1 files changed, 9 insertions, 1 deletions
diff --git a/puzzle.cpp b/puzzle.cpp
index 461549b..947e7ba 100644
--- a/puzzle.cpp
+++ b/puzzle.cpp
@@ -17,7 +17,7 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
- * $Id: puzzle.cpp 108 2008-01-06 16:01:26Z tom $
+ * $Id: puzzle.cpp 109 2008-01-06 19:43:20Z tom $
  */
 
 #include "puzzle.h"
@@ -247,6 +247,14 @@ unsigned int Puzzle::numbers_count(Pos pos)
   return count[pos];
 }
 
+/** Is this number in this cell a possible number? */
+bool Puzzle::possible_number(Pos pos, unsigned int number)
+{
+  assert(pos <= Pos::last());
+  assert(0 <= number && number <= DIM);
+  return numbers[pos][number];
+}
+
 /** Compute all possible numbers for this cell. */
 void Puzzle::compute_numbers(Pos pos)
 {