app is deployed to a network location, I use the ClickOnce html page to launch the installation process. I am successfully able to download and install the app. However, my users are not able to download and install the app. When a user navigates to the ClickOnce html page and clicks to begin the installation process, the following error message is received: ERROR SUMMARY Below is a summary of the errors, details of these errors are listed later in the log. * Activation of http://software.mycompany.com/myapp/myapp.application resulted in exception. Following failure messages were detected: + Downloading file://dev/webs/software/myapp/myapp.application did not succeed. * [4/5/2010 1:56:59 PM] System.Deployment.Application.DeploymentDownloadException (Unknown subtype) - Downloading file://dev/Webs/software/myapp/myapp.application did not succeed. All signs point to this being a security issue. So, I've done the following: Ensured that "Everyone" had read access to the files that were being deployed as part of my project Ensured that "Everyone" had read access to the network location where the app was deployed (//dev/webs/software/myapp) Ensured that "Everyone" had read access to the IIS path where the ClickOnce html page is located In each of these cases, I've made no progress in getting the app to successfully deploy via ClickOnce. Again, the odd thing is that I am able to successfully walk through the process of downloading and installing the app. It's my users, though, that need the ability to download and install the app. I've looked extensively on the web for answers, but there hasn't been much. I'd like to resolve the issue without "re-installing" or "rigging" anything. I need a solid answer. Thank you all for your input!! Mike

  Read the article

• How do you parse a paragraph of text into sentences? (perferrably in Ruby)

  - by henry74

  How do you take paragraph or large amount of text and break it into sentences (perferably using Ruby) taking into account cases such as Mr. and Dr. and U.S.A? (Assuming you just put the sentences into an array of arrays) UPDATE: One possible solution I thought of involves using a parts-of-speech tagger (POST) and a classifier to determine the end of a sentence: Getting data from Mr. Jones felt the warm sun on his face as he stepped out onto the balcony of his summer home in Italy. He was happy to be alive. CLASSIFIER Mr./PERSON Jones/PERSON felt/O the/O warm/O sun/O on/O his/O face/O as/O he/O stepped/O out/O onto/O the/O balcony/O of/O his/O summer/O home/O in/O Italy/LOCATION ./O He/O was/O happy/O to/O be/O alive/O ./O POST Mr./NNP Jones/NNP felt/VBD the/DT warm/JJ sun/NN on/IN his/PRP$ face/NN as/IN he/PRP stepped/VBD out/RP onto/IN the/DT balcony/NN of/IN his/PRP$ summer/NN home/NN in/IN Italy./NNP He/PRP was/VBD happy/JJ to/TO be/VB alive./IN Can we assume, since Italy is a location, the period is the valid end of the sentence? Since ending on "Mr." would have no other parts-of-speech, can we assume this is not a valid end-of-sentence period? Is this the best answer to the my question? Thoughts?

  Read the article

• How to get stack trace information for logging in production when using the GAC

  - by Jonathan Parker

  I would like to get stack trace (file name and line number) information for logging exceptions etc. in a production environment. The DLLs are installed in the GAC. Is there any way to do this? This article says about putting PDB files in the GAC: You can spot these easily because they will say you need to copy the debug symbols (.pdb file) to the GAC. In and of itself, that will not work. I know this article refers to debugging with VS but I thought it might apply to logging the stacktrace also. I've followed the instructions for the answer to this question except for unchecking Optimize code which they said was optional. I copied the dlls and pdbs into the GAC but I'm still not getting the stack trace information. Here's what I get in the log file for the stack trace: OnAuthenticate at offset 161 in file:line:column <filename unknown>:0:0 ValidateUser at offset 427 in file:line:column <filename unknown>:0:0 LogException at offset 218 in file:line:column <filename unknown>:0:0 I'm using NLog. My NLog layout is: layout="${date:format=s}|${level}|${callsite}|${identity}|${message}|${stacktrace:format=Raw}" ${stacktrace:format=Raw} being the relevant part.

  Read the article

• The subsets-sum problem and the solvability of NP-complete problems

  - by G.E.M.

  I was reading about the subset-sums problem when I came up with what appears to be a general-purpose algorithm for solving it: (defun subset-contains-sum (set sum) (let ((subsets) (new-subset) (new-sum)) (dolist (element set) (dolist (subset-sum subsets) (setf new-subset (cons element (car subset-sum))) (setf new-sum (+ element (cdr subset-sum))) (if (= new-sum sum) (return-from subset-contains-sum new-subset)) (setf subsets (cons (cons new-subset new-sum) subsets))) (setf subsets (cons (cons element element) subsets))))) "set" is a list not containing duplicates and "sum" is the sum to search subsets for. "subsets" is a list of cons cells where the "car" is a subset list and the "cdr" is the sum of that subset. New subsets are created from old ones in O(1) time by just cons'ing the element to the front. I am not sure what the runtime complexity of it is, but appears that with each element "sum" grows by, the size of "subsets" doubles, plus one, so it appears to me to at least be quadratic. I am posting this because my impression before was that NP-complete problems tend to be intractable and that the best one can usually hope for is a heuristic, but this appears to be a general-purpose solution that will, assuming you have the CPU cycles, always give you the correct answer. How many other NP-complete problems can be solved like this one?

  Read the article

• Lambdas within Extension methods: Possible memory leak?

  - by Oliver

  I just gave an answer to a quite simple question by using an extension method. But after writing it down i remembered that you can't unsubscribe a lambda from an event handler. So far no big problem. But how does all this behave within an extension method?? Below is my code snipped again. So can anyone enlighten me, if this will lead to myriads of timers hanging around in memory if you call this extension method multiple times? I would say no, cause the scope of the timer is limited within this function. So after leaving it no one else has a reference to this object. I'm just a little unsure, cause we're here within a static function in a static class. public static class LabelExtensions { public static Label BlinkText(this Label label, int duration) { Timer timer = new Timer(); timer.Interval = duration; timer.Tick += (sender, e) => { timer.Stop(); label.Font = new Font(label.Font, label.Font.Style ^ FontStyle.Bold); }; label.Font = new Font(label.Font, label.Font.Style | FontStyle.Bold); timer.Start(); return label; } }

  Read the article

• JFreeChart - change SeriesStroke of chart lines from solid to dashed in one line

  - by MisterMichaelK

  The answer accepted here (JFreechart(Java) - How to draw lines that is partially dashed lines and partially solid lines?) helped me start down the path of changing my seriesstroke lines on my chart. After stepping through my code and watching the changes, I see that my seriesstroke does in fact change to "dashedStroke" when it is supposed to (after a certain date "dai"), but when the chart is rendered the entire series line is dashed. How can I get a series line to be drawn solid at first and dashed after a set date? /* series line modifications */ final Number dashedAfter = timeNowDate.getTime(); final int dai = Integer.parseInt(ndf.format(timeNowDate)); XYLineAndShapeRenderer render = new XYLineAndShapeRenderer() { Stroke regularStroke = new BasicStroke(); Stroke dashedStroke = new BasicStroke( 1.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 1.0f, new float[] {10.0f, 6.0f}, 0.0f ); @Override public Stroke getItemStroke(int row, int column) { Number xVal = cd.getXValue(row, column); int xiv = xVal.intValue(); if (xVal.doubleValue() > dashedAfter.doubleValue()) { return dashedStroke; } else { return regularStroke; } } }; plot.setRenderer(render);

  Read the article

• Beginner question - Loop invariants (Specifically Ch.3 of "Accelerated C++")

  - by Owen

  Hi - as I said, a complete beginner question here. I'm currently working my way through "Accelerated C++" and just came across this in chapter 3: // invariant: // we have read count grades so far, and // sum is the sum of the first count grades while (cin >> x) { ++count; sum += x; } The authors follow this by explaining that the invariant needs special attention paid to it because when the input is read into the variable x, we will have read count+1 grades and thus the invariant will be untrue. Similarly, when we have incremented the counter, the variable sum will no longer be the sum of the last count grades (in case you hadn't guessed, it's the traditional program for calculating student marks). What I don't understand is why this matters. Surely for just about any other loop, a similar statement would be true? For example, here is the book's first while loop (the output is filled in later): // invariant: we have written r rows so far while (r != rows) { // write a row of output std::cout << std::endl; ++r; } Once we have written the appropriate row of output, surely the invariant is false until we have incremented r, just as in the other example? It's probably something really obvious, anyone could enlighten me as to what makes these two cases different, that'd be great - and thanks in advance for taking the time to answer such a complete novice question. Owen

  Read the article

• Assert.AreEqual to not fail when comparing an enum and an int

  - by codingbear

  I'm not sure if this is doable, but I will just give a shot. I am calling Assert.AreEqual() method. For the parameters, I'm passing... an enum value which has Int32 as the underlying type because I didn't specify the base type an int (Int32) value Assert fails because it sees that the enum is not int (which is definitely correct). However, is there a way to make this Assert pass when the enum has the correct int value as the 2nd parameter? I can cast the enum to int and have it a quick fix, but it's really ugly. I was expecting some kind of overriding a method that Assert uses to compare 2 different objects and implicitly make that enum type look like an int. However, I wasn't successful at finding any hint/answer around that so far. Someone suggested to create a type converter and use the TypeConverterAttribute to get around. If this works for sure and is the only way to do it, I would; however, it does seem a lot of unnecessary work.

  Read the article

• Best cubicle toys for programming

  - by dlamblin

  I need some employee/co-worker Christmas gift ideas. Do you have any good cubicle toys that help you to do any of: think about programming problems solve programming problems by representing common abstractions can be directly programmed can interface with a PC based IDE to be programmed. it may present problems that can be solved, to kick start problem solving. Disallowed items are: reference material in book, pamphlet, poster or cheat-sheet form, even if it has kick ass pop-cultural references. edibles. [discuss separately] things that need their own lab-space and/or extensive tools to be worked with. So yes, Lego Mindstorms come to mind, but they aren't cubicle toys because they cost more than cubicle toys would, and they have too many losable parts. comments on the answers so far: The 20 Questions game sounds quite neat as it could get you thinking; The bean balls could be used as tokens in a problem, so I can see that working. The magnetic toys like ball of whacks or the ball-and-stick ones present hands on fun of a structural nature... now can there be a similar hands on fun toy that aids in representing a solution to a problem? The Gui Mags clearly could, but they're quite utility oriented. The AVR Butterfly is less of a toy but definitely priced attractively, cheaper and more responsive than a basic stamp. I'm not going to pick an answer; there's several great suggestions here. Thank you.

  Read the article

• Hibernate limitations on using variables in queries

  - by sammichy

  I had asked the following question I have the following table structure for a table Player Table Player { Long playerID; Long points; Long rank; } Assuming that the playerID and the points have valid values, can I update the rank for all the players based on the number of points in a single query? If two people have the same number of points, they should tie for the rank. And received the answer from Daniel Vassalo (thank you). UPDATE player JOIN (SELECT p.playerID, IF(@lastPoint <> p.points, @curRank := @curRank + 1, @curRank) AS rank, IF(@lastPoint = p.points, @curRank := @curRank + 1, @curRank), @lastPoint := p.points FROM player p JOIN (SELECT @curRank := 0, @lastPoint := 0) r ORDER BY p.points DESC ) ranks ON (ranks.playerID = player.playerID) SET player.rank = ranks.rank; When I try to execute this as a native query in Hibernate, the following exception is thrown. java.lang.IllegalArgumentException: org.hibernate.QueryException: Space is not allowed after parameter prefix ':' Apparently this has been an open issue for the last couple of years, I want to know if the ranking query can be made to work either Without using any variables in the SQL query OR Using any workaround for Hibernate.

  Read the article

• Session variables with Cucumber Stories

  - by Matthew Savage

  I am working on some Cucumber stories for a 'sign up' application which has a number of steps. Rather then writing a Huuuuuuuge story to cover all the steps at once, which would be bad, I'd rather work through each action in the controller like a regular user. My problem here is that I am storing the account ID which is created in the first step as a session variable, so when step 2, step 3 etc are visited the existing registration data is loaded. I'm aware of being able to access controller.session[..] within RSpec specifications however when I try to do this in Cucumber stories it fails with the following error (and, I've also read somewhere this is an anti-pattern etc...): Using controller.session[:whatever] or session[:whatever] You have a nil object when you didn't expect it! The error occurred while evaluating nil.session (NoMethodError) Using session(:whatever) wrong number of arguments (1 for 0) (ArgumentError) So, it seems accession the session store isn't really possible. What I'm wondering is if it might be possible to (and I guess which would be best..): Mock out the session store etc Have a method within the controller and stub that out (e.g. get_registration which assigns an instance variable...) I've looked through the RSpec book (well, skimmed) and had a look through WebRat etc, but I haven't really found an answer to my problem... To clarify a bit more, the signup process is more like a state machine - e.g. the user progresses through four steps before the registration is complete - hence 'logging in' isn't really an option (it breaks the model of how the site works)... In my spec for the controller I was able to stub out the call to the method which loads the model based on the session var - but I'm not sure if the 'antipattern' line also applies to stubs as well as mocks? Thanks!

  Read the article

< Previous Page | 540 541 542 543 544 545 546 547 548 549 550 551  | Next Page >