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• Immutable values in F#

  - by rsteckly

  I'm just getting started in F# and have a basic question. Here's the code: let rec forLoop body times = if times <= 0 then () else body() forLoop body (times -1) I don't get the concept of how when you define a variable it is a value and immutable. Here, the value is changing in order to loop. How is that different from a variable in C#?

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• Specification Pattern vs Spec in BDD

  - by cadmium

  I'm trying to explore Behavior Driven Design and Domain Driven Design. I'm getting that written specifications drive the tests in BDD, but also that business logic can be encapsulated using the specification pattern for re-use in domain objects and repositories, etc. Are these basically the same concept just used in different ways, used in conjunction together, or am I completely confusing the concepts? Please shed some light, if possible.

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• How does Batcher Merge work at a high level?

  - by Mike

  I'm trying to grasp the concept of a Batcher Sort. However, most resources I've found online focus on proof entirely or on low-level pseudocode. Before I look at proofs, I'd like to understand how Batcher Sort works. Can someone give a high level overview of how Batcher Sort works(particularly the merge) without overly verbose pseudocode(I want to get the idea behind the Batcher Sort, not implement it)? Thanks!

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• wordpress backend: retrict post tags to site tags only

  - by Richard

  In the post screen, I want to remove the option of multi-authors being able to 'free tag' their posts. In other words, only allow tags that have been preset in the admin tags section.(these tags are of course visible in the tag cloud in posts screen) The concept is to prevent authors introducing random tags in their posts, leading to duplication and confusion.

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• Hashable, immutable

  - by joaquin

  From a recent SO question I realized I probably had a wrong concept of the meaning of hashable and immutable objects in python. What hashable means in practice?, What the relation between hashable and immmutable is? There are mutable objects that are hashable? And immutable not hashable?

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• C++0x - export gone, exception specs deprecated. Will this affect your code?

  - by Neil Butterworth

  This latest Herb Sutter trip report on the C++0x standardisation process indicates that the committee has decided to completely drop the "export" concept for templates, and to deprecate exception specifications. I think these are both good moves, but I'm interested if anyone out there has a code base where these changes will cause them sleepless nights?

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• why joiner doesn't have not equal to opearator in informatica?

  - by jest

  hi! I wonder why Informatica's joiner transformation doesn't support !=, =, <= operators?? why should they come up with a concept like lookup?? Thanks for your suggestions.

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• How does a portable Thread Specific Storage Mechanism's Naming Scheme Generate Thread Relative Uniqu

  - by Hassan Syed

  A portable thread specific storage reference/identity mechanism, of which boost/thread/tss.hpp is an instance, needs a way to generate a unique keys for itself. This key is unique in the scope of a thread, and is subsequently used to retrieve the object it references. This mechanism is used in code written in a thread neutral manner. Since boost is a portable example of this concept, how specifically does such a mechanism work ?

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• SVN: Nested repo

  - by Extrakun

  We are working with a PHP application which has no concept of switch-able themes; the situation is that we are modifying the application to add our own features, and CSS/Smarty templates for our own look and feel. We have 2 projects base on this application, each with a different layout/presentation. Hence I need to have one repo for the base application files, and one for the CSS/smarty templates. How should I go about doing this?

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• Python: using doctests for classes

  - by Adam Matan

  Hi, Is it possible to use Python's doctest concept for classes, not just functions? If so, where shall I put the doctests - at the class' docstring, or at the constructor's docstring? To clarify, I'm looking for something like: class Test: """ >>> a=Test(5) >>> a.multiply_by_2() 10 """ def __init__(self, number): self._number=number def multiply_by_2(self): return self._number*2 Thanks in advance, Adam

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• What exactly is a Class Factory?

  - by Olaseni

  I see the word thrown around often, and I may have used it myself in code and libraries over time, but I never really got it. In most write-ups I came across, they just went on expecting you to figure it out. What is a Class Factory? Can someone explain the concept?

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• Writing a factory for classes that have required arguments

  - by Kyle Adams

  I understand the concept of factory pattern such that you give it something it spits out something of the same template back so if I gave a factory class apple, I expect to get many apples back with out having to instantiate a new apple ever time. what if that apple has a required argument of seed, or multiple required arguments of seed, step and leaf? how do you use factory pattern here? that is how do I use factory pattern to instantiate this: $apple = new Apple($seed, $stem, $leaf);

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• How to create a stackoverflow like Q&A board ?

  - by Aakash Chakravarthy

  Hello, After using stackoverflow for weeks i am just addicted by its system and the "badges" system. Is it possible to create a simple Q&A board with this concept or is there any tutorials ?

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• Why is it called CopyConstruct_i_ble?

  - by FredOverflow

  As a non-native english speaker, I was wondering why the concept of being able to be constructed by the copy constructor is called CopyConstructible (as opposed to CopyConstructable). What are the exact rules that require an i instead of an a?

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• SQL reporting services beginner.

  - by SonOfOmer

  Hi everyone I am not clear with SQL reporting services can someone pls give me breef explanation or post some tutorial with examples and concept explanations. ] Thanks a lot.

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• Urgent : GPS timeout in android

  - by Farha Ansari

  Hi, In blackberry, we use a timeout to get the location, so that if it doesnt retun location in that much time period, we get to know. But in Android, there is no concept of timeout, can anyone please tell the alternative, that we can find out that after this much time there is no location update from GPS. Thanks

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• Which programming languages support constant methods?

  - by Derek Mahar

  Which programming languages other than C++ support the concept of a constant class method? That is, what languages allow the programmer to constrain a method in such a way that it is guaranteed not to change the state of an object to which the method is applied? Please provide examples or references in your answer.

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• Built-in precedence in Expression Trees?

  - by jdk

  I'm unable to find the .NET FCL built-in concept of precedence to leverage while constructing Expression Trees. Ref System.Linq.Expressions Namespace. Is this something that must be handled manually in code, or is it somehow implicit and I'm not recognizing it? Maybe through helper methods or classes? I want to apply it to math operations to ensure 3 + 5 * 10 results in 53 instead of 80.

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• Edge detection using wavelet

  - by cheoma

  I had done Edge detection using wavelet transform using thus steps changing the image to Gray scale decomposing the image using dwt2(discrete wavelet transform,Haar wavelet filter ) in to horizontal,vertical,diagonal and approximation(detail) further decomposing the horizontal part threshold (global threshold like canny Edge detection ) i got the edge but i got a problem while locating the edge to complete image to mean recovering original image using only the Edges so i need help concerning this either in concept ,mat lab code or references I hope i will get your help soon

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• setting up replication in mysql pros and cons

  - by JPro

  Basically I want to setup a replication server for mysql datbase. I am completely new to this concept and appreciate any help pointing me in the right direction. If at all the slave goes down, will it effect the master in anyway? Thanks.

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• BlackBerry - What does getPreferredWidth() and getPreferredHeight() return??

  - by tek3

  Hi all, I am not getting clear about the concept of getPreferredWidth() and getPreferredHeight() methods. What do they return means on what what basis the values are returned.?? What is difference between getWidth() and getPreferredWidth()??? Thank you..

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• Resources how to architect a iPhone application?

  - by Frank Martin

  What resources can you recommend for learning how to architect a iPhone application? Background of the question is that most of the resources explain the usage of a single class or concept (and i appreciate that a lot to learn something about the specific topic) but as far as i can see they lack unfortunately to describe how to put things together for typical real world applications.

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• C# can't cast bool to int

  - by Svetlozar Angelov

  We all know that in C# we can't cast bool to int. I wanted to see what is the binary representation of true with bitmask, but I can't use (bool & int).. I think the problem is the architecture desicion "true is true, not any number != 0" (C++) and I was wondering what the benefits of such an architecture are? What is so bad with the C true/false concept?

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• What are some models that you know of for PHP OOP?

  - by Doug

  I recently learned a lot about MVC model which is a very interesting concept. I would assume there are a lot more models out there, and I thought it would be great for people to share some models. Here's my contribution: MVC Model: http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller

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• Objective C -- passing array literal to a method

  - by morgancodes

  This seems to work (compiler doesn't complain, anyway): float adsr[4] = {0,1.0/PULSE_SPEED, 0,1}; [sequence setBaseADSR:adsr]; but I want to make it more concise and do this: [sequence setBaseADSR:{0,1.0/PULSE_SPEED, 0,1}]; How do I do it? In javascript, I'd call stuff in the brackets an "array literal". Not sure if C languages have the same concept or terminology though.

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