From 6fba7347a91c9737d5370962c0c0f3b8db22a796 Mon Sep 17 00:00:00 2001
From: Nick <nathompson7@protonmail.com>
Date: Thu, 14 May 2020 14:29:34 -0400
Subject: [PATCH 1/2] Mark pixel destructors as virtual to fix build error.

---
 vtkm/io/PixelTypes.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/vtkm/io/PixelTypes.h b/vtkm/io/PixelTypes.h
index 4b7ee0ab5..8a86d3c8d 100644
--- a/vtkm/io/PixelTypes.h
+++ b/vtkm/io/PixelTypes.h
@@ -111,6 +111,8 @@ public:
   ///
   void FillImageAtIndexWithPixel(unsigned char* imageData, const vtkm::Id index);
 
+  virtual ~BasePixel() = default;
+
 protected:
   /// Takes an input imageData pointer and an index to a location in that dataset
   /// and fills in this->Components correctly using the provided BIT_DEPTH and
@@ -144,6 +146,8 @@ public:
   ComponentType Diff(const Superclass& pixel) const override;
   vtkm::Vec4f_32 ToVec4f() const override;
 
+  virtual ~RGBPixel() = default;
+
 protected:
   void print(std::ostream& os) const override
   {
@@ -179,6 +183,8 @@ public:
   ComponentType Diff(const Superclass& pixel) const override;
   vtkm::Vec4f_32 ToVec4f() const override;
 
+  virtual ~GreyPixel() = default;
+
 protected:
   void print(std::ostream& os) const override { os << "(" << (int)this->Components[0] << ")"; }
 };

From a55596b38c4e003a58589b2b042f96e94d77b618 Mon Sep 17 00:00:00 2001
From: Nick <nathompson7@protonmail.com>
Date: Thu, 14 May 2020 16:10:33 -0400
Subject: [PATCH 2/2] Reorder member functions.

---
 vtkm/io/PixelTypes.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/vtkm/io/PixelTypes.h b/vtkm/io/PixelTypes.h
index 8a86d3c8d..c6a7b9034 100644
--- a/vtkm/io/PixelTypes.h
+++ b/vtkm/io/PixelTypes.h
@@ -88,6 +88,8 @@ public:
     ConstructPixelFromImage(imageData, index);
   }
 
+  virtual ~BasePixel() = default;
+
   /// Calculates this difference between two pixels as a single value.
   ///
   virtual ComponentType Diff(const BaseType& pixel) const = 0;
@@ -111,8 +113,6 @@ public:
   ///
   void FillImageAtIndexWithPixel(unsigned char* imageData, const vtkm::Id index);
 
-  virtual ~BasePixel() = default;
-
 protected:
   /// Takes an input imageData pointer and an index to a location in that dataset
   /// and fills in this->Components correctly using the provided BIT_DEPTH and
@@ -143,11 +143,11 @@ public:
   {
   }
 
+  virtual ~RGBPixel() = default;
+
   ComponentType Diff(const Superclass& pixel) const override;
   vtkm::Vec4f_32 ToVec4f() const override;
 
-  virtual ~RGBPixel() = default;
-
 protected:
   void print(std::ostream& os) const override
   {
@@ -180,11 +180,11 @@ public:
   {
   }
 
+  virtual ~GreyPixel() = default;
+
   ComponentType Diff(const Superclass& pixel) const override;
   vtkm::Vec4f_32 ToVec4f() const override;
 
-  virtual ~GreyPixel() = default;
-
 protected:
   void print(std::ostream& os) const override { os << "(" << (int)this->Components[0] << ")"; }
 };