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author | Samuel Gruetter <samuel.gruetter@epfl.ch> | 2014-03-12 22:44:33 +0100 |
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committer | Samuel Gruetter <samuel.gruetter@epfl.ch> | 2014-03-12 22:44:33 +0100 |
commit | 9ef5f6817688f814a3450126aa7383b0928e80a0 (patch) | |
tree | 5727a2f7f7fd665cefdb312af2785c692f04377c /tests/untried/pos/depmet_implicit_oopsla_zipwith.scala | |
parent | 194be919664447631ba55446eb4874979c908d27 (diff) | |
download | dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.tar.gz dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.tar.bz2 dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.zip |
add tests from scala/test/files/{pos,neg}
with explicit Unit return type
Diffstat (limited to 'tests/untried/pos/depmet_implicit_oopsla_zipwith.scala')
-rw-r--r-- | tests/untried/pos/depmet_implicit_oopsla_zipwith.scala | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tests/untried/pos/depmet_implicit_oopsla_zipwith.scala b/tests/untried/pos/depmet_implicit_oopsla_zipwith.scala new file mode 100644 index 000000000..c034e3ef5 --- /dev/null +++ b/tests/untried/pos/depmet_implicit_oopsla_zipwith.scala @@ -0,0 +1,44 @@ +case class Zero() +case class Succ[N](x: N) +import Stream.{cons, continually} + +trait ZipWith[N, S] { + type T + + def manyApp: N => Stream[S] => T + def zipWith: N => S => T = n => f => manyApp(n)(continually(f)) +} +object ZipWith { + implicit def ZeroZipWith[S] = new ZipWith[Zero, S] { + type T = Stream[S] + + def manyApp = n => xs => xs + } + + implicit def SuccZipWith[N, S, R](implicit zw: ZipWith[N, R]) = + new ZipWith[Succ[N],S => R] { + type T = Stream[S] => zw.T + + def zapp[A, B](xs: Stream[A => B], ys: Stream[A]): Stream[B] = (xs, ys) match { + case (cons(f, fs), cons(s, ss)) => cons(f(s),zapp(fs, ss)) + case (_, _) => Stream.empty + } + + def manyApp = n => xs => ss => n match { + case Succ(i) => zw.manyApp(i)(zapp(xs, ss)) + } + } +} + +object Test { + def zWith[N, S](n: N, s: S)(implicit zw: ZipWith[N, S]): zw.T = zw.zipWith(n)(s) + + def zipWith0: Stream[Int] = zWith(Zero(),0) + +// (Stream[A]) => java.lang.Object with ZipWith[Zero,B]{type T = Stream[B]}#T +// should normalise to: Stream[A] => Stream[B] + def map[A, B](f: A => B) = zWith(Succ(Zero()),f) + + def zipWith3[A, B, C, D](f: A => B => C => D) = //: Stream[A] => Stream[B] => Stream[C] => Stream[D] = // BUG why do we need a return type? + zWith(Succ(Succ(Succ(Zero()))),f) +} |