nits: cleanup imports

Author: ochafik

src/main/scala/scalacl/impl/ConcurrentCache.scala

@@ -36,6 +36,13 @@ package scalacl.impl
 class ConcurrentCache[K, V <: AnyRef] {
   private val map = new java.util.concurrent.ConcurrentHashMap[K, V]
 
+  /**
+   * Since the map is not synchronized, we may be creating the value
+   * with {@code initialValue} concurrently with other threads.
+   * When inserting in the {@code ConcurrentHashMap}, only one
+   * initial value will be effectively inserted, the other values will
+   * be discarded.
+   */
   def apply(key: K, discardValue: V => Unit)(initialValue: => V) = {
     val value = map.get(key)
     if (value != null) {
@@ -46,6 +53,7 @@ class ConcurrentCache[K, V <: AnyRef] {
       if (oldValue eq null) {
         newValue
       } else {
+        // A concurrent insertion was quicker than us: discard our new value.
         discardValue(newValue)
         oldValue
       }
@@ -64,4 +72,4 @@ class ConcurrentCache[K, V <: AnyRef] {
       }
     }
   }
-}
+}

src/main/scala/scalacl/impl/KernelMacros.scala

@@ -33,7 +33,6 @@ package scalacl.impl
 import scala.reflect
 import scalaxy.streams.Streams
 import scalaxy.streams.WithMacroContext
-// import scalaxy.components.WithMacroContext
 
 import language.experimental.macros
 

src/main/scala/scalacl/impl/KernelSymbolsAnalysis.scala

@@ -33,13 +33,10 @@ package impl
 
 import scala.language.reflectiveCalls
 
-// import scalaxy.components.CommonScalaNames
-// import scalaxy.components.MiscMatchers
 
 trait KernelSymbolsAnalysis
     extends CommonScalaNames
     with CodeConversionResults
-    // with MiscMatchers
     with SymbolKinds
     with SymbolExtensions {
   val global: reflect.api.Universe

src/main/scala/scalacl/impl/OpenCLCodeFlattening.scala

@@ -44,8 +44,6 @@ import scala.reflect.NameTransformer.{ encode, decode }
 import scala.reflect.api.Universe
 
 trait OpenCLCodeFlattening
-    // extends TreeBuilders
-    // with MiscMatchers
     extends TupleAnalysis
     with CommonScalaNames
     with WhileLoops

src/main/scala/scalacl/impl/OpenCLConverter.scala

@@ -31,16 +31,13 @@
 package scalacl
 package impl
 
-// import scalaxy.components.CommonScalaNames
-// import scalacl.impl.FlatCode
 import scalacl.impl.FlatCodes._
 import scalaxy.streams.Streams
 
 import scala.reflect.NameTransformer
 
 trait OpenCLConverter
     extends OpenCLCodeFlattening
-    // with CommonScalaNames
     with Streams
     with KernelSymbolsAnalysis {
   val global: reflect.api.Universe

src/main/scala/scalacl/impl/SymbolExtensions.scala

@@ -33,8 +33,6 @@ package impl
 
 import scala.language.implicitConversions
 
-// import scalaxy.components.CommonScalaNames
-// import scalaxy.components.MiscMatchers
 
 trait SymbolExtensions {
   val global: reflect.api.Universe

src/main/scala/scalacl/impl/SymbolKinds.scala

@@ -31,8 +31,6 @@
 package scalacl
 package impl
 
-// import scalaxy.components.Tuploids
-// import scalaxy.components.CommonScalaNames
 import scalaxy.streams.TuploidValues
 
 // trait SymbolKinds extends Tuploids with CommonScalaNames {

src/main/scala/scalacl/impl/Vectorization.scala

@@ -37,11 +37,10 @@ import scala.collection.immutable.NumericRange
 import scalacl.CLArray
 import scalacl.CLFilteredArray
 
-//import scalaxy.components.MiscMatchers
 import scalaxy.streams.Streams
 
 trait Vectorization
-    extends CodeGeneration // with MiscMatchers
+    extends CodeGeneration
     with Streams {
   val global: Universe
   import global._

src/main/scala/scalacl/impl/conversion/CodeConversion.scala

@@ -29,9 +29,7 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 package scalacl.impl
-// import scalacl.impl.FlatCode
 import scalacl.impl.FlatCodes._
-// import scalaxy.components.StreamTransformers
 import scalaxy.streams.StreamTransforms
 
 import scalacl.CLArray
@@ -43,7 +41,6 @@ import scala.util.matching.Regex.quoteReplacement
 
 trait CodeConversion
     extends OpenCLConverter
-    // with StreamTransformers
     with StreamTransforms
     with CodeConversionResults
     with UniverseCasts {

src/main/scala/scalacl/impl/conversion/CodeConversionResults.scala

@@ -29,7 +29,6 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 package scalacl.impl
-// import scalacl.impl.FlatCode
 import scalacl.impl.FlatCodes._
 
 import scalacl.CLArray