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• Performing complicated XPath queries in Scala

  - by Ken Bloom

  What's the simplest API to use in scala to perform the following XPath queries on a document? //s:Annotation[@type='attitude']/s:Content/s:Parameter[@role='type' and not(text())] //s:Annotation[s:Content/s:Parameter[@role='id' and not(text())]]/@type The only documentation I can find on Scala's XML libraries has no information on performing…

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• Issuing native system commands in Scala

  - by Tony

  I want to issue a native system command from a Scala program, and perhaps trap the output. ("ls" comes to mind. There may be other ways to get directory information without issuing the command, but that's beside the point of my question.) It would correspond to os.system(...) in Python. I've looked in "Programming in Scala". I've looked in…

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• Inheritance and type parameters of Traversable

  - by Jesper

  I'm studying the source code of the Scala 2.8 collection classes. I have questions about the hierarchy of scala.collection.Traversable. Look at the following declarations: package scala.collection trait Traversable[+A] extends TraversableLike[A, Traversable[A]] with GenericTraversableTemplate[A, Traversable] trait…

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• When is @uncheckedVariance needed in Scala, and why is it used in GenericTraversableTemplate?

  - by retronym

  @uncheckedVariance can be used to bridge the gap between Scala's declaration site variance annotations and Java's invariant generics. scala import java.util.Comparator import java.util.Comparator scala trait Foo[T] extends Comparator[T] defined trait Foo scala trait Foo[-T] extends Comparator[T] :5: error: …

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• Scala's lazy arguments: How do they work?

  - by python dude

  In the file Parsers.scala (Scala 2.9.1) from the parser combinators library I seem to have come across a lesser known Scala feature called "lazy arguments". Here's an example: def ~ [U](q: => Parser[U]): Parser[~[T, U]] = { lazy val p = q // lazy argument (for(a <- this; b <- p) yield new ~(a,b)).named("~") } …

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• How do I write recursive anonymous functions?

  - by James T Kirk

  In my continued effort to learn scala, I'm working through 'Scala by example' by Odersky and on the chapter on first class functions, the section on anonymous function avoids a situation of recursive anonymous function. I have a solution that seems to work. I'm curious if there is a better answer out there. From the pdf:…

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• Self-modify the classpath within a Scala script?

  - by Alex R

  I'm trying to replace a bunch of Linux shell scripts with Scala scripts. One of the remaining challenges is how to scan an entire directory of JARs and place them into the classpath. Currently this is done in the shell script prior to invoking the scala JVM. I'd like to eliminate the shell script completely. Is there an…

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• what means "not enclossing class" hier in scala

  - by echo

  Hoi ,i am learning scala and trying to translate some java code to scala. Here are some of the code below in java that I want to translate public class Note{ protected void addNote(Meeting n) { //add n to a list } } public abstract class Meeting{ public Meeting(String name,Note note){ …

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• Changing XML Namespace with Scala

  - by toddk

  I am using scala to load a XML file from file via the scala.xml.XML.loadFile() method. The documents I'm working with have namespaces already defined and I wish to change the namespace to something else using scala. For example, a document has a xmlns of "http://foo.com/a" with a prefix of "a" - I would like to change…

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• Visual Assist Macros

  - by ufukgun

  Do you have any visual assist macros that you write and you want to share? it can be very useful on coding.. people who use Visual-Assist knows that..

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• Awesome Visual Studio Macros

  - by BBetances

  For a small community discussion, what are some essential Visual Studio macros you guys use? I just started learning about them, and want to hear what some of you guys can't live without.

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• Current Line For Visual Studio Macros

  - by Vadim

  How can I read text of a current line (where cursor is situated) from Macros? I'm going to use such a fucntion: Public Sub AddTextToChangeLogFile() Dim textOnACurrentLine As ??? textOnACurrentLine = ??? If textOnACurrentLine.Text <> String.Empty Then Dim sw As New…

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• Python Macros: Use Cases?

  - by Rick Copeland

  If Python had a macro facility similar to Lisp/Scheme (something like MetaPython), how would you use it? If you are a Lisp/Scheme programmer, what sorts of things do you use macros for (other than things that have a clear syntactic parallel in Python such as a while loop)?

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• Are C style macros available in Python?

  - by Dragos Toader

  In C there's a way to #define macros: #define OBJWITHSIZE(_x) (sizeof _x)/(sizeof _x[0]) Is there a way to do this in Python?

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• Macros to set and clear bits

  - by volting

  Im trying to write a few simple macros to simplify the task of setting and clearing bits which should be a simple task however I cant seem to get them to work correctly. #define SET_BIT(p,n) ((p) |= (1 << (n))) #define CLR_BIT(p,n) ((p) &= (~(1) << (n)))

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• Checking type sizes in C with macros.

  - by Seisatsu

  I'm writing a program that needs to have unsigned types with definite sizes. I need a uint8, uint16, uint32, and uint64, and I need them defined in types.h, in a way that they will always be defined correctly regardless of platform. My question is, how can I check the sizes of different types…

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• Optional Parameters with C++ Macros

  - by Cenoc

  Hey there, Is there some way of getting optional parameters with C++ Macros? Some sort of overloading would be nice too. It doesnt seem as if there is? I couldnt find any method anyway. Thanks in advance!

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• Difference between macros and functions in C in relation to instruction memory and speed

  - by DAHANS

  To my understanding the difference between a macro and a function is, that a macro-call will be replaced by the instruction in the definition, and a function does the whole push, branch and pop -thing. Is this right, or have I understand something wrong? Additionally, if this is right, it…

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• Typesafe obtient 14m de $ pour pousser Scala en avant, un financement destiné à accroître sa popularité

  Typesafe obtient 14m de $ pour pousser Scala en avant Un financement destiné à accroître sa popularité Avec l'aide de fonds nouvellement obtenus de Shasta Ventures et Juniper Networks, Typesafe va intensifier la promotion du langage de programmation Scala dans le monde de l'entreprise. …

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• Scala parser combinator runs out of memory

  - by user3217013

  I wrote the following parser in Scala using the parser combinators: import scala.util.parsing.combinator._ import scala.collection.Map import scala.io.StdIn object Keywords { val Define = "define" val True = "true" val False = "false" val If = "if" val Then =…

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• professor of Java not knowing Groovy or Scala, normal or abnormal

  - by user311884

  i went to a prestigeous software conference (as dominant in its own field as MS in general), one main speaker is a professor of computer science who has been teaching Java for 20 years. During question session, he seems never heard of Groovy or Scala.... He is from a decent…

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• scala integer weirdness

  - by williamstw

  Suppose you inadvertently use Integer instead of Int, as in this code: import scala.collection.mutable.Map val contributors = Map[String,Integer]() val count = contributors.getOrElseUpdate("john",0) contributors.put("john",count+1) println(contributors) Compiler…

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• How do you unit test Scala in Eclipse?

  - by Jørgen Fogh

  I am learning Scala and would like to set up integrated unit testing in Eclipse. As far as I can tell from googling, ScalaTest is the way to go, possibly in combination with JUnit. What are your experiences with unit testing Scala in Eclipse? Should I use the JUnit…

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• ADTs in F# and Scala

  - by anonymous

  What are the key differences between ADTs in F# and Scala? Is there anything that F#'s ADTs can do but Scala's ADTs cannot (and vice versa)?

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• Can you do Logic Programming in Scala?

  - by Alex R

  I read somewhere that Pattern Matching like that supported by the match/case feature in Scala was actually borrowed from Logic languages like Prolog. Can you use Scala to elegantly solve problems like the Connected Graph problem? e.g.…

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