From 0e15cb58d3d05a2e8062a6b73aaa14a1960a1eec Mon Sep 17 00:00:00 2001
From: Paul Romano <paul.k.romano@gmail.com>
Date: Wed, 3 Jul 2019 21:59:27 -0500
Subject: [PATCH] Add getter for MaterialFilter::materials_

---
 include/openmc/tallies/filter_material.h | 10 ++++++++--
 src/tallies/filter_material.cpp          |  4 ++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/openmc/tallies/filter_material.h b/include/openmc/tallies/filter_material.h
index 34dffa2b83..97d0b2f8d5 100644
--- a/include/openmc/tallies/filter_material.h
+++ b/include/openmc/tallies/filter_material.h
@@ -27,12 +27,18 @@ public:
   void get_all_bins(const Particle* p, int estimator, FilterMatch& match)
   const override;
 
-  void set_materials(gsl::span<const int32_t> materials);
-
   void to_statepoint(hid_t filter_group) const override;
 
   std::string text_label(int bin) const override;
 
+  // Accessors
+  std::vector<int32_t>& materials() { return materials_; }
+
+  const std::vector<int32_t>& materials() const { return materials_; }
+
+  void set_materials(gsl::span<const int32_t> materials);
+
+private:
   //! The indices of the materials binned by this filter.
   std::vector<int32_t> materials_;
 
diff --git a/src/tallies/filter_material.cpp b/src/tallies/filter_material.cpp
index c9fd644adc..c44ee0d28b 100644
--- a/src/tallies/filter_material.cpp
+++ b/src/tallies/filter_material.cpp
@@ -93,8 +93,8 @@ openmc_material_filter_get_bins(int32_t index, int32_t** bins, size_t* n)
   }
 
   // Output the bins.
-  *bins = filt->materials_.data();
-  *n = filt->materials_.size();
+  *bins = filt->materials().data();
+  *n = filt->materials().size();
   return 0;
 }