From 2459b29da325d38d9aebf60faab1cf45ac9d16c9 Mon Sep 17 00:00:00 2001
From: Yann Kempf <yann.kempf@helsinki.fi>
Date: Mon, 10 May 2021 15:26:13 +0300
Subject: [PATCH] Replace invalid loval id value -1 -> -stencil width.

---
 fsgrid.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fsgrid.hpp b/fsgrid.hpp
index 526d0b1..7265238 100644
--- a/fsgrid.hpp
+++ b/fsgrid.hpp
@@ -382,7 +382,7 @@ template <typename T, int stencil> class FsGrid {
       }
 
       /*! Transform global cell coordinates into the local domain.
-       * If the coordinates are out of bounds, (-1,-1,-1) is returned.
+       * If the coordinates are out of bounds, (-stencil,-stencil,-stencil) is returned.
        * \param x The cell's global x coordinate
        * \param y The cell's global y coordinate
        * \param z The cell's global z coordinate
@@ -395,7 +395,7 @@ template <typename T, int stencil> class FsGrid {
 
          if(retval[0] > localSize[0] || retval[1] > localSize[1] || retval[2] > localSize[2]
                || retval[0] < 0 || retval[1] < 0 || retval[2] < 0) {
-            return {-1,-1,-1};
+            return {-stencil,-stencil,-stencil};
          }
 
          return retval;