instruction stringlengths 34 19.9k |
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Is there a language with something like the following construct?
var_type(TYPE_1, TYPE_2,..., TYPE_N) obj;
and now its possible to:
TYPE_17 staticTypeVariable17;
obj = staticTypeVariable17;
TYPE_3 staticTypeVariable3;
obj = staticTypeVariable3;
without obj being a pointer of some base class and with no need for cast... |
I'd just like to hear about any experience creating a (simple) site for redirecting requests.
Basically we have multiple domains, but as we add more domains and change URLs, there is a huge problem of maintaining old links.
When discussing this we are considering using one constant site to determine where the present ... |
Reading this SO question it seems that throwing exceptions for validating user input is frowned upon.
But who should validate this data? In my applications, all validations are done in the business layer, because only the class itself really knows which values are valid for each one of its properties. If I were to copy... |
I am fairly new to Java and my experience is limited to Web Based Applications running on a Web Container (Jboss in my case).
Am I correct in saying that for Web Applications the web container takes care of multi-threading? If so, can I introduce new treads in a Web Based applications? Is there any advantage in doing ... |
When checking for parameter consistency a the top of a function body, what is the best strategy?
This one:
protected void function(Object parameter)
if (parameter == null)
return;
//... do things
}
...or this one:
protected void function(Object parameter)
if (parameter != null) {
//.... |
I'm reading through a PDF on C++ programming from this page on Stanford's site. It says that when you're creating a C++ header file for a library interface, use a #ifndef preprocessor command to make sure you don't compile the same interface twice.
So, your header would look something like this:
/**
MyFile.h
*/
#if... |
In computing what is meant by binary compatibility?
I read about it in context of serialization/deserialization that this process of serialize/deserialize should be binary compatible. What does it mean in this context? In particular I am interested in understanding the role of binary compatibility in a language like J... |
I got involved into a project where we are taking over a bunch of legacy code. Code is basically shell scripts and PL/SQL packages/procedures/functions. There is no documentation how the code works and there is also no comments on the shell scripts. I was thinking that first thing to do is to get an understanding of th... |
What should a programming language have so that it can be said to promote good reusability? Only generics and functions come to my mind when I hear the word reusability. What else make a programming language good for writing easily reusable code?
|
Is it completely unheard of to have a .c file dedicated to just data? In my case, I'd be using it for global variables that are shared across two other .c files. Here's specifically how I'm using it.
// serverth.h
struct serverth_parameters {
struct { // right now, this is the only struct needed
char * roo... |
re-edited by author: no this is not 2 questions. This is one question about code review questions containing two separate points. Please do not edit my question.
For naming variables, the two sides are regarding using articles (a, an, the) in the variable name (e.g. theBook vs. book -or- parseTheString vs. parseString... |
This has happend to me more than once, thought someone can give some insight.
I have worked on multiple projects where my project depends on external service. When I have to run the application locally, i would need that service to be up. But sometimes I would be coding to the next version of their service which may no... |
So there is a website that I want to build. It will be a review aggregator and probably a bit more. I want to build this website for three reasons:
I really think this website will be used by a reasonable amount of people
I want to practice my programming skills since currently at my job I am doing mostly scripting ... |
May be this is a stupid question, but I'm kind of intrigued.
Being JavaScript a prototype based language, with its pseudo-class function constructors sort of half baked (remember JavaScript: The Good Parts ...) I wonder how is it possible that it didn't have, right from the start, some easy way to access the prototype ... |
People often give me the "divide and conquer" tip, but I think for some problems it's not nearly enough. The problem with such a complex problem as the Hanoi Tower problem is that you can't even simulate or abstract parts of the problems even if you divide it into parts if you know what I mean. So, can anyone give me a... |
Throughout my life I've accumulated a fair share of scripts that have proven to be useful to me in many cases and might be useful to many others. I look at things like todo.txt (which probably started off as just someone's personal text file manager) and even simpler ones online and sometimes I feel like I want to put... |
It appears in not just one language that comments can't be nested. Do you have a good solution for this problem? One workaround in C/C++ and Java is to only use the single-line comment but it becomes impossible then to comment out a larger block. I'm facing something like this:
</li><!--
<li><!-- Save -... |
When creating websites, is it better to have a lot of images in one folder, or have them separated?
It's something that has always been in my mind but I never researched enough about it, and googling didn't give me many answers.
So I have been building mostly sites for real estate agencies since I started, and I always... |
How do I convince project managers, product owners, business analysts, clients and various other stakeholders that refactoring is a worthwhile and productive part of the development process?
As developers we all know that requirements change or are never fully explained from the start, and therefore how we wrote a piec... |
As far as I understand, the adapter pattern is creating a wrapper object for our real object of interest, simply one more level of indirection, which provides flexibility. The flexibility is in that if the real object's interface is changed, then we change the wrapper interface pointing at the real object, leaving the ... |
In a method, i have calls of single method of another object that returns field value, like foo.value(), which is defined like Field value() {return this.value;} Is it better to make a local variable, like Field value = foo.value() and use it. Or use many method calls of a single method? Why? How does it correlate with... |
I am constructing a ray tracing algorithm , i know that the first step is to develop camera and view plane specifications.
Now is the next step performing rasterization algorithm on image before a BVH tree is constructed so that intersection tests can be performed?
Kindly Guide
|
I had a discussion with my colleague about the following problem.
We have an application where we need filtering functionality. On any main screen within the upper navigation bar, there is a button in the upper right corner. Once you touch that button, an custom written Alert View like view will pop up modally, behind ... |
We java developers always know that you should always override equals() when you override hashCode(), but I consistently have trouble remembering this rule.
What is a clever mnemonic to help Java developers remember this?
|
Background
I have read people rebutting the fact that a certain software is free as in free speech, even when it is licensed under GPL.
Some say Java isn't free because to obtain a professional certification you must get it from Oracle.
Some say Java JDK is not free to re-distribute.
Some people even say the openJDK is... |
Please, tell me the things I must use for modeling an (Enterprise Architect) activity diagram of
object1.method1() calls object2.method2()
I'm able to dragndrop a method of a class from model tree-view to my diagram, and it appears as new action there. But there is no hint about its belonging object. Also I don't get ... |
I have this GPL project, it got stuck for like a year, I really like the idea, then somebody fork it and changed the whole thing but used the same name, I don't mind for the code (it was GPL after all) but I like the name. What's the etiquette for this kind of situation?
The project will benefit myself, and I like it,... |
I'm a server-side junkie, and by that I mean I spend time writing code that's not visible to anyone.
I'm interested in rounding out my skillset and becoming more self-sufficient with writing full-stack webapps.
But, I find it difficult to work with the the sort of 'organicity' of client-side html tech.
I know there is ... |
I am designing a small application that is really justa gui for a command line using vb.net.
Question 1.
Should messages(msgbox) to the user come from the UI or should messages come from subs and functions that the UI calls.
Question 2.
Should subs and functions throw new exceptions to the UI or should they be containd... |
Is a programmer required to learn and memorize all syntax, or is it ok to keep handy some documentation?
Would it affect the way that managers look at coders?
What are the downside of depending on intellisense and auto-complete technologies and pdf documentation?
|
Background
I am dynamically building an FQL query statement and because of the nature of the app, I exclude FB family members, this is the base portion of the query and remains fairly static. The query returns the FB profile pic and I display it on the UI.
However, after the FB friends are displayed on the UI, I want ... |
I'm currently working for a company on the engineering team of about 5-6 people and have been given the job of heading up the redesign of an embedded system tester. We've decided the general requirements and attributes that would be desirable in the system, and now I have to decide on a language to use for the system, ... |
The pipe & filter architectural pattern is defined as a chain of processing elements, arranged so that the output of each element is the input of the next. Every example seems to consider inter-process or inter-thread connection performed through some kind of shared buffer.
To me, it seems that Haskell function composi... |
When should or shouldn't a variable be declared as a custom Interface type?
When walking through some code, I required to know what was happening here:
Public Class MyMainProject
....
Public Sub DoMyWork()
Dim objIMyInterface As IMyInterface
....
objIMyInterface = GetReturnObject()
E... |
I need to create a string using the following algorithm:
Generate a GUID as a byte array.
Convert that GUID to a string.
From this string, get the UTF-8 encoding as a byte array.
From this byte array, hash those bytes to another byte array.
From this byte array, get the base64 encoding as a string.
Append a string con... |
I want to develop a mobile application. I recently read an article on Telerik Forum, which compares among three types of mobile application and I don't know which one should I select to begin with. Here is an image describing the pros and cons of different mobile design choices
To decide between these design choices, ... |
Everyone knows that the "current" way to do things is to have user-readable URLs. Like:
http://example.com/blog/edit/1234
Rather than:
http://example.com/blog.php?action=edit&id=1234
When exactly did people start making web technologies handling this though? I remember in the dark ages of the early 2000s, I don't remem... |
I'm building a perl application which does the following operations:
Copy a bunch of files (class fileFetcher )
Parse each file (class fileParser)
Store some data from each file in a database (class dbHelper)
Now, should I, in my main.pl (entry point of the script), construct an instance of each of these and call the... |
Normally I do this:
if (Animal is Dog)
{
Doc d = (Dog)Animal;
// d. etc..
}
else if (Animal is Cat)
{
Cat c = (Cat)Animal;
// c. ....
}
Is this a good way or are there better ways to implement this code above (performance, ...) ?
Should it be like this?:
Dog d = Animal as Dog;
if (d != null;)
{
... |
The tutorials I've read tell you to use [ValidateAntiForgeryToken] attributes and <%= Html.AntiForgeryToken() %> in your code.
I was wondering why this isn't a built-in automatic setting or at least a global toggle in the web.config. Perhaps it is, and I haven't realised, but I am doing it by hand and I can't help but ... |
I am coding a system where I have objects which represent a set of resources. These resources are identifiable (they have an ID). There can only be one resource with the same ID, and so multiple objects with the same ID really should have the same values.
My problem is with the equality concept in this case. Should it ... |
I am developing a software for a laboratory to test some devices. To test each device there are multi subtests which should be done to reach to the final result.To perform a complete test, the software must pass Stage1 then automatically goes to Stage2 then Stage3 and so on until the whole test is finished. meanwhile t... |
Simon Peyton Jones himself recognizes that reasoning about performance in Haskell is hard due to the non strict semantics.
I have yet to write a significant project in haskell so I wonder: can I reason about performance only at the beginning of a project (when choosing basic data structures & IO library) and whenever a... |
currently I'm designing an add-in for the modelling tool Enterprise Architect. The general architecture is shown in the picture below.
Basically every action where the add-in can react to is triggered by PreDefinedEvents for which the add-in can provide callback functions. These callback functions are the starting poi... |
I took a test recently and found that I could touch type comfortably at around 100 wpm... and if given some sort of autocorrect/intellisense then that would be even faster (who knows maybe 150 wpm?)...
I definitely do not program anywhere near that speed... This led me to wonder how exactly does one become faster at pr... |
A previous developer has a couple public classes that do not inherit from any other classes but are filled with static properties. Is this another way of creating a struct or enum? Is this an older or newer technique of housing static data to be referenced? I find it odd/different to see a class built in this way but a... |
I'm presenting a software design for approval today and as I'm going through the hundreds of pages of design documentation, cherry picking what's important, I'm unsure if I should start with the activity diagrams or use cases. I was thinking of having it stacked like so:
Activities Diagrams
Use Cases Diagrams
Sequenc... |
I have never published an app to app store.
I have a chance to buy an apple mac from someone.
Is it possible to use that to publish to app store? What if the first owner was also a developer?
If I buy Mac with the only intention of publishing an app should I only go for a new one to get developer license or I can do... |
This is my first contract negotiation. So I've written a program which supports some hardware that the company makes. (The support is important, and most customers will buy it, but the software product is ultimately optional.) It will sell for about $2K/license and they sell 70-80 hardware systems/year. The market ... |
For, say, a subtle background gradient to a web page, what are the advantages and disadvantages of saving it as a 16bit/channel png?
Are the colours represented by >8bits displayed in the intended detail in all browsers?
|
From the texts I have read so far, the conventions talk about organizing constructors, starting with the default, if any. I am wondering, should all classes have a default constructor anyway. This will at least help to create a simple instance of the class on the fly, without having to use a parameterized constructor, ... |
Java Swing GUI's don't look native by default (Except on Mac OS X for some reason). Swing uses it's own look and feel. You can get Swing to use the system look and feel by putting:
javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelClassName());
in the beginning of your main method, but: Wh... |
I have a Java program that takes about an hour to run. While it is running, if I change the source code and recompile it, will this affect the above run?
|
I am busy writing a Python application using ZeroMQ and implementing a variation of the Majordomo pattern as described in the ZGuide.
I have a broker as an intermediary between a set of workers and clients. I want to do some extensive logging for every request that comes in, but I do not want the broker to waste time d... |
I want to have sign up/login functionality on my site with a "Login with Facebook" and "Login with Twitter" button.
Considering the following scenario:
User A logs in with Twitter.
Account gets created.
User A logs out.
User A comes back next week and can't remember what they signed up with (or just feels like) using... |
I was wondering how secure public private key encryption methods are.
If two individuals were sending emails back and forth forever, where each person would encrypt the body of the email they were sending with the other person's public key, would anyone be able to decrypt the body of those emails after a while?
I'm as... |
Is there any consensus between languages how tests for emptiness are distinct from tests for noneness? In python the following expression is false:
{} is {}
However this expression evaluates to True
False is False
Why is the first expression not evaluated to True?
|
I am engaging in redesigning a linux c++ server application. The application acts as file relayer in the form of receiving file packets (incuding control packets and data packets) from client A, writing these packets into a local data file then create and update index file, finally start many threads to read the file d... |
I was wondering whether all programs run in a Loop, checking for variable changes then acting upon said changes followed by another Loop. Or do they run in a While statement, waiting for a variable to change before they execute a routine? Or am I just completely wrong?
|
We are working on project where we have to manage these conditions.
i.e.:
A User can save an order under these conditions:
User has permission "SaveOrder"
Order is in state "shipped"
Online Shop is opened.
This condition is for example - I would like to point out, that we have three conditions from different areas(ro... |
I am developing an application and i want to use two words somewhere in my application.
First i want to use the word "Safari" in a menu option which labels "Open in Safari"(for a url).
The second is the word "Apple" in my Terms pages where i want to use it in the phrase "....as provided by Apple",referring to technolog... |
I'm making a windows forms application which I want to install on a few computers that are all connected together on a network. Each of these computers have access to a number of servers on which various tasks are carried out etc.
I want each instance of the application in use to be able to store and retrieve data rega... |
"Extreme" suggests that it has very different from normal, very aggressive, exceeding limits, but in my opinion regular releases, pair programming, unit testing, collaboration with customers are quite normal and acceptable. What does extreme mean?
|
I am a young programmer (finished computer science university but still under a year of working in the industry) and I recently got a job working on some C code for a decent size web service. Looking at the code the only places I saw comments were when people were stashing their old code. Function and variable names ar... |
We have a stream of points with about 1000 points per second. For each point, we have a complex vector (hundreds of dimensions). Our goal, for each point is to link it to the 5 closest points that we've already seen.
We determine "closest" by computing a distance (euclidian or other) between 2 points. Obviously, in a p... |
I am working on a large asp.net app as a single developer. I will often work on a number of change requests concurrently. For example, a change required to the Finance component and a change required to the sales component.
I sometimes create a separate project to hold the changes and then reference the main applicat... |
Just out of curiosity. There are many open standards for data exchange, as well as standards for exchanging code (jsonp, for example).
But are there any standards for exchanging formulas/rules, for them to be executed on different platforms?
|
I am trying to reduce my problem to a max flow problem so I can run the max flow algorithm on this problem. But there are some things that I am missing while transforming my problem.
My problem is:
there are classes with a maximum capacity
there are students and their wish-list that includes 5 classes that they want ... |
I am looking for an I/O model, in any programming language, that is generic and type safe.
By genericity, I mean there should not be separate functions for performing the same operations on different devices (read_file, read_socket, read_terminal). Instead, a single read operation works on all read-able devices, a sing... |
I wonder if object initializing have some performance gain in ASP.NET website. I have an office mate that told me that object initialization is much readable and faster than constructor. But one of my office mate disagree with that and said that it always depends.
For example I am doing this:
using (var dataAccess = ... |
How can I make 1 class (base, generic or something else) from these two classes?
class A
{
A Link { get; set; }
}
class B
{
B Link { get; set; }
}
UPD: This is what I have now:
class BSTree
{
public BSTNode Root { get; set; }
}
class AVLTree
{
public AVLNode Root { get; set; }
}
class BSTNode
{
public BST... |
In recent years I've developed a habit of formatting SQL SELECT queries like so:
SELECT
fieldNames
FROM
sources
JOIN tableSource ON col1 = col2
JOIN (
SELECT
fieldNames
FROM
otherSources
) AS subQuery ON subQuery.foo = col2
WHERE
someField = somePredicate... |
I'm working on an old codebase which is... not perfect, in an environment which isn't either. It's not the worst codebase I've seen in my life, but there are still lots of issues: zero unit tests; methods with thousand+ lines of code; misunderstanding of basic object oriented principles; etc.
It hurts to maintain the c... |
We've all had this experience. You go to someone who you know has the answer to a question, ask that person the question and they answer with the typical response: "why?" You explain why you need to know, and they attempt to solve your problem.
It takes time, arm twisting and patience to steer the conversation back to ... |
I was studying Mediator Pattern and I noticed that to use this pattern you should register the Colleagues into Mediator from the Colleague concrete classes. for that we have to make an instance of Mediator inside Colleague concrete classes which violates IoC and you can not inject the Colleagues into Mediator (as far ... |
I am currently learning about TDD and trying to put it into practice in my personal projects. I have also used version control extensively on many of these projects. I am interested in the interplay of these two tools in a typical work flow, especially when it comes to the maxim to keep commits small. Here are some exa... |
I'm writing a game that has a lot of time based aspects. I use time to help estimate player positions when the network stalls and packets aren't going through (and the time between packet's being received and not). It's a pacman type game in the sense that a player picks a direction and can't stop moving, so that syste... |
I'm trying to put together an algorithm that will display the node degree for every node in a breadth first tree graph (assume BFS was called). Assume it's an undirected graph. I'm not sure how to get the node degree of a node when going through the graph. I was thinking about adding up every occurrence of the node ... |
About duck typing:
Duck typing is aided by habitually not testing for the type of arguments in method and function bodies, relying on documentation, clear code and testing to ensure correct use.
About argument validation (EAFP: Easier to ask for forgiveness than permission). An adapted example from here:
...it is co... |
I just had a doubt in my mind. The following subroutine(to search an element, in a list, for example) has a return statement at the end:
list *search_list(list *l, item_type x) {
if (l == NULL) return(NULL);
if (l->item == x)
return(l);
else
return( search_list(l->next, x) );
}
I cannot get the significa... |
I've heard ProGuard's Jar shrinker affects the performance of you application. Is this true? And if so just how much slower does the Jar go shrinked compared to unshrinked?
|
I am a bit puzzled on whenever or not to include break after the last case, often default.
switch (type) {
case 'product':
// Do behavior
break;
default:
// Do default behavior
break; // Is it considered to be needed?
}
breaks sole purpose is in my understanding to stop the ... |
I need to generate a hyperexponential distribution for my project. I have already implemented a poisson generating algorithm given by Donald Knuth, but I couldn't find an algorithm for generating a hyper exponential random variable.
I am provided with the mean and variance required of the distribution and I need an alg... |
I'm currently working as an intern at a very large, non-software development company. The position I applied for wasn't specifically a development position, but the team that hired me wanted a CS major to help try to develop some internal projects for them. I've been here for four weeks and the initial bewilderment i... |
I am trying to prepare my first software design document. I am self-taught and have no formal training in CS. Having done a wee bit of reading up on it beforehand, I have created a list of Requirements, Qualities and Non-Qualities for the system, which provide an overview from a managerial viewpoint on what the project... |
I have to solve a problem in the field of operations research. I want to gather some general approaches to evaluate them to pick the most promising to design a problem-related program.
Problem definition
Company ACME that sells customized collages and has a production that adheres to mass customization principles.
Pro... |
Most of my programming experience is in OOP where I have fully embraced the concepts thereof including encapsulation. Now I'm back to structured programming where I have a tendency to logicaly seperate my code using subprocedures. For example, if I have a large switch case (30 cases or more), I'll put that in it's ow... |
I have been teaching myself Python as a first language for 2 years now. So far I have done some online courses (NLP, Design of a Computer Program etc.) and solved some puzzles but never worked with big applications.
Yet right now I have the opportunity to do some real work with Python on a project at my university. It'... |
I have a product that lets game developers create games. Inside of their games they are required to give all the elements of their games GUIDs. I've told them that they need to generate their guids using a specific mechanism, but they seem to think that it won't cause any issues. What I'm concerned about is GUID collis... |
I often use static "factory" methods to create objects from database.
class Job {
protected $objDb;
public function __construct($objDb) {
$this->objDb = $objDb;
}
public static function LoadArrayByProjectId($intProjectId, $objDd) {
//some code that loads the jobs
$objJob = new Job($objDb);
$arr[] = ... |
I'm building a contest where you can win prizes by opening boxes. Whatever the box is open, i just send a request to the server to test if the user won something. Since this contest is not a "Register and we'll draw a winner after some time" type of contest, i'm a bit puzzled at what algorithm i should be taking to cal... |
Most issue trackers are targeted towards developers. But when working in a small team that includes business people: does it makes sense for them to put non-dev issues inside the tracker?
I must say I have never heard of that combination. In my full-time job the business things are done somewhere else. But in a star... |
In the project I'm working on, I'm using Guice and trying to do as much as possible with Dependency Injection. However, there's one little snag; many of my objects rely on an object Context. This is an immutable object but has some information which most of the other objects need to function properly. It never changes ... |
As a programmer, and taking into account the overall "funness" of the process, I'm tempted to start a project in Sinatra where the back end's sole concern is the logic, and returning a Json API, and then writing a javascript application that would interact with that API for rendering the actual content to the user.
I'm... |
I derived an open-sourced work, Service-Nucleus, based on Netflix's Karyon (Apache License) and Google's AngularJS (MIT License).
I want to make sure proper licensing and copyrights are in place, and I am not sure how to honor those projects and move forward legitimately at the same time.
I've researched this to some l... |
I'd like to state first that I'm a 19 year old programmer living in Portugal, and have recently started my first REAL programming job.
I say "REAL" because at my previous jobs, I was normally the sole developer just working on creating and updating a sole website and further developing ideas for the company. (I've work... |
Imagine this scenario:
You've created a multiplayer game app for a mobile platform such as Android. You successfully set it up with one server, you figured out how to do that. It works quite well.
To your surprise, the game TAKES OFF. Server demands explode. You need to scale, but you have hardly any experience with ru... |
I know there have been countless discussions about this but I think this question is slightly different and may perhaps prompt a heated discussion (lets keep it friendly).
The scene:
I am developing a system as a means for me to learn various concepts and I came across a predicament which my brain is conflicting with. ... |
We are looking into enabling Sql Server Change Data Capture for a new subsystem we are building.
It's not really because we need it, but we are being pushed for having a complete history traceability, and CDC would nicely solve this requirement with minimum effort on our parts.
We are following an agile development pro... |
Relating to this question, I have another question regarding unit testing functions in the utility classes:
Assume you have function signatures like this:
public function void doSomething(InternalClass obj, InternalElement element)
where InternalClass and InternalElement are both Classes which source code are not avai... |
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