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• Ternary Operator or If Expression?

  - by kunjaan

  When is a good design decision to use the Ternary Operator over if then else clause? Are there any efficiency hit? Do they get compiled to the same code? Do you think one is more readable than the other in some cases?

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• Difference in Django object creation call

  - by PhilGo20

  I'd like to know if there's a difference between the following two calls to create an object in Django Animal.objects.create(name="cat", sound="meow") and Animal(name="cat", sound="meow") I see both in test cases and I want to make sure I am not missing something. thanks

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• using regular expression in Java

  - by Mrityunjay

  Hi, i need to check a string that should contain only ABCDEFG characters, in any sequence and with only 7 characters. Please let me know the correct way of using regular expression. as corrently i am using String abs = "ABPID"; if(!Pattern.matches("[[ABCDEFG]", abs)) System.out.println("Error"); i am using the following code which works when i use the String abcdefg but for other cases it fails. please help me out.

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• Why increased pipeline depth does not always mean increased throughput?

  - by worlds-apart89

  This is perhaps more of a discussion question, but I thought stackoverflow could be the right place to ask it. I am studying the concept of instruction pipelining. I have been taught that a pipeline's instruction throughput is increased once the number of pipeline stages is increased, but in some cases, throughput might not change. Under what conditions, does this happen? I am thinking stalling and branching could be the answer to the question, but I wonder if I am missing something crucial.

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• Checking ActiveRecord Associations in RSpec.

  - by alokswain

  I am learning how to write test cases using Rspec. I have a simple Post Comments Scaffold where a Post can have many Comments. I am testing this using Rspec. How should i go about checking for Post :has_many :comments. Should I stub Post.comments method and then check this with by returning a mock object of array of comment objects? Is testing for AR associations really required ?

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• How to paints a transparent circle like using CGContextClearRect to draw a transparent rectangle

  - by user177946

  Hello All, Do anyone know how I can draw a transparent circle on a CALayer just like using CGContextClearRect to draw a transparent rectangle? My requirements is that I need to draw a mask on a picture, in some cases, I need to erase it, but CGContextClearRect only allow to draw a rectangle, I wonder if there is another way to do the same thing and draw a tranparent circle. Regards, Anto

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• Replace {tag} with a value or completely remove {any-tag}

  - by HasanGursoy

  I've designed a multilingual web site and some values in database have a tag which will be replaced with it's language value, remove tags brackets ( in case {} ) or removed completely. There are two cases: Remove brackets: value {mm} >> value mm Remove completely: value {mm} >> value Also {tag} could be any length and can contain - Can anybody help me with regex?

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• Get particular row as series from pandas dataframe

  - by Pratyush

  How do we get a particular filtered row as series? Example dataframe: >>> df = pd.DataFrame({'date': [20130101, 20130101, 20130102], 'location': ['a', 'a', 'c']}) >>> df date location 0 20130101 a 1 20130101 a 2 20130102 c I need to select the row where location is c as a series. I tried: row = df[df["location"] == "c"].head(1) # gives a dataframe row = df.ix[df["location"] == "c"] # also gives a dataframe with single row In either cases I can't the row as series.

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• Back button of Navigation Controller does not work!

  - by JosephH

  For some reason, if I try to go back to the main menu using the back button on the upper left corner, only the title returns to the previous menu, but not the view controller. View controller would return to the previous menu only if I explicitly call popViewControllerAnimated using some other button. Is there anyway to solve this? I think I've coded something wrong. Tried googling but couldn't find any cases like mine.

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• Fortran: output format dependent on a variable

  - by Flux Capacitor

  I would like to have a FORTRAN write statement formatted to depend on some variable. For example, I could write: write(*,'(3f15.3,3f9.2)') x,y,z,(var(i),i=1,nvari) where nvari = 3 But, what if, in some cases, I actually have 4 variables (i.e. nvari = 4) I would like to write something like this: write(*,'(3f15.3,nvari(f9.2))') x,y,z,(var(i),i=1,nvari) Now, nvari can be anything and the output will work as I like. How can I make something like this work?

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• Should I create private static final String = "Some exception message" or leave it inside the code?

  - by Artic

  Should I create private static final String = "Some exception message" or leave it inside the code? Is there any performance issues? I have a lot of exception cases. Texts are mostly different in any particular case. Wary about performance and memory issues

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• Are weekly reports necessary?

  - by Dbger

  At the times that we didn't use Scrum, we had weekly status meeting and technical discussion; And now after we adopt Scrum, we have daily stand up meeting. But for both cases, weekly reports are always a necessity, although I don't see much value of doing this in our development team. What do you think of weekly report? what benefit that you got from it if your like it?

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• Should Python import statements always be at the top of a module?

  - by Adam J. Forster

  PEP 08 states: Imports are always put at the top of the file, just after any module comments and docstrings, and before module globals and constants. However if the class/method/function that I am importing is only used in rare cases, surely it is more efficient to do the import when it is needed? Isn't this: class SomeClass(object): def not_often_called(self) from datetime import datetime self.datetime = datetime.now() more efficient than this? from datetime import datetime class SomeClass(object): def not_often_called(self) self.datetime = datetime.now()

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• JAVE function call form JSP page is not returning value

  - by Satyendra

  I am calling a java function from JSP page which returns file name after creationg a XML file. In some cases where size of file is large(Java function execution takes much time due to large data) it is returning blank where as XML file is genertaed after some time. Can any one help me to get the file name in this case so that user can know the generated file name.

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• How to restrict code from developers

  - by Kelvin

  My company is planning in hiring outsourcers to work for us, but concerned to give whole existing code to outside world. What is the proper way to deal with security of sharing code in such cases? Is it possible to restrict part of code for developers? So each of them could work on their project without having access to whole repository. P.S. The code we have is very integrated, and its hard to extract "one module", each module can use files from different locations. Thanks in advance

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• polymorphism and interfaces

  - by mixm

  if i have two classes x and y, both extend class w. and x implementing interface z. if i have methods doSomething(w object) and doSomething(x object), what would happen if i call doSomething(x)? edit: im implementing this on java, more specifically on android. im asking this because some classes which implement a specific interface mostly does the same thing when doSomething() is called. but there are special cases which i would like to single out.

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• nhibernate intercept select query

  - by mjmcloug

  Hey, I'm looking at the nhibernate interceptor. It seems to be able to intercept save, update and delete queries but is there anyway I can intercept a select query. The problem I have is that I automatically want to append some additional sql filters to the executing sql statement in certain cases. Any thoughts Thanks Mat

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• For distributed applications, which to use, ASIO vs. MPI?

  - by Rhubarb

  I am a bit confused about this. If you're building a distributed application, which in some cases may perform parallel operations (although not necessarily mathematical), should you use ASIO or something like MPI? I take it MPI is a higher level than ASIO, but it's not clear where in the stack one would begin.

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• Is it possible to simulate TMenuBreak functionality with Dev Express TdxBarSubItems?

  - by mcmar

  In my application I'm dynamically adding new TdxBarSubItems based off of a SQL query. In some cases the result set is rather large so the menu fills the entire screen and sometimes has a down arrow to scroll the list. In a previous version of the code before switching to Dev Express, I was able to add TMenuBreak objects to make the list divide into columns. Is there a way to do this with Dev Express components?

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• If as assert fails, is there a bug?

  - by RichAmberale

  I've always followed the logic: if assert fails, then there is a bug. Root cause could either be: Assert itself is invalid (bug) There is a programming error (bug) (no other options) I.E. Are there any other conclusions one could come to? Are there cases where an assert would fail and there is no bug?

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• What is difference between this two C# methods

  - by RICH KID SMART KID

  What is the difference between these two cases. Firstly, if I open the connection and pass it into my method as a parameter, compared to opening the connection directly in the method? cnn.open() func(cnn,param1,param2); vs func(cnn, param1,param2) { cnn.open(); //open connection here }

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• What's the difference between explicit and implicit assignment in C++

  - by Jake Petroules

  int value = 5; // this type of assignment is called an explicit assignment int value(5); // this type of assignment is called an implicit assignment What is the difference between those, if any, and in what cases do explicit and implicit assignment differ and how?

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• Reopening serial port fails if not closed properly with CloseHandle

  - by superg

  I am working with USB device on Windows that is seen as a virtual serial port. I can communicate with the device using CreateFile and ReadFile functions, but in some cases my application does not call CloseHandle (when my application in development crashes). After that all calls to CreateFile fail (ERROR_ACCESS_DENIED), and the only solution is to log in to my computer again. Is there any way to force closing the open handle (or reopening) programmatically?

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• Why do some people prefer "T const&" over "const T&"?

  - by Michael Aaron Safyan

  So, I realize that const T& and T const& are identical and both mean a reference to a const T. In both cases, the reference is also constant (references cannot be reassigned, unlike pointers). I've observed, in my somewhat limited experience, that most C++ programmers use const T&, but I have come across a few people who use T const&. Is this just a personal preference? Why is one chosen over the other?

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• Why should I use "Web 2.0"-style URLs?

  - by hydrapheetz

  In short, why use something like http://stackoverflow.com/badges/6/supporter instead of something "simpler" (and subjectively, at that) like http://stackoverflow.com/badges/6/. Even on my own site I've just been using /post/6/ to reference posts (by IDs, even though I still store a slug.) Instead of /post/6/small-rant-on-urls, and in some cases, they can get even more absurd, much more so than is really necessary.

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