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  • Cyclic Dependencies.

    - by PhilCK
    Are cyclic dependencies a common thing in games dev? I ask as I keep getting into situation where I'm using and have been told more than once that they should be avoided. I am wondering if this is just a what people say as a general rule of thumb in the software development business. and that the nature of game programming produces such dependencies. // Foo #include <Bar.hpp> class Foo { bar& m_bar; }; and // Bar class Foo; class Bar { Foo* m_foo; }; I do this alot in Ruby, but dynamic languages are more forgiving in this instance, where as static ones, not so much.

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  • One method with many behaviours or many methods

    - by Krowar
    This question is quite general and not related to a specific language, but more to coding best practices. Recently, I've been developing a feature for my app that is requested in many cases with slightly different behaviours. This function send emails , but to different receivers, or with different texts according to the parameters. The method signature is something like public static sendMail (t_message message = null , t_user receiver = null , stream attachedPiece = null) And then there are many condition inside the method, like if(attachedPiece != null) { } I've made the choice to do it this way (with a single method) because it prevents me to rewrite the (nearly) same method 10 times, but I'm not sure that it's a good practice. What should I have done? Write 10 sendMail method with different parameters? Are there obvious pros and cons for these different ways of programming? Thanks a lot.

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  • What's special about currying or partial application?

    - by Vigneshwaran
    I've been reading articles on Functional programming everyday and been trying to apply some practices as much as possible. But I don't understand what is unique in currying or partial application. Take this Groovy code as an example: def mul = { a, b -> a * b } def tripler1 = mul.curry(3) def tripler2 = { mul(3, it) } I do not understand what is the difference between tripler1 and tripler2. Aren't they both the same? The 'currying' is supported in pure or partial functional languages like Groovy, Scala, Haskell etc. But I can do the same thing (left-curry, right-curry, n-curry or partial application) by simply creating another named or anonymous function or closure that will forward the parameters to the original function (like tripler2) in most languages (even C.) Am I missing something here? There are places where I can use currying and partial application in my Grails application but I am hesitating to do so because I'm asking myself "How's that different?" Please enlighten me.

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  • How do I create a PPA for a working program?

    - by d3vid
    Let's assume I have a working application written in C, C++ or Python. I want to create a Launchpad PPA so others can easily install it from a package. Please give step by step instructions for doing this from beginning to end. (Or provide a link that does the same ;) Does the programming language matter? (Could it be a bash script?) Do I need to add anything to my build? Where should the build install itself to? How do I define dependencies? How do I use dependencies? How do I create a .deb? What do I need to do before uploading to Launchpad?

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  • Is there any reason to use C++ instead of C, Perl, Python, etc.?

    - by Ehsan
    As a Linux (server side) developer, I don't know where and why should I use C++. When I'm going to performance, the first and last choice is C. When "performance" isn't the main issue, programming languages like Perl and Python would be good choices. Almost all of open source applications I know in this area has been written in C, Perl and Python, Bash script, AWK and even PHP, but no one goes to use C++. I'm not discussing about some other areas like GUI or web application, I'm just talking about Linux and about CLI and daemons. Is there any satisfiable reason to use C++?

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  • Compute if a function is pure

    - by Oni
    As per Wikipedia: In computer programming, a function may be described as pure if both these statements about the function hold: The function always evaluates the same result value given the same argument value(s). The function result value cannot depend on any hidden information or state that may change as program execution proceeds or between different executions of the program, nor can it depend on any external input from I/O devices. Evaluation of the result does not cause any semantically observable side effect or output, such as mutation of mutable objects or output to I/O devices. I am wondering if it is possible to write a function that compute if a function is pure or not. Example code in Javascript: function sum(a,b) { return a+b; } function say(x){ console.log(x); } isPure(sum) // True isPure(say) // False

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  • Transiltion from maintenance programing to design

    - by andrew wang
    What to do guys do develop a design for a s/w for a given set of requirements? I like many people joined a Semiconductor MNC and got stuck in maintenance for quite a couple of years. My work was usually changing a lines of code for windows drivers supplied by my company or a couple of small script (style like) C programs for validating h/w. As a result I developed the bad habit of 'programming by coincidence'. I have not developed the ability for designing tools/programs from scratch. I was the only s/w member of the local team and thus some grunt work from the well established other site of the company came to be done by me. Now I have moved to a different company and thus finding developing from scratch very difficult. How do I unlearn my bad habit and develop this ability of designing s/w and then coding it ?

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  • Should integer divide by zero halt execution?

    - by Pyrolistical
    I know that modern languages handle integer divide by zero as an error just like the hardware does, but what if we could design a whole new language? Ignoring existing hardware, what should a programming language does when an integer divide by zero occurs? Should it return a NaN of type integer? Or should it mirror IEEE 754 float and return +/- Infinity? Or is the existing design choice correct, and an error should be thrown? Is there a language that handles integer divide by zero nicely? EDIT When I said ignore existing hardware, I mean don't assume integer is represented as 32 bits, it can be represented in anyway you can to imagine.

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  • Solo vs Team development and the consequences

    - by Mathieu
    Hi, I've been programming for a while on different languages. I never really studied that at school nor worked on a team of more than 2 (me included). Still, I've been a professional developper for over three years. Last year, I took over my first C# project and it ended up being fine. I can't help but think that because I learned and worked alone I must be missing some concepts/hints/edge. For those who've been solo developpers before being part of a team, can you share your experience? Did you realize you were missing something? Did you find it hard? Did you learn faster after? Thank you!

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  • What tools should I consider if my aim is to make a game available to as many platforms as possible?

    - by Kenji Kina
    We're planning on developing a 2D, grid-based puzzle game, and although it's still very early in the planning stages, we'd like to make our decisions well from the beginning. Our strategy will be to make the game available to as many platforms as possible, for example PCs (Windows, Mac and/or Linux), mobile phones (iPhone and/or Android based phones), game consoles (XBLA and/or PSN) PC will have an emphasis, but I believe that's the most flexible platform so that shouldn't be a problem. So, what programming language, game engine, frameworks and all around tools would be best suited for our goal? P.S.: I'm betting a set of tools won't cover ALL of them, and that there will still be some kind of "translating" effort for some platforms, but we'd like to know what the most far reaching are.

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  • Customer Webcast: Alcatel-Lucent Creates a Modern User Experience

    - by [email protected]
    Today, customer satisfaction is critical to a company's long-term success. With customers searching the internet to find new solutions and offerings, it's more important than ever to deliver a modern and engaging user experience that's both interactive and community-based. Join us on June 30th for this exclusive LIVE Webcast with Saeed Hosseiniyar, CIO of Alcatel-Lucent's Enterprise Products Group, and Andy MacMillan, Vice President of Product Management for Oracle's Enterprise 2.0 Solutions. You'll learn how a modern customer service portal with integrated Web 2.0 and social media features can: Improve customer satisfaction by delivering rich, personalized and interactive content Speed product development by facilitating participation and feedback from customers through online communities Improve ROI with a unified platform that delivers content to employees, partners and customers You'll walk away with concrete strategies, best practices and real-world insights on how to transform your company's brand with a next-generation customer service and support site. Register today for this complimentary live Webcast!

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  • Do I really need to learn Python? [closed]

    - by Pouya
    These days, I see the name "Python" a lot. Mostly when I'm doing some programming on linux/mac, I see a trace of Python. I have a fair knowledge of C++ and I'm quite good at Java. I also know Delphi which comes handy sometimes. I've been good with these languages, however, I was wondering if learning Python could make it better. What does it offer that makes it worth learning? What are its key/unique advantages/features?

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  • How did programmers resolve their problems before the internet?

    - by 9a3eedi
    When programming, anytime I get stuck, perhaps with a compiler error that doesn't make sense, or from a GUI function that didn't do what I expected, I automatically google my problem, find someone else that faced the same thing, and read what's going on and why I'm getting the problem. Before the internet, how did people handle these situations? People used to read books and manuals more, I know. But books don't explain everything, like the odd compiler problem that you get sometimes, or nothing showing up on your screen despite you clearly writing correct OpenGL code. How did people cope when facing challenges? Did they simply "bash their head" on the wall till they figured it out? Is there something people used to do regularly on the side that gave them the ability to get themselves unstuck more easily? Were libraries/compilers much simpler back then? I've been asking this question because I sometimes feel guilty depending on Google so much when I'm pretty sure programmers before my time were more independent when it comes to facing these matters.

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  • On-the-fly graphical representation of code

    - by dukeofgaming
    I know about Omondo's plugin for live code-UML synchronization in Eclipse, but I was wondering if there was any other tool/IDE/IDE-extension that has some form of live graphical code representaiton (structural, flow, call-stacks, dependencies, etc.). I'm essentially looking for richer visual feedback on code while programming, not really looking for purely graphical code editors, though round-trips would be nice (edit graphically, code gets modified; edit code, representation gets modified). If you don't know about any graphical live documentation tool for code, maybe someone that can coexist with code, such as MySQL Workbench or Enterprise Architect.

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  • Is extensive documentation a code smell?

    - by Griffin
    Every library, open-source project, and SDK/API I've ever come across has come packaged with a (usually large) documentation file, and this seems contradictory to the wide-spread belief that good code needs little to no comments. What separates documentation from this programming methodology? a one to two page overview of a package seems reasonable, but elegant code combined with standard intelisense should have theoretically deprecated the practice of documentation by now IMO. I feel like companies only create detailed documentation and tutorials because its what they've always done. Why should developers have to constantly be searching through online documentation in order to learn how to do things when such information should be intrinsic to the classes, methods and namespaces?

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  • Vancouver .NET User Group

    - by pluginbaby
    While in Vancouver for my Silverlight training in early May, I will give a free Silverlight presentation at the local .NET User Group, .netBC. When: May 5, 2010, 6:30 PM Where: Building SW3 room 1750, BCIT Burnaby Campus, 3700 Willingdon Ave, Burnaby, BC, V5G 3H2 What: Silverlight 4 Business Applications “In this session a live demo will be built to show the new features of Silverlight 4 that helps you create business-oriented applications easier than ever. Importing/exporting data, printing, drag drop target, data visualization, context menu, WCF RIA Services and design-time enhancements in Visual Studio 2010.” Read all the details here: http://www.netbc.ca/DNCal/EventDetail.aspx?date=2010/05/05 See you there!   Thanks Telerik for helping this event to happen!   Technorati Tags: Silverlight,Silverlight Training

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  • PostgreSQL user authentication against PAM

    - by elmuerte
    I am trying to set up authentication via PAM for PostgreSQL 9.3. I already managed to get this working on an Ubuntu 12.04 server, but I am unable to get this working on a Centos-6 install. The relevant pg_hba.conf line: host all all 0.0.0.0/0 pam pamservice=postgresql93 The pam.d/postgressql93 is the default config shipped with the official postgresql 9.3 package: #%PAM-1.0 auth include password-auth account include password-auth When a user tries to authenticate the following is reported in secure log: hostname unix_chkpwd[31807]: check pass; user unknown hostname unix_chkpwd[31808]: check pass; user unknown hostname unix_chkpwd[31808]: password check failed for user (myuser) hostname postgres 10.1.0.1(61459) authentication: pam_unix(postgresql93:auth): authentication failure; logname= uid=26 euid=26 tty= ruser= rhost= user=myuser The relevant content of password-auth config is: auth required pam_env.so auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 500 quiet auth required pam_deny.so account required pam_unix.so account sufficient pam_localuser.so account sufficient pam_succeed_if.so uid < 500 quiet account required pam_permit.so The problem is with the pam_unix.so. It is unable to validate the password, and unable to retrieve the user info (when I remove the auth entry of pam_unix.so). The Centos-6 install is only 5 days old, so it does not have a lot of baggage. The unix_chkpwd is suid and has execute rights for everybody, so it should be able to check the shadow file (which has no privileges at all?).

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  • Historical origins of Scala implicits

    - by Frank
    Scala has been called complex with its rich feature set by many of my colleagues and some even blamed all those new features of it. While most programmers are aware of the OO-features, and at least the decent ones also know about functional programming, there is one feature in particular in Scala for which I am not aware of its historical origins. Given that a major mantra of our profession is to not reinvent the wheel, I am rather confident, that Scala does not have any actual unheard-of-before features, but I stand to be corrected on this one if necessary. To get to the actual question, while I am aware of the origins of most of Scala's features I have never seen something like its implicit declarations before. Are there other (older!) languages out there which also provide this feature? Does it make sense to distinguish the different cases of implicits (as they may originate from different sources), namely implict conversions and implicit parameters?

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  • Wordpress theme for user generated content website

    - by iamjonesy
    I'm looking for a wordpress theme that I can work from. I'm basically creating a website like the following two http://www.damnyouautocorrect.com/ and http://icanhas.cheezburger.com/ - both are wordpress based websites which I guess are custom made themes. I'm looking for a theme that will let users enter content without beign logged in. Basically the post type has a title and a description and the name of the author. The homepage will show one post with a "Next" button. Clicking that will load the next post. The user content input just needs a title, description, and a name of the author. I'd also like to add voting up/down. I'm just asking first before I start hacking away at a theme.

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  • SQL Server Database In Single User Mode after Failover

    - by jlichauc
    Here is a weird situation we experienced with a SQL Server 2008 Database Mirroring Failover. We have a pair of mirrored databases running in high-availability mode and both the principal and mirror showed as synchronized. As part of some maintenance I triggered a manual failover of the principal to the mirror. However after the failover the principal was now in single-user mode instead of the expected "Principal/Synchronized" state we usually get. The database had been in multi-user mode on the previous principal before this had happened. We ended up stopping all applications, restarting the SQL Server instances, and executing "ALTER DATABASE ... SET MULTI_USER" to bring the database back to the expected "Principal/Synchronized" state in a multi-user mode. Question. Does anyone know where SQL Server stores information about whether a database should be in single-user mode or not? I'm wondering if there is some system database or table that has this setting recorded somewhere. In particular we had an incident once with the database on the original principal (the one I was failing over to) where when trying to detach the database it was put into single-user mode. I'm wondering if that setting is cached somewhere and is the reason that SQL Server put it back into single-user mode after a failover.

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  • What php programmer should know?

    - by emchinee
    I've dig the database here and didn't found any answer for my question. What is a standard for a php programmer to know? I mean, literally, what group of language functions, mechanisms, variables should person know to consider oneself a (good) php programmer? (I know 'being good' is beyond language syntax, still I'm considering syntax of plain php only) To give an example what I mean: functions to control http sessions, cookies functions to control connection with databases functions to control file handling functions to control xml etc.. I omit phrases like 'security' or 'patterns' or 'framework' intentionally as it applies to every programming language. Hope I made myself clear, any input appreciated :) Note: Michael J.V. is right claiming that databases are independent from language, so to put my question more precisely and emphasise differences: Practises or security, are some ideas to implement (there is no 'Pattern' object with 'Decorator()' method, is there?) while using databases means knowing a mysqli and a set of its methods.

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  • Nested languages code smell

    - by l0b0
    Many projects combine languages, for example on the web with the ubiquitous SQL + server-side language + markup du jour + JavaScript + CSS mix (often in a single function). Bash and other shell code is mixed with Perl and Python on the server side, evaled and sometimes even passed through sed before execution. Many languages support runtime execution of arbitrary code strings, and in some it seems to be fairly common practice. In addition to advice about security and separation of concerns, what other issues are there with this type of programming, what can be done to minimize it, and is it ever defensible (except in the "PHB on the shoulder" situation)?

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  • Would you use (a dialect of) LISP for a real-world application? Where and why?

    - by Anto
    LISP (and dialects such as Scheme, Common LISP and Clojure) haven't gained much industry support even though they are quite decent programming languages. (At the moment though it seems like they are gaining some traction). Now, this is not directly related to the question, which is would you use a LISP dialect for a production program? What kind of program and why? Usages of the kind of being integrated into some other code (e.g. C) are included as well, but note that it is what you mean in your answer. Broad concepts are preferred but specific applications are okey as well.

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  • How-To limit user-names in LightDM login-screen when AccountsService is used

    - by David A. Cobb
    I have several "user" names in passwd that don't represent real people, and that should not appear on the LightDM login-screen. The lightdm-gtk-greeter configuration file clearly says that if AccountsService is installed, the program uses that and ignores its owh configureation files. HOWEVER, there is less than nothing for documentation about how to configure AccountsService! Please, can someone tell me how to configure the system so that only an explicitly specified group of users are shown on the greeter? I could uninstall AccountsService. I did that before, but it comes back (dependencies, I suppose). TIA

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  • Twin Cities Connected Systems User Group Meeting May 20th, 2010

    If you are in Minneapolis on Thursday May 20th please join us for the Twin Cities Connected Systems User Group Meeting. The meeting takes place at 6:00 p.m. at the Microsoft offices at 8300 Norman Center Drive, Bloomington, MN 55437. Scott Colestock will be speaking on Everything you wanted to know about Velocity but were afraid to cache Here is a write-up of what will be covered: Scott Colestock will be talking about Microsoft's AppFabric Cache.  The AppFabric Cache (aka Velocity)...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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