instruction stringlengths 34 36.1k |
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If I were to write say, an embeded linux video server, how much of the code do I have to offer to someone who requests the source? Do I have to offer the code that directly links against the GPL covered code or do I have to offer all code? For instance, if I use gstreamer, or any other LGPL code, on a linux platform in... |
What were the historical forces at work, the tradeoffs to make, in deciding to use groups of eight bits as the fundamental unit?
There were machines, once upon a time, using other word sizes. But today, for non-eight-bitness, you must look to museum pieces, specialized chips for embedded applications, and DSPs. How did... |
I am developer / analyst in an internal IT department at a medium sized business. I have to deal with business people all the time and many of the things I create can have profound impacts on the business. I am starting to regret not taking any business classes in college because I don't understand the first thing abou... |
I have read so many docs about naming conventions, most recommending both Pascal and Camel naming conventions. Well, I agree to this, it's ok. This might not be pleasing to some, but I am just trying to get your opinion on why you name your objects and classes in a certain way.
What happened to this type of naming conv... |
I was going to refactor my ASP.NET MVC application and inject some IoC. Last time I was using IoC, Unity was all the rage, but I hated it. It was difficult to setup and had very nondescript errors.
Does anyone have any suggestion or preferences?
|
I know that obj.func1().func2() is called method chaining, but what is the technical term for:
func1(func2(), func3());
Where return of a function is used as an argument to another.
|
What's the difference between MariaDB and MySQL? I'm not very familiar with both. I'm primarily a front end developer for the most part.
Are they syntactically similar? Where do these two query languages differ?
Wikipedia only mentions the difference between licensing:
MariaDB is a community-developed branch of the My... |
How to casually do the required Software Engineering and designing?
I am an inexperienced developer and face the following problem:
My company is a start up and has no fix Software engineering systems.
I am assigned tasks with not very clear and conflicting requirements.
I don't have to follow any designs or verify re... |
In one of our projects, we've built a Publisher - Subscriber Engine on Oracle Service Bus. The functionality being a series of events are published and subscribers (JMS queues) receive these whenever a new event is published.
We are facing some technical issues now, performance-wise and hence an architectural review is... |
I run across this problem a lot. For example, I currently write a read function and a write function, and they both check if buf is a NULL pointer and that the mode variable is within certain boundaries.
This is code duplication. This can be solved by moving it into its own function. But should I? This will be a prett... |
I am writing a commercial application that will make use of some open libraries licensed under different licenses.
For example one library will be licensed under the Apache 2.0 license, another will use the LGPL license. Both licenses allow usage in commercial applications, but differ in the way the attributions of lic... |
Most of the newcomers in programming start with basic projects to start with programming. Most of the C++ progammers spend some time with puzzles and contests but this is not always helpful. Sometimes you've to spend some time on real projects. Starting your own open source project could be a problem in self-learning f... |
Is there a name for a family of bugs, that are caused by assumption, that user would generate only 1 event during the execution of the handler ?
Simplest example is: animation triggered by click, which can run several copies of itself, if user rapidly clicks several times.
|
I'm just getting started with functional programming and I'm wondering about the correct way to comment my code.
It seems a little redundant to comment a short function as the names and signature already should tell you everything you need to know. Commenting larger functions also seems a little redundant since they ar... |
One of the practices set out in Jez Humble's Continuous Delivery is that you should build one package and then release it to each environment you deploy to, so that the deployment and the artifacts have themselves been tested multiple times before going to production.
I fully support this idea.
On the other hand, debug... |
I am putting together some guidelines for code reviews. We do not have one formal process yet and are trying to formalize it. And our team is geographically distributed.
We are using TFS for source control (we used it for tasks/bug tracking/project management as well, but we migrated that to JIRA) with Visual Studio 20... |
I work in embedded software, and for some reason, management wants to hide an Easter egg as means of IP protection. They call it a watermark, and since our software interact with the video preview feed (the image displayed on a screen before you take a photo), they want me to implement a trigger which will react to som... |
Let's say we have this base class:
class MyBase
{
public string Name { get; set; }
public string GetDescription()
{
var descriptionList = new List<string>() { this.Name };
descriptionList.AddRange(this.ExtraDescriptions.ToList());
return string.Join(", ", descriptionList();
}
... |
Possible Duplicate:
How to respond when you are asked for an estimate?
In my company, i have a strange managers, they always asks me before starting how is it going? And how long it will take to finish? From Day 1 to end of the project life. Behind the screen they do not have any idea what language i will need to u... |
I'm using an ORM (Propel) and PHP to create Objects and store them in a database. So, I'm facing a recurrent problem and I'm pretty sure this happened to someone before.
My data model looks something like this:
So class A needs a reference to something from the hierarchy of Clase Parent (abstract class), this is not t... |
I'm working in a little firm about 10 developpers,
we are working a kind of agile way but knowledgeless and without formalism.
I think be aware of what are agile method, what can they afford to us, may render more productive our products.
However there is a lot of agile method, which could be the simplest to "learn"?
... |
I heard the term "post-mortem debugging", and Wikipedia says it's debugging done after the program has crashed.
I often debug Python apps using a debugger that stops execution once an important-enough exception has been raised. Then I can use the debug probe to investigate.
Does this count as "post-mortem debugging"? B... |
I understand that in normal php if we're including a file we're merging the source of it in the script and it would take longer for that page to be parsed/processed but if we're using HipHop shouldn't it be ok to just create one single php file and include every file in it (that contains some class) and every page whic... |
We have been slowly replacing batch command files (windows .bat) which were simply jarring up the classes compiled in the developers IDE, with more comprehensive Ant builds (i.e. get from CVS, clean compile, jar, archive, email, etc.)
I've spent a lot of time learning (and debugging issues) with Ant, so I'm most comf... |
I'm making a webapp using Django. The Python convention for naming variables is lowercase_with_underscores, but the Javascript convention is camelCase. In addition, I've seen many people use lowercase-with-hyphens for CSS identifiers.
Would you suggest using all three naming conventions where appropriate, or picking ... |
I had a very stimulating and interessting discussion with a colleague about ORM and its pros and cons. In my opinion, an ORM is useful only in the rarest cases. At least in my experience.
But I don't want to list my own arguments at this time. So I ask you, what do you think about ORM? What are the pros and the cons?
|
During development process, things are constantly changing (especially in early phases). Requirements change, UI changes, everything changes. Pages that clearly belonged to specific controller, mutated to something completely different in the future.
For example. Lets say that we have website for managing Projects. One... |
I'm trying to convince another group in my company— that's about to hand code off to my group—that they need to provide more documentation in their source code, but they're treating it as a "nice to have".
In my view, it's a necessity. Of course, I also support intuitive naming conventions, but I think I'll have less... |
I've been studying cyclomatic complexity (McCabe) and reachability of software at uni recently. Today my lecturer said that there's no correlation between the two metrics, but is this really the case?
I'd think there would definitely be some correlation, as less complex programs (from the scant few we've looked at) see... |
Are there any differences between the Rational Unified Process (RUP) and the Unified Process (UP)? What does "Rational" mean, in this context?
|
I am looking for a recommendation here. I am struggling with whether it is better to return NULL or an empty value from a method when the return value is not present or cannot be determined.
Take the following two methods as an examples:
string ReverseString(string stringToReverse) // takes a string and reverses it.... |
In our organization, we've shifted to a more "service oriented architecture". To give an example, let's assume we need to retrieve a "Quote" object. This quote has a shipper, a consignee, phone numbers, contacts, email addresses, and other location information. In other words, a Quote object is made up of many other ob... |
This came up in code review at work in context of PHP and @ operator. However I want to try keep this in more generic form, since few question about it I found on SO got bogged down in technical specifics.
Accessing array field, which is not set, results in error message and is commonly handled by following logic (pseu... |
I've started to notice a recurring pattern to our team's burndown charts, which I call a "bowstring" pattern. The ideal line is the "string" and the actual line starts out relatively flat, then curves down to meet the target like a bow.
My theory on why they look like this is that toward the beginning of the story, we... |
Whilst I know questions on this have been covered already (e.g. https://stackoverflow.com/questions/5713142/green-threads-vs-non-green-threads), I don't feel like I've got a satisfactory answer.
The question is: why don't JVM's support green threads anymore?
It says this on the code-style Java FAQ:
A green thread refe... |
Rarst and I were debating offline about the use of the '@' error suppression operator in PHP, specifically for use to test for existence of "optional" array keys, i.e. array keys that are being used as a switch here a their lack of existence in the array is functionally equivalent to the array having the key with a val... |
When writing an interface to hardware over a communication bus, communications timing can sometimes be critical to the operation of a device.
As such, it is common for developers to spin up new threads to handle communications.
It can also be a terrible idea to have a whole bunch of threads in your system, an in the c... |
Flow is a concept introduced by Mihaly Csikszentmihalyi; in short, it means to get into the "zone". You feel immersed in your task, focused; the task can be difficult but challenging at the same time. When people achieve flow their productivity shoots up. Programming requires a great deal of mental focus because we oft... |
In agile pair programming it is recommended to switch pairs every now and then so as to increase the bus factor of the team. That means, most people in the team should work on different parts of the system at different times so that everyone has an understanding of it.
Now it is impssible that everyone has an expert ... |
I have always been skeptical of rewriting working code - porting code is no exception to this. However, with the advent of TDD and automated testing it is much more reasonable to rewrite and refactor code.
Does anyone know if there is a TDD tool that can be used for porting old code? Ideally you could do the following... |
Every primary expression is a postfix expression but a postfix expression is not primary expression.
But in mathematics, equality seems to be symmetrical. That is:
If A is B, then B is A
Why isn't this the case for postfix and primary expressions?
|
I am looking for some ideas here.
I read the article How should code reviews be Carried Out and Code Reviews, what are the advantages? which were very informative but I still need more clarity on the question below.
My Question is,
Being the target developer, can you suggest some best practices a developer can incorp... |
People are so happy the source code of Ice Cream Sandwich became available for syncing. Why is that cool?
|
I've been looking into the so-called "Micro ORMs" like Dapper and (to a lesser extent as it relies on .NET 4.0) Massive as these might be easier to implement at work than a full-blown ORM since our current system is highly reliant on stored procedures and would require significant refactoring to work with an ORM like N... |
A fellow developer has started work on a new Drupal project, and the sysadmin has suggested that they should only put the sites/default subdirectory in source control, because it "will make updates easily scriptable." Setting aside that somewhat dubious claim, it raises another question -- what files should be under s... |
Our architecture is HTTP servers (custom written) whereby custom clients send a HTTP request for some information and information is returned just as HTTP works. Now we need a special custom 'extension' which is a request which is a subscription for receiving asynchronous 'events' on a resource.
For example, the client... |
Possible Duplicate:
Differences between programming in school vs programming in industry?
This is a general discussion about programming in the industry environment.
The background story is that my colleague sent me a very interesting article called "10 Things Entrepreneurs Don’t Learn in College." The first point i... |
Possible Duplicate:
When are Getters and Setters Justified
Why exactly is having public and private accessors like these:
private string foo;
public string Foo
{
get
{
return foo;
}
set
{
foo = value;
}
}
considered better than just having public ones like this:
public strin... |
I need to write out a documentation for developers to be able to use some API web software how should i lay out a documentation? What should always be included? And does it need to be really long or keep it simple and easy as possible for anybody to understand?
|
At my company, there is a habit for the engineers to refer to their respective hardware/firmware/software in the first-person as if the device they are responsible for is a manifestation of themselves.
I'll give you an example:
Hardware Engineer: "I don't receive the first byte, so I stay off."
Software Engineer: "I'm... |
I've been working on a Zend Framework application which currently does a bunch of things through Zend Application and a few resource plugins written for it.
However, looking at this codebase now, it seems to me that using Zend_Application just makes things more complicated; and a plain, more "traditional" bootstrap fil... |
A few opinionated reasons I don't like the traditional ORM and ActiveRecord patterns:
They work only with a database. Sometimes I'm dealing with objects from an API and other objects from a database. All the implementations I have seen don't allow for that. Feel free to clue me in if I'm wrong on this.
They are brit... |
After reading several texts about meta-modeling I still do not really get the practical benefit. Sometimes I think it is only an interesting mind game but no useful tool. Sure it is wise to clarify your modeling vocabulary: some may say class where others say entity or concept, but this is just simple documentation you... |
Is PHP suitable for downloading large amounts of data, usually via cron? Should I worry about the memory footprint when I am using PHP for downloading multiple zip files?
|
Possible Duplicate:
Is there a language out there in which parameters are placed inside method name?
Does a language exist with such a syntax? If not, what are some of the limitations/disadvantages to this syntax in case I want to write a language that supported it?
Some examples:
sort(array, fromIndex, toIndex);
v... |
Sometimes it would be nice to be able to say something like:
(git|svn|hg|etc) diff Foo.c:main
(git|svn|hg|etc) log log Foo.c:main
to see the changes made to a specific function within a source file since the last commit, or the complete history of changes. My question is two-fold:
Does something exist that does this?... |
Is booth algorithm for multiplication only for multiplying 2 negative numbers (-3 * -4) or one positive and one negative number (-3 * 4) ? Whenever i multiply 2 positive numbers using booth algorithm i get a wrong result.
example : 5 * 4
A = 101 000 0 // binary of 5 is 101
S = 011 000 0 // 2's complement of 5 is 0... |
Prematurely introducing complexity by implementing design patterns before they are needed is not good practice.
But if you follow all (or even most of) the SOLID principles and use common design patterns you will introduce some complexity as features and requirements are added or changed to keep your design as maintain... |
A few months ago I dug into Subversion and GIT and was disappointed. They handle SOURCE CODE fine but not other aspects. For example, a web site under version control needs to manage file/directory ownership, file/directory read & write access, Access Control Lists, timestamps, database contents. and external links. Is... |
I am writing a bet settling app in C# and WinForms. I have 6 selections, 4 of them have won. I know that using the following formula from Excel:
=FACT(selections)/(FACT(selections-doubles))/FACT(doubles)
This is coded into my app and working well: I can work out how many possible doubles (e.g., AB, AC, AD, AE, BC, BD,... |
I am looking into some UML modeling software, which there is plentiful of on the market, but only a few I found support recording of requirements and written use cases (not the diagrams yet).
Are there any tools or methods I should check out for making requirements and use cases? Or should I just fire up Word and creat... |
(Almost-)POSIX-compliant operating systems and Windows are known to distinguish between 'binary mode' and 'text mode' file I/O. While the former mode doesn't transform any data between the actual file or stream and the application, the latter 'translates' the contents to some standard format in a platform-specific mann... |
In C++ when I wanted to mark that if is empty by design I added NULL; as statement:
if (cond1) {
...
} else if (cond2) {
NULL;
} else {
...
}
However in Java it seems to be impossible to have null; as statement. What is the correct way of marking empty by design if in Java (is it just comment)?
|
I was thinking about a live editing environment where code / a source file is synchronized so that changes made by one user would be carried across to all others editing the file.
Something like Google Wave, but for code.
Could this kind of an environment be better for the code, as changes are shared instantly?
(with r... |
I am teaching the course "Introduction in Programming" for the first-year students and would like to find interesting examples where the datatype size in bits, chosen by design, led to certain known restrictions or important values.
Here are some examples:
Due to the fact that the Bell teleprinter used 7-bit-code (lat... |
We have a lot of concepts in making diagrams like UML and flowcharting or just making up whatever boxes-and-arrows combination works at the time, but I'm looking at doing a visual diagram on something that's actually really complex.
State machines like those that parse HTML or regular expressions tend to be very long a... |
One of the projects I'm working on is online survey engine. It's my first big commercial project on Google App Engine.
I need your advice on how to collect stats and efficiently record them in DataStore without bankrupting me. Initial requirements are:
After user finishes survey client sends list of pairs [ID (int) + ... |
I learned REST and it feels a lot like CRUD (from what I have read about CRUD).
I know they are different, and I wonder if thinking they are similar means I don't understand them.
Is it that REST is a "superset" of CRUD? Does it do everything CRUD does and more?
|
I know there are many papers describing these three paradigms but I'm looking for a schematic explanation.
There are a few very good descriptions of aspect-oriented programming on here so I'm asking this question in the hope to get the kind of high-quality answer people at Stack Overflow are used to delivering.
|
We are developing a system for the retail market and of its features will enable clients (actually consumer clubs) to go through all transactions made by end-clients.
One of the ways to get this information will be via an API.
The idea is that there will be requests for reports with a start date and an end date, and a ... |
I have heard a lot of good about JSF but as far as I know people also had lots of serious complains with this technology in the past, not aware of how much the situation has improved. We are considering JSF as a probable technology for a social network project. But we are not aware of the performance scores of JSF neit... |
I've got a mental block as far as desigining the main screen interface for a desktop application that I'm currently upgrading. When I first developed this program the screen resolution was 640 X 480. Today there are multiple screen resolutions out there.
Where can I find ideas for a good main screen layout for a deskto... |
I recently implemented for fun Conway's Game of Life in Javascript (actually coffeescript but same thing). Since javascript can be used as a functional language I was trying to stay to that end of the spectrum. I was not happy with my results. I am a fairly good OO programmer and my solution smacked of same-old-same-o... |
I'm tasked with getting a legacy application under unit test. First some background about the application: It's a 600k LOC Java RCP code base with these major problems
massive code duplication
no encapsulation, most private data is accessible from outside, some of the business data also made singletons so it's not jus... |
Currently I have a WCF method which brings back all the data from the db and binds it to a grid, but I would like to call this method regularly to get the updated data back each time, to show the user real time data, what is the best way to go about this?
Thanks in advance.
|
I have been working on a integration that has posed an interesting user interface conundrum that I would like suggestions for.
The user interface is displayed within a third party product. The state of the interface is supplied by calls to a service I have written. There can be small delays between the actual state cha... |
So we are thinking that we might want to make timesheet submission easier by having our timesheet system send out a person's timesheet via email to the employee. The employee then should fill out the timesheet and send it back via email for it to be processed. Anybody know of some write up on how other's have done this... |
Suppose a user wants to transmit both audio and video to another user, whose formats are AMR for audio and H.264 for video. Does the user have to transmit audio and video packets always separately? Meaning that it is not possible to mix audio and video within the same RTP packed, is that correct?
If this is true I gu... |
When I google about Java, the companies most mentioned are Sun, Oracle and IBM. I know that Oracle bought Sun, and the Java official website is Oracle domain, so I can assume that Oracle is the official Java developer. But after a little research, IBM also provides many tutorials and documents about Java. Why is this? ... |
Working on a large and multi-tiered software project, I just found a recurring anti-pattern to be occurring in the code. I coulnd't find its definition in Wikipedia or other sources after a quick search, so I would like to ask you if there is a known anti-pattern for our current situation. I'll explain it both in the g... |
This might seems like a silly question to ask, but I can't really figure out the answer. The title pretty much says it all.
Let's say you have an open source music player, along comes someone, copies it, adds features, modifies the interface, etc and sells it. Nobody would find out. So how does it work?
Related: I'm wo... |
Today, Windows applications can be developed in numerous languages and frameworks. But in the upcoming Windows 8, with the introduction of WinRT, the development model is going change at a large scale. So, where do other programming languages fit in this model?
|
Possible Duplicate:
When are Getters and Setters Justified
In an Object oriented framework, one believes there must be strict encapsulation. Hence, internal variables are not to be exposed to outside applications.
But in many codebases, we see tons of get/set methods which essentially open a formal window to modify... |
I am new to web development and trying to study various types of websites as case study. Right now my focus is on how search engines works for an eCommerce website.
I know basic functioning for a search engine, i.e. crawl web pages, index them and the display the results using those indexes.
But I got little confuse i... |
When I'm doing design for a task, I keep fighting this nagging feeling that aside from being a general outline it's going to be more or less ignored in the end. I'll give you an example:
I was writing a frontend for a device that has read/write operations. It made perfect sense in the class diagram to give it a read a... |
I have recently moved to the dark side: I am now a CUSTOMER of software development -- mainly websites. With this new role comes new concerns.
As a programmer i know how solid an application becomes when it is properly layered, and I want to use this knowledge in my new job. I don't want business logic in my presenta... |
For single-threaded applications I like to use class diagrams to get an overview of the architecture of that application. This type of diagram, however, hasn’t been very helpful when trying to understand heavily multi-threaded/concurrent applications, for instance because different instances of a class "live" on differ... |
Here's the problem I'm facing:
Quote From Project Manager:
Hey Spark, I'm assigning you the task of developing a framework that could be used for many different iOS applications. Here are the requirements:
It should be able to detect the thickness of the thumb or fingers being used to manipulate the UI.
With this inf... |
I'm interested in learning Scala. I've been reading a lot about it, but a lot of people value it because it has an actor model which is better for concurrency, it handles xml in a much better way, solves the problem of first class functions.
My question is do you need to know Java to understand/appreciate the way thing... |
As much as I understand both concepts, I can't see how can I take advantage of JavaScript's closures and prototypes aside from using them for creating instantiable and/or encapsulated class-like blocks (which seems more of a workaround than an asset to me)
Other JS features such as functions-as-values or logical evalua... |
I'm trying to wrap my head around some details about how floating point math is performed on the CPU, trying to better understand what data types to use etc.
I think I have a fairly good understanding of how integer math is performed. If I've understood correctly, and disregarding SIMD, a 32-bit CPU will generally perf... |
I'm not sure I understand the role of jQuery/JavaScript in MVC. I've found an article about it on A List Apart, but it doesn't clear anything up for me.
Does it bridge the communication between the View and the Controller, or does it do something else?
|
Firstly I should explain the background. I am interested in high frequency trading programming roles. After looking at many job specs it is very clear that there is a big demand for programmers who have programmed Java and C++ on Unix as opposed to Windows.
My question is what are the differences a High Freq programmer... |
I'm on the way developing a Java application where user can provide a class diagram and get the corresponding Java code.
I don't know how can I let the user interactively draw a class diagram in Java. I am currently getting the required parameters like attributes, functions directly from the user, and then I render a c... |
When I was in college and as a programming language learner I wrote program for finding out prime numbers but then I never mind the program performance in terms of speed. Now after long time just started solving the problems from projecteuler.net.
Now I wonder is there any best and most used algorithm for finding the ... |
I have been working on a piece of software for a company, that they wish to resell.
There was an mail-based agreement upon a flat hourly rate for my work, and eager me chose to accept a rather low fee.
Due to the stress and tempo of the task, a direct contract was never formed or signed.
The software was developed loca... |
In the coming months we're going to begin a project where we take a system we've built for a client (v1) and rebuild it from scratch. Our goal with v2 is to make it modular, so that this specific client will have their own set of modules they use, then another client may use a different set of modules altogether. The... |
We have several highly complex ASP.NET web applications that are used internally by hundreds of users. We are trying to figure out which areas of the applications to invest in to improve functionality, but we aren't sure which screens/features are more heavily used. So, ideally, I'd like to find a way to add a layer ... |
Currently I am in the process of developing an importer of any existing, arbitrary (static) HTML website into the upcoming release of our CMS.
While the downloading the files is solved successfully, I'm pulling my hair off when it comes to detect a site structure (pages and subpages) purely from the HTML files, without... |
The process used at a certain company consists of:
Create a layout according to some designs made in a web page design tool. (CSS, html)
Requirements come in with "functional requirements". These consist of 100's of lines of business directions. E.G. Create a Table on page X. Column1 has numeric data. Column1 is... |
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