Threshold worklet is not templated on device adapter.

This should help reduce the amount of code generation, when building the
Threshold worklet for all device adapters.

vtkm/worklet/Threshold.h

@@ -33,7 +33,6 @@
 namespace vtkm {
 namespace worklet {
 
-template <typename DeviceAdapter>
 class Threshold
 {
 public:
@@ -102,10 +101,12 @@ public:
     UnaryPredicate Predicate;
   };
 
-  template <typename CellSetType, typename UnaryPredicate>
+  template <typename CellSetType, typename UnaryPredicate, typename DeviceAdapter>
   vtkm::cont::CellSetPermutation<vtkm::cont::ArrayHandle<vtkm::Id>, CellSetType>
-  Run(const CellSetType &cellSet, const vtkm::cont::Field &field,
-      const UnaryPredicate &predicate)
+  Run(const CellSetType &cellSet,
+      const vtkm::cont::Field &field,
+      const UnaryPredicate &predicate,
+      DeviceAdapter)
   {
     typedef vtkm::cont::CellSetPermutation<vtkm::cont::ArrayHandle<vtkm::Id>,
                                            CellSetType> OutputType;

vtkm/worklet/testing/UnitTestThreshold.cxx

@@ -70,9 +70,11 @@ public:
 
     CellSetType cellset = dataset.GetCellSet(0).CastTo(CellSetType());
 
-    vtkm::worklet::Threshold<DeviceAdapter> threshold;
-    OutCellSetType outCellSet = threshold.Run(cellset, dataset.GetField("pointvar"),
-                                              HasValue(60.1f));
+    vtkm::worklet::Threshold threshold;
+    OutCellSetType outCellSet = threshold.Run(cellset,
+                                              dataset.GetField("pointvar"),
+                                              HasValue(60.1f),
+                                              DeviceAdapter());
     vtkm::cont::Field cellField =
         threshold.ProcessCellField(dataset.GetField("cellvar"));
 
@@ -101,9 +103,11 @@ public:
 
     CellSetType cellset = dataset.GetCellSet(0).CastTo(CellSetType());
 
-    vtkm::worklet::Threshold<DeviceAdapter> threshold;
-    OutCellSetType outCellSet = threshold.Run(cellset, dataset.GetField("pointvar"),
-                                              HasValue(20.1f));
+    vtkm::worklet::Threshold threshold;
+    OutCellSetType outCellSet = threshold.Run(cellset,
+                                              dataset.GetField("pointvar"),
+                                              HasValue(20.1f),
+                                              DeviceAdapter());
     vtkm::cont::Field cellField =
         threshold.ProcessCellField(dataset.GetField("cellvar"));
 
@@ -133,9 +137,11 @@ public:
 
     CellSetType cellset = dataset.GetCellSet(0).CastTo(CellSetType());
 
-    vtkm::worklet::Threshold<DeviceAdapter> threshold;
-    OutCellSetType outCellSet = threshold.Run(cellset, dataset.GetField("cellvar"),
-                                              HasValue(100.1f));
+    vtkm::worklet::Threshold threshold;
+    OutCellSetType outCellSet = threshold.Run(cellset,
+                                              dataset.GetField("cellvar"),
+                                              HasValue(100.1f),
+                                              DeviceAdapter());
     vtkm::cont::Field cellField =
         threshold.ProcessCellField(dataset.GetField("cellvar"));