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author | Aleksandar Prokopec <axel22@gmail.com> | 2012-02-16 13:34:06 +0100 |
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committer | Aleksandar Prokopec <axel22@gmail.com> | 2012-02-16 13:34:06 +0100 |
commit | 53b05bb12f5a7a50448bcac9434389bf95273c45 (patch) | |
tree | d10140f4a3f2ea46dd39b47828c1326e9a61681e /test/pending/run/reify_fors.scala | |
parent | f2ccb43a844e484ae511c8cff3fbf534a0d86ebe (diff) | |
parent | 91148376049a152edec12348ff9b7e9e93e6ebe1 (diff) | |
download | scala-53b05bb12f5a7a50448bcac9434389bf95273c45.tar.gz scala-53b05bb12f5a7a50448bcac9434389bf95273c45.tar.bz2 scala-53b05bb12f5a7a50448bcac9434389bf95273c45.zip |
Merge branch 'master' into execution-context
Conflicts:
src/library/scala/package.scala
Diffstat (limited to 'test/pending/run/reify_fors.scala')
-rw-r--r-- | test/pending/run/reify_fors.scala | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/test/pending/run/reify_fors.scala b/test/pending/run/reify_fors.scala deleted file mode 100644 index f3556514a9..0000000000 --- a/test/pending/run/reify_fors.scala +++ /dev/null @@ -1,107 +0,0 @@ -import scala.tools.nsc.reporters._ -import scala.tools.nsc.Settings -import reflect.runtime.Mirror.ToolBox - -object Test extends App { - val code = scala.reflect.Code.lift{ - object Persons { - /** A list of persons. To create a list, we use Predef.List - * which takes a variable number of arguments and constructs - * a list out of them. - */ - val persons = List( - new Person("Bob", 17), - new Person("John", 40), - new Person("Richard", 68) - ) - - /** A Person class. 'val' constructor parameters become - * public members of the class. - */ - class Person(val name: String, val age: Int) - - /** Return an iterator over persons that are older than 20. - */ - def olderThan20(xs: Seq[Person]): Iterator[String] = - olderThan20(xs.elements) - - /** Return an iterator over persons older than 20, given - * an iterator over persons. - */ - def olderThan20(xs: Iterator[Person]): Iterator[String] = { - - // The first expression is called a 'generator' and makes - // 'p' take values from 'xs'. The second expression is - // called a 'filter' and it is a boolean expression which - // selects only persons older than 20. There can be more than - // one generator and filter. The 'yield' expression is evaluated - // for each 'p' which satisfies the filters and used to assemble - // the resulting iterator - for (p <- xs if p.age > 20) yield p.name - } - } - - /** Some functions over lists of numbers which demonstrate - * the use of for comprehensions. - */ - object Numeric { - - /** Return the divisors of n. */ - def divisors(n: Int): List[Int] = - for (i <- List.range(1, n+1) if n % i == 0) yield i - - /** Is 'n' a prime number? */ - def isPrime(n: Int) = divisors(n).length == 2 - - /** Return pairs of numbers whose sum is prime. */ - def findNums(n: Int): Iterable[(Int, Int)] = { - - // a for comprehension using two generators - for (i <- 1 until n; - j <- 1 until (i-1); - if isPrime(i + j)) yield (i, j) - } - - /** Return the sum of the elements of 'xs'. */ - def sum(xs: List[Double]): Double = - xs.foldLeft(0.0) { (x, y) => x + y } - - /** Return the sum of pairwise product of the two lists. */ - def scalProd(xs: List[Double], ys: List[Double]) = - sum(for((x, y) <- xs zip ys) yield x * y); - - /** Remove duplicate elements in 'xs'. */ - def removeDuplicates[A](xs: List[A]): List[A] = - if (xs.isEmpty) - xs - else - xs.head :: removeDuplicates(for (x <- xs.tail if x != xs.head) yield x) - } - - // import all members of object 'persons' in the current scope - import Persons._ - - print("Persons over 20:") - olderThan20(persons) foreach { x => print(" " + x) } - println - - import Numeric._ - - println("divisors(34) = " + divisors(34)) - - print("findNums(15) =") - findNums(15) foreach { x => print(" " + x) } - println - - val xs = List(3.5, 5.0, 4.5) - println("average(" + xs + ") = " + sum(xs) / xs.length) - - val ys = List(2.0, 1.0, 3.0) - println("scalProd(" + xs + ", " + ys +") = " + scalProd(xs, ys)) - }; - - val reporter = new ConsoleReporter(new Settings) - val toolbox = new ToolBox(reporter) - val ttree = toolbox.typeCheck(code.tree) - toolbox.runExpr(ttree) -} |