X-Git-Url: http://git.scottworley.com/slidingtile/blobdiff_plain/310a7132ffc617b93969703de7f3bf1c5ea0fa30..f92e9dcac70dc0859e1cf176b84b39c42f677e3e:/sliding_tile_lib.cc?ds=sidebyside

diff --git a/sliding_tile_lib.cc b/sliding_tile_lib.cc
index e4f2f12..5284dab 100644
--- a/sliding_tile_lib.cc
+++ b/sliding_tile_lib.cc
@@ -133,7 +133,7 @@ int Board::distance(const InvertedBoard& invo) const {
   return dist;
 }
 
-std::vector<Step*> Step::successors(std::shared_ptr<Step> shared_this) {
+std::vector<Step*> Step::successors(std::shared_ptr<Step> shared_this) const {
   std::vector<Step*> suc;
   signed char hole_pos = board.hole();
   for (int i = 0; adjacent[hole_pos][i] > 0; i++) {