Posted
by Jeriho
on Stack Overflow
See other posts from Stack Overflow
or by Jeriho
Published on 2010-04-28T12:50:08Z
Indexed on
2010/04/28
12:53 UTC
Read the original article
Hit count: 260
I want to have classes that can mix only specified traits:
class Peter extends Human with Lawful with Evil
class Mag extends Elf with Chaotic with Neutral
Is in scala a way to do this?
© Stack Overflow or respective owner
as seen on Stack Overflow
- Search for 'Stack Overflow'
I've installed ensime according to the README.md file, however, I get errors in the inferior-ensime-server buffer with the following:
INFO: Fatal Error: scala.tools.nsc.MissingRequirementError: object scala not found.
scala.tools.nsc.MissingRequirementError: object scala not found.
at scala…
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
When I run M-X ensime-disconnect I get the following forever:
string matching regex `\"((?:[^\"\\]|\\.)*)\"' expected but `^@' found
and I see this exception when I use C-c C-c
Uncaught exception in com.ensime.server.SocketHandler@769aba32
java.net.SocketException: Broken pipe
at java…
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
I'm using Scala 2.8.0 and trying to read pipe delimited file like in code snipped below:
object Main {
def main(args: Array[String]) :Unit = {
if (args.length > 0) {
val lines = scala.io.Source.fromPath("QUICK!LRU-2009-11-15.psv")
for (line <-lines)
print(line)
}
…
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
I don't understand why authors said that Code Listing 9.1 from "Programming in Scala" use closure. In chapter 9, they show how to refactor code into more less duplicated form, from this original code:
object FileMatcher {
private def filesHere = (new java.io.File(".")).listFiles
def filesEnding(query:…
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
I am processing a XML document and iterating through nodes. I want to iterate through the nodes and build a new List of some type. How would I do this with Scala:
Here is my XML traverse code:
def findClassRef(xmlNode: Elem) = {
xmlNode\"classDef" foreach { (entry) =>
val name…
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
If I have some traits like:
trait A {...}
trait B extends A{...}
trait C1 extends B{...}
trait C2 extends A{...}
I can write class in two ways (C1 and C2 add same functionality)
class Concrete1 extends B with C1
class Concrete2 extends B with C2
What variant is better(efficient)?
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
I have a trait in Scala that has a single method. Call it Computable and the single method is compute(input: Int): Int. I can't figure out whether I should
Leave it as a standalone trait with a single method.
Inherit from (Int = Int) and rename "compute" to "apply."
Just get rid of Computable…
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
I am writing a functor F which takes function of type void (*func)(T) and func's argument arg. Then functor F calls func with arg. I would like F not to copy arg, just to pass it as reference. But then I cannot simply write "void F(void (*func)(T), T&)" because T could be a reference. So I am…
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
i would like to access, in a trait, the type-parameter of a type-parameter of that trait. without adding this "second-order" type-parameter as another "first-order" parameter to the trait. the following illustrates this problem:
sealed trait A; sealed trait A1 extends A; sealed trait A2 extends A
trait…
>>> More
as seen on Stack Overflow
- Search for 'Stack Overflow'
I program mostly in scala and java, using scalatest in scala and junit for unit testing. I would like to apply the very same tests to several implementations of the same interface/trait. The idea is to verify that the interface contract is enforced and to check Liskov substitution principle.
For…
>>> More
