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• How can I best study a problem to determine whether recursion can/should be used?

  - by user10326

  In some cases, I fail to see that a problem could be solved by the divide and conquer method. To give a specific example, when studying the find max sub-array problem, my first approach is to brute force it by using a double loop to find the max subarray. When I saw the solution using the divide and conquer approach which is recursion-based, I understood it but ok. From my side, though, when I first read the problem statement, I did not think that recursion is applicable. When studying a problem, is there any technique or trick to see that a recursion based (i.e. divide and conquer) approach can be used or not?

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• C library build system dependencies

  - by Ninefingers

  Hello all, This debate has cropped up on a mailing list for a project I'm involved in. Unfortunately we're quite a small bunch at the moment, so I want to ask a wider audience. We're writing a C library (for arbitrary precision arithmetic) and are investigating build systems. Currently we have a bash script in desperate need of work. I believe we can't use autotools etc due to licensing (bsd vs gpl). So I suggested we use a modern scripting language like python or perl. The question is: is having something like perl or python around at build time an unrealistic dependency on Unix-like platforms these days?

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• What is enterprise software, exactly?

  - by good_computer

  I don't understand the difference between "normal" software and enterprise software. Even after reading these... "Enterprise Software" on Wikipedia "Enterprise Software Is Sexy Again" on Techcrunch "The Great Enterprise Software Swindle" on Coding Horror I can't really wrap my head around the real differences. Is there any difference at all between the two? Why do people say enterprise software sucks?

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• I sold my source code to a client, can I now re-build similar code and sell to someone else?

  - by flashhag

  So we built a website and software for a client, charged our fee and handed over the code. The client then got a request from another company about the software. The client passed on the request but said since they owned the code they would need to recieve money for it. I'm thinking there are 2 options here: Work with the client as requested We've actually re-built the software, made it much better and use it for other projects. Am i in my rights to sell that direct to the company that enquired about it instead of going through the client? Any help on this would be much appreciated

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• Which of these design patterns is superior?

  - by durron597

  I find I tend to design class structures where several subclasses have nearly identical functionality, but one piece of it is different. So I write nearly all the code in the abstract class, and then create several subclasses to do the one different thing. Does this pattern have a name? Is this the best way for this sort of scenario? Option 1: public interface TaxCalc { String calcTaxes(); } public abstract class AbstractTaxCalc implements TaxCalc { // most constructors and fields are here public double calcTaxes(UserFinancials data) { // code double diffNumber = getNumber(data); // more code } abstract protected double getNumber(UserFinancials data); protected double initialTaxes(double grossIncome) { // code return initialNumber; } } public class SimpleTaxCalc extends AbstractCalc { protected double getNumber(UserFinancials data) { double temp = intialCalc(data.getGrossIncome()); // do other stuff return temp; } } public class FancyTaxCalc extends AbstractTaxCalc { protected double getNumber(UserFinancials data) { int temp = initialCalc(data.getGrossIncome()); // Do fancier math return temp; } } Option 2: This version is more like the Strategy pattern, and should be able to do essentially the same sorts of tasks. public class TaxCalcImpl implements TaxCalc { private final TaxMath worker; public DummyImpl(TaxMath worker) { this.worker = worker; } public double calcTaxes(UserFinancials data) { // code double analyzedDouble = initialNumber; int diffNumber = worker.getNumber(data, initialNumber); // more code } protected int initialTaxes(double grossIncome) { // code return initialNumber; } } public interface TaxMath { double getNumber(UserFinancials data, double initial); } Then I could do: TaxCalc dum = new TaxCalcImpl(new TaxMath() { @Override public double getNumber(UserFinancials data, double initial) { double temp = data.getGrossIncome(); // do math return temp; }); And I could make specific implementations of TaxMath for things I use a lot, or I could make a stateless singleton for certain kinds of workers I use a lot. So the question I'm asking is: Which of these patterns is superior, when, and why? Or, alternately, is there an even better third option?

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• Are there any resources on how to identify problems that could best be solved with templates?

  - by sap

  I decided to improve my knowledge in template meta-programming. I know the syntax and rules and been playing with counteless examples from online resources. I understand how powerful templates can be and how much compile time optimization they can provide but I still cant "think in templates", I can't seem to know by myself if a certain problem could be best solved with templates and if it can, how to adapt that problem to templates. Is there some kind of online resource or book that teaches how to identify problems that could best be solved with templates and how to adapt that problem?

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• Handling Indirection and keeping layers of method calls, objects, and even xml files straight

  - by Cervo

  How do you keep everything straight as you trace deeply into a piece of software through multiple method calls, object constructors, object factories, and even spring wiring. I find that 4 or 5 method calls are easy to keep in my head, but once you are going to 8 or 9 calls deep it gets hard to keep track of everything. Are there strategies for keeping everything straight? In particular, I might be looking for how to do task x, but then as I trace down (or up) I lose track of that goal, or I find multiple layers need changes, but then I lose track of which changes as I trace all the way down. Or I have tentative plans that I find out are not valid but then during the tracing I forget that the plan is invalid and try to consider the same plan all over again killing time.... Is there software that might be able to help out? grep and even eclipse can help me to do the actual tracing from a call to the definition but I'm more worried about keeping track of everything including the de-facto plan for what has to change (which might vary as you go down/up and realize the prior plan was poor). In the past I have dealt with a few big methods that you trace and pretty much can figure out what is going on within a few calls. But now there are dozens of really tiny methods, many just a single call to another method/constructor and it is hard to keep track of them all.

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• How do you end up with event-sourcing if you use a xDD approach?

  - by Tomas Jansson

  When working in a TDD or BDD manner your unit tests are supposed to drive your design. But how do you end up with event-sourcing using a xDD techniques? As I see it event sourcing is something you need to adopt early on to take full advantage of it. Lets say that you start without event-sourcing and do a release. Later on when you are releasing version 2.0 you realize that it would be great to use event-sourcing, but at that point you alread have missed all the events from version 1.0 so it makes it much harder to implement. Or do you take some kind of backup of your db from before event-sourcing and use that as base line and then add event-sourcing on top of that?

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• Acceptance tests done first...how can this be accomplished?

  - by Crazy Eddie

  The basic gist of most Agile methods is that a feature is not "done" until it's been developed, tested, and in many cases released. This is supposed to happen in quick turnaround chunks of time such as "Sprints" in the Scrum process. A common part of Agile is also TDD, which states that tests are done first. My team works on a GUI program that does a lot of specific drawing and such. In order to provide tests, the testing team needs to be able to work with something that at least attempts to perform the things they are trying to test. We've found no way around this problem. I can very much see where they are coming from because if I was trying to write software that targeted some basically mysterious interface I'd have a very hard time. Although we have behavior fairly well specified, the exact process of interacting with various UI elements when it comes to automation seems to be too unique to a feature to allow testers to write automated scripts to drive something that does not exist. Even if we could, a lot of things end up turning up later as having been missing from the specification. One thing we considered doing was having the testers write test "scripts" that are more like a set of steps that must be performed, as described from a use-case perspective, so that they can be "automated" by a human being. This can then be performed by the developer(s) writing the feature and/or verified by someone else. When the testers later get an opportunity they automate the "script" for regression purposes mainly. This didn't end up catching on in the team though. The testing part of the team is actually falling behind us by quite a margin. This is one reason why the apparently extra time of developing a "script" for a human being to perform just did not happen....they're under a crunch to keep up with us developers. If we waited for them, we'd get nothing done. It's not their fault really, they're a bottle neck but they're doing what they should be and working as fast as possible. The process itself seems to be set up against them. Very often we end up having to go back a month or more in what we've done to fix bugs that the testers have finally gotten to checking. It's an ugly truth that I'd like to do something about. So what do other teams do to solve this fail cascade? How can we get testers ahead of us and how can we make it so that there's actually time for them to write tests for the features we do in a sprint without making us sit and twiddle our thumbs in the meantime? As it's currently going, in order to get a feature "done", using agile definitions, would be to have developers work for 1 week, then testers work the second week, and developers hopefully being able to fix all the bugs they come up with in the last couple days. That's just not going to happen, even if I agreed it was a reasonable solution. I need better ideas...

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• White box testing with Google Test

  - by Daemin

  I've been trying out using GoogleTest for my C++ hobby project, and I need to test the internals of a component (hence white box testing). At my previous work we just made the test classes friends of the class being tested. But with Google Test that doesn't work as each test is given its own unique class, derived from the fixture class if specified, and friend-ness doesn't transfer to derived classes. Initially I created a test proxy class that is friends with the tested class. It contains a pointer to an instance of the tested class and provides methods for the required, but hidden, members. This worked for a simple class, but now I'm up to testing a tree class with an internal private node class, of which I need to access and mess with. I'm just wondering if anyone using the GoogleTest library has done any white box testing and if they have any hints or helpful constructs that would make this easier. Ok, I've found the FRIEND_TEST macro defined in the documentation, as well as some hints on how to test private code in the advanced guide. But apart from having a huge amount of friend declerations (i.e. one FRIEND_TEST for each test), is there an easier idion to use, or should I abandon using GoogleTest and move to a different test framework?

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• Transition from maintenance programming to design

  - by andrew wang

  What to do people 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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• Do we set the bar too high by requiring that code tests not suffer from buffer overflow?

  - by brice

  We are currently recruiting for a Junior Developer position working mainly in C on Linux. As part of the process, we require candidates to complete a code test at their leisure in C. So far we have rejected two candidates on the basis that their code, although readable and in one case rather idiomatic, suffered from buffer overflow errors due to unbounded buffer writes. Are buffer overflows acceptable from a graduate developer? Are we setting the bar too high? What is the expected capability of graduate/Junior engineers? [Edit]: We explicitly ask for error-checked, production quality code. We provide a test & build framework for the candidates

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• Should I implement slugs with my already fairly long URLs?

  - by Earlz

  I'm considering implementing slugs in my blog. My blog uses MongoDB. One of the side-effects of using MongoDB is that it uses relatively long hex string IDs. Example before: http://lastyearswishes.com/blog/view/5070f025d1f1a5760fdfafac after: http://lastyearswishes.com/blog/view/5070f025d1f1a5760fdfafac/improvements-on-barelymvc Of course, that's a relatively short title.. I have some longer ones, but intend to limit the maximum character limit for slugs to something reasonable. At what point does a URL become so long that it hurts SEO instead of improves it? In this case, should I leave my URLs alone, or add slugs?

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• English to French translation of computing terminology

  - by Rich

  I work in France as a Java programmer, mainly in French, but am a native English speaker. My level of French is pretty good (French wife!), but one thing I have problems with is working out whether to use English terminology or a French equivalent. Examples: lock (as in a synchronisation lock) - do I use the verb "locker" or do I use verrouiller? shard (databases) - "un shard" or "un tesson" (which means a shard of glass) ...and so-on... So, what do people recommend? Can anyone point out some good websites for translating this kind of terminology? The usual online translation tools are a bit too everyday English/French, not the slightly more specialised version that I find myself needing.

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• Web to Print system - which client side technology should I use

  - by mr null

  I'm getting started to develop Web to Print system. My main concern is which client-side techology should I use: jQuery/CSS Flex/ActionScript or something else? For now, idea is that user/customer choose Product eg: Business card Attributes: Dimensions,Paper type, ... etc Template or blank Adjust product (editor) Preview & order Output should be PDF 300dpi. My main issue is: adding/adjusting text in editor. (font size, font family...). Because application should be cross browser. And I think that 10px Arial can't be the same in Firefox 5 and IE 8. It must be pixel perfect in every browser. If somebody order $100 of business cards, and text is different that he/she saw when ordering - that is a big problem. So, Flash platform should be the answer. But, as I see it's dying technology, 2012 is here - HTML5 is replacing Flash rapidly. I hope that you understand me, so every guideline or few smart words would be very appreciating.

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• Using json as database with EF, how can I link EF and the json file during DbContext initialization?

  - by blacai

  For a personal testing-project I am considering to create a SPA with the following technologies: ASP.NET MVC + EF + WebAPI + AngularJS. The project will make use of small amount of data, so I was thinking I could use just a .json file as storage. But I am not sure about how to proceed with the link between EF and the json file in the initialization of the DbContext. I found a stackoverflow related question: http://stackoverflow.com/questions/13899342/can-we-use-json-as-a-database I know the basics of edit files and store data inside. What I tried is to get the data from the json file in the initilizer method and create the objects one by one. This is more a doubt about how this works if I save/update an object in the dbcontext, do I need to go through all the elements and add/update it manually? Is it better to rewrite the complete file? According to this http://stackoverflow.com/questions/7895335/append-data-to-a-json-file-with-php it is not a good practice to use json/XML for data wich will be manipulated. Anyone has experience with anything similar? Is this a really bad idea and I should use another kind of data-storage?

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• What should be allowed inside getters and setters?

  - by Botond Balázs

  I got into an interesting internet argument about getter and setter methods and encapsulation. Someone said that all they should do is an assignment (setters) or a variable access (getters) to keep them "pure" and ensure encapsulation. Am I right that this would completely defeat the purpose of having getters and setters in the first place and validation and other logic (without strange side-effects of course) should be allowed? When should validation happen? When setting the value, inside the setter (to protect the object from ever entering an invalid state - my opinion) Before setting the value, outside the setter Inside the object, before each time the value is used Is a setter allowed to change the value (maybe convert a valid value to some canonical internal representation)?

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• How to design application for scaling the application?

  - by Muhammad

  I have one application which handles hardware events connected on the same computer's PCIe slots. The maximum number of PCIe slots on motherboard are two. I have utilized both slots. Now for scaling the application I need either more PCIe slots in same computer or I use another computer. So consider I am using another computer with same application and hardware connected on the PCIe Slots. Now my problem is that I want to design application over it which can access both computers hardware devices and does the process on it. The processed data should be send back to the respective PC's hardware. Please refer the attached diagram for expansion.

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• What should developers know about Windows executable binary file compression?

  - by Peter Turner

  I'd never heard of this before, so shame on me, but programs like UPX can compress my files by 80% which is totally sweet, but I have no idea what the the disadvantages are in doing this. Or even what the compressor does. Website linked above doesn't say anything about dynamically linking DLLs but it mentions about compressing DESCENT 2 and about compressing Netscape 4.06. Also, it doesn't say what the tradeoffs are, only the benefits. If there weren't tradeoffs why wouldn't my linker compress the file? If I have an environment where I have one executable and 20-30 DLL's, some of which are dynamically loaded an unloaded fairly arbitrarily, but not in loops (hopefully), do I take a big hit in processing time decompressing these DLL's when they're used?

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• I'm a student learning C++ and I've recently found out about Ruby. Would learning (some of) Ruby help me with C++ or would it just confuse me?

  - by Von32

  Hi! As the title says, I'm a student that will be starting my second year of C++ very soon. I've discovered Ruby, however. While I've heard much buzz about the language before, I've disregarded it because I always thought it wasn't something that would be useful. However, I've found a number of FANTASTIC tutorials on ruby and am interested in learning it (probably because it seems so straightforward). Would playing around with ruby be a good or bad idea? I understand that there's not such thing as bad knowledge, but I'm afraid that Ruby will only confuse me when dealing with C++. How different from C++ is it? I've read it's based on C in some way, but my google-fu seems to be horrible today. How useful is Ruby in the real world? I'm not specifically asking about jobs- I'm more interested in what sort of applications may come from this language. Any specific examples worth looking at? Going back to Question two- I've read some posts on here that Ruby and C++ can hold hands once in a while. How flexible is this relationship? Is it rarely that this would work? Thank you Very much for your time! EDIT: This has to be the one community on the internet that doesn't suck. Why have I never posted before? You guys are awesome!

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• Will they release a Wrox Box 4?

  - by Winston Muller

  Hi, does anyone know if there will be a Wrox Box 4? I would love to get something like that, but the latest collection of Wrox books seems to be the release for 3.5. I really need to get up to date with the latest version of .NET. I'm not sure if there will be a Wrox Box 4 though, because it looks like Wiley is now publishing Wrox books under Wiley, and not Wrox anymore. So it looks like I'm going to have to go with Professional ASP.NET 4 in C# Instead of the Wrox Box 3.5

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• When to delete a branch in Git

  - by Jo-Herman Haugholt

  I have a script project I've been managing with Git. Besides two main branches, several minor branches have been introduced over time to cover minor features, tweaks or temporary changes. Some of these branches are nearing end-of-life, and I won't be updating them any more. What's the different philosophies for handling branches like this? Should they be removed, or left in the repository unmaintained? If I do, won't I end up with a cluttered repository?

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• Finding right bug tracker web application

  - by FullmetalBoy

  I'm looking for a bug tracking system (similiar as http://www.mantisbt.org) with these following requirements: Requirement specifications are: Upload picture and different files without any limitaton of the file's space. If user belong to a specific group or businesss group, the GUI:s logotype should be changed into group's logotype after the user has entered user name and password. All user use the same database with different GUI. Right information of unassigned, modified and resolved bug case will be displayed based on what group or business group that the user is assigned to. All information will display after the user has logged in. Enable to create 1 or more super user (administrator) and regular user. Right user with right group or business group will retrieve right information. Non functional requirement: The bugging tracker take place in a webbapplication. All information must use web browser to view all information.

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• Accessing UI elements from delegate function in Windows Phone 7

  - by EpsilonVector

  I have the following scenario: a page with a bunch of UI elements (grids, textblocks, whatever), and a button that when clicked launches an asynchronous network transaction which, when finished, launches a delegate function. I want to reference the page's UI elements from that delegate. Ideally I would like to do something like currentPage.getUIElementByName("uielement").insert(data), or even uielement.insert(data), or something similar. Is there a way to do this? No matter what I try an exception is being thrown saying that I don't have permissions to access that element. Is there a more correct way to handle updating pages with data retrieved over network?

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• Pattern for Accessing MySQL connection

  - by Dipan Mehta

  We have an application which is C++ trying to access MySQL database. There are several (about 5 or so) threads in the application (with Boost library for threading) and in each thread has a few objects, each of which is trying to access Database for its' own purpose. It has a simple ORM kind of model but that really is not an important factor here. There are three potential access patterns i can think of: There could be single connection object per application or thread and is shared between all (or group). The object needs to be thread safe and there will be contentions but MySQL will not be fired with too many connections. Every object could initiate connection on its own. The database needs to take care of concurrency (which i think MySQL can) and the design could be much simpler. There could be two possibilities here. a. either object keeps a persistent connection for its life OR b. object initiate connection as and when needed. To simplify the contention as in case of 1 and not to create too many sockets as in case of 2, we can have group/set based connections. So there could be there could be more than one connection (say N), each of this connection could be shared connection across M objects. Naturally, each of the pattern has different resource cost and would work under different constraints and objectives. What criteria should i use to choose the pattern of this for my own application? What are some of the advantages and disadvantages of each of these pattern over the other? Are there any other pattern which is better? PS: I have been through these questions: mysql, one connection vs multiple and MySQL with mutiple threads and processes But they don't quite answer exactly what i am trying to ask.

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