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  • What's the Difference Between These Two Ruby Class Initialization Definitions?

    - by michaelmichael
    I'm working through a book on Ruby, and the author used a slightly different form for writing a class initialization definition than he has in previous sections of the book. It looks like this: class Ticket attr_accessor :venue, :date def initialize(venue, date) self.venue = venue self.date = date end end In previous sections of the book, it would've been defined like this: class Ticket attr_accessor :venue, :date def initialize(venue, date) @venue = venue @date = date end end Is there any functional difference between using the setter method, as in the first example, vs. using the instance variable as in the second? They both seem to work. Even mixing them up works: class Ticket attr_accessor :venue, :date def initialize(venue, date) @venue = venue self.date = date end end

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  • Article about code density as a measure of programming language power

    - by prosseek
    I remember reading an article saying something like "The number of bugs introduced doesn't vary much with different programming languages, but it depends pretty much on SLOC (source lines of code). So, using the programming language that can implement the same functions with smaller SLOC is preferable in terms of stability." The author wanted to stress the advantages of using Functional Programming, as normally one can program with a smaller number of LOC. I remember the author cited a research paper about the irrelevance of choice of programming language and the number of bugs. Is there anyone who knows the research paper or the article?

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  • insert a time-stamp value in my db by php

    - by Erick
    I'm using oracle express and in my application i would insert a time-stamp value in my table: $marca = date('y-m-d H:i:s'); $query = " INSERT INTO SA_VERSIONE ( ID_ACCETTAZIONE, MARCA_TEMPORALE, TESTO, FIRMA, MEDICO) VALUES ('$id', '$marca', '$testo', '$firma', '$medico') "; $stid = oci_parse($conn, $query); oci_execute($stid); but when execute it return: Warning: oci_execute() [function.oci-execute]: ORA-01843: mese non valido in ... and say that the month is not valid

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  • PHP detecting filesystem encoding

    - by Evert
    Hi guys, I need to save files with non-latin filenames on a filesytem, using PHP. I want to make this work cross-platform. How do I know what encoding I can use to write the file? I understand many modern filesystems are UTF-8 based (is this correct?), but I doubt Windows XP is (for instance). So, is there a robust detection mechanism? Evert

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  • How do I upload a file, process it and return a result file in a single request to a REST WCF service?

    - by sharptooth
    I need to implement the following scenario in a REST service implemented in WCF: the user submits a binary file and a set of parameters the server consumes the file, does some clever work and generates a binary output file the user retrieves that binary result file and all that is done in a single operation from the client perspective. It's pretty easy in a non-REST service. How do I do that in a REST service? Where do I get started?

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  • Is ctrl-s save universal for save or are there different combinations for different languages

    - by aepheus
    I imagine that there are different combination, just looking for an affirmation. Or, are we developers really that english-centric? If I were in japan, using a word processor on some computer, would ctrl-s save? Are there keyboards where ctrl-s doesn't even exist (non-english keyboards)? Most of what I've seen usually has latin + [insert language here] characters, usually overridden on the normal qwerty keyboard.

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  • How to hide nested form from jQuery under IE8

    - by pduel
    An html segment with a div containing a form: <div class="hide"> Form header <form action='' method='post'> .... form content here </form> form footer </div> <script type="text/javascript"><!--// $(document).ready(function() { $('.hide').hide(); } //--></script> The jquery should hide the form, but does not do so under IE8. (version 8.0.60001) The form content gets hidden, as does the content within the class='hide' div but outside the form, but the form border continues to show, and retains its size. Does anybody have a workaround for this? jQuery is version 1.4.2 I tried to create a small problem demo in jsfiddle, but that site was not functional in the IE browser.

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  • Good concurrency example of Java vs. Clojure

    - by Michiel Borkent
    Clojure is said to be a language that makes multi-thread programming easier. From the Clojure.org website: Clojure simplifies multi-threaded programming in several ways. Now I'm looking for a non-trivial problem solved in Java and in Clojure so I can compare/contrast their simplicity. Anyone?

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  • Can anyone help with this Magento error?

    - by Duane
    Fatal error: Call to a member function getArea() on a non-object in {directory}/includes/src/Mage_Core_Model_App_Area.php on line 155 Cropped up when I installed an extension that I wrote on a clean install of Magento. When ported to the dev server it took it down and I cant seem to find where it has originated. Disabling the extension changes nothing. Along with clearing the cache and all the regular Magento hiccups. I've ensured that file permissions are correct to the best of my knowledge.

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  • Dynamic sizing of SSRS Report....

    - by Mike
    Hello....I have a report with 12 Tablixes on it. The user can pcik and choose which one of these Tables and their associated data shows when the Report is generated. However, when chosing a subset of the 12 tables, the report shows blank space where I hide the non-selected tablse. Is there any way to make the report resize/fit the size of the selected tables...truncating the white space where the invisible tables are? Thanks

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  • Profiling tool for Clojure?

    - by j-g-faustus
    Hi, does anyone know of a good profiling tool or library for Clojure? I would prefer something that could be used from the REPL, along the lines of (with-profiling ...) in Allegro Common Lisp back in the day. Is there anything along those lines? Or do you have any experience with (non-commercial) Java profilers that work well with Clojure?

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  • Is it OK to try to use Plinq in all Linq queries?

    - by Tony_Henrich
    I read that PLinq will automatically use non parallel Linq if it finds PLinq to be more expensive. So I figured then why not use PLinq for everything (when possible) and let the runtime decide which one to use. The apps will be deployed to multicore servers and I am OK to develop a little more code to deal with parallelism. What are the pitfalls of using plinq as a default?

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  • C++ class member functions instantiated by traits

    - by Jive Dadson
    I am reluctant to say I can't figure this out, but I can't figure this out. I've googled and searched Stack Overflow, and come up empty. The abstract, and possibly overly vague form of the question is, how can I use the traits-pattern to instantiate non-virtual member functions? The question came up while modernizing a set of multivariate function optimizers that I wrote more than 10 years ago. The optimizers all operate by selecting a straight-line path through the parameter space away from the current best point (the "update"), then finding a better point on that line (the "line search"), then testing for the "done" condition, and if not done, iterating. There are different methods for doing the update, the line-search, and conceivably for the done test, and other things. Mix and match. Different update formulae require different state-variable data. For example, the LMQN update requires a vector, and the BFGS update requires a matrix. If evaluating gradients is cheap, the line-search should do so. If not, it should use function evaluations only. Some methods require more accurate line-searches than others. Those are just some examples. The original version instantiates several of the combinations by means of virtual functions. Some traits are selected by setting mode bits that are tested at runtime. Yuck. It would be trivial to define the traits with #define's and the member functions with #ifdef's and macros. But that's so twenty years ago. It bugs me that I cannot figure out a whiz-bang modern way. If there were only one trait that varied, I could use the curiously recurring template pattern. But I see no way to extend that to arbitrary combinations of traits. I tried doing it using boost::enable_if, etc.. The specialized state information was easy. I managed to get the functions done, but only by resorting to non-friend external functions that have the this-pointer as a parameter. I never even figured out how to make the functions friends, much less member functions. The compiler (VC++ 2008) always complained that things didn't match. I would yell, "SFINAE, you moron!" but the moron is probably me. Perhaps tag-dispatch is the key. I haven't gotten very deeply into that. Surely it's possible, right? If so, what is best practice?

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  • Request.Browser.Platform not returning iPad, OSX, or Windows7

    - by rockinthesixstring
    I'm working on some advanced browser detection, and I've downloaded the MDBF browser file from CodePlex. Unfortunately my Request.Browser.Platform, along with a few other things is returning "Unknown" on both my iPad Mac OSX (Snow Leopard) and on Windows7 Does anyone know of a good advanced .browser file out there that does the same thing for non mobile devices as the MDBF does for mobile devices?

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  • Using Jquery to pull Wordpress post feed into static page

    - by JCHASE11
    Just like using the many twitter or facebook widgets out there that pull the feed and display it in a nice widget, I want to create a "widget" that pulls a feed from a wordpress blog that I have, and displays it on a static, non-wordpress page. Before I try getting my hands dirty with jquery, do you know if there is any pre-existing code or plugins out there that I can use?

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  • Complex Calculations

    - by mson
    What are the best tools (most efficient) available in .NET (C#) for calculating: integrals partial derivatives other non-trivial math Can people please comment on Mathematica and Matlab and their integration into C#?

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  • validating html files with latex commands

    - by robezy
    I'm using latex commands in my html code. When I validate the at w3c validator, it is giving me inavlid markup message. Line 105, Column 31: non SGML character number 12 \begin{equation}(x^{2})^{4+(frac{1}{5})}\end{equation} Is there a way to pass validation? Can I ignore this error?

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  • Web Application - Authentication / Login Framework

    - by user456563
    This is a very simple, probably a most asked question and frequently developed as part of any web application. Say I'm planning to build a web application and some of the functional requirements include (apart from the usual hard hitting security reqs), - Need to have users sign up for a new account profile - Authenticate user using the native app authentication / Facebook or Google or Yahoo or OpenId login - Allow lost password retrieval - Session handling needs Is there an out of the box frameworks (Drupal, Liferay??) that I can use to wrap my application which can be a bunch of JSP's or HTML's with JS? I know I'm asking a very simple and maybe a naive question. But this is a topic every web developer guru will go thru. Any help, advise and pointers much appreciated.

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