From 5b96d435c76f962d4f06613b1c7dec1a9a8574a3 Mon Sep 17 00:00:00 2001
From: Robert Maynard <robert.maynard@kitware.com>
Date: Wed, 10 Jun 2015 08:58:11 -0400
Subject: [PATCH] Give IteratorFromArrayPortalValue class a less operator.

This is required so that they can be sorted, which happens when sorting
an ArrayHandleZip.
---
 vtkm/cont/internal/IteratorFromArrayPortal.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/vtkm/cont/internal/IteratorFromArrayPortal.h b/vtkm/cont/internal/IteratorFromArrayPortal.h
index 3d7112125..13a4ce8ee 100644
--- a/vtkm/cont/internal/IteratorFromArrayPortal.h
+++ b/vtkm/cont/internal/IteratorFromArrayPortal.h
@@ -66,6 +66,13 @@ struct IteratorFromArrayPortalValue
     return value;
   }
 
+  VTKM_CONT_EXPORT
+  bool operator<(const ValueType& value) const
+  {
+    return this->Portal.Get(this->Index) < value;
+  }
+
+
   VTKM_CONT_EXPORT
   operator ValueType(void) const
   {
@@ -100,7 +107,7 @@ public:
   operator[](std::size_t idx) const
   {
     return detail::IteratorFromArrayPortalValue<ArrayPortalType>(this->Portal,
-           static_cast<vtkm::Id>(idx) );
+           this->Index + static_cast<vtkm::Id>(idx) );
   }
 
 private: