X-Git-Url: http://git.scottworley.com/slidingtile/blobdiff_plain/82d6eed523b5c102d826b66e21c03f5577199714..32688d85f745574d7bbf941985234458d2776cce:/sliding_tile_lib.cc

diff --git a/sliding_tile_lib.cc b/sliding_tile_lib.cc
index 4b422c1..a4d522e 100644
--- a/sliding_tile_lib.cc
+++ b/sliding_tile_lib.cc
@@ -1,5 +1,7 @@
 #include "sliding_tile_lib.h"
 
+#include <istream>
+
 signed char adjacent[BOARD_SIZE][5] = {
   1,   4,   -1,  -1,  -1,
   0,   2,   5,   -1,  -1,
@@ -18,3 +20,20 @@ signed char adjacent[BOARD_SIZE][5] = {
   10,  13,  15,  -1,  -1,
   11,  14,  -1,  -1,  -1,
 };
+
+std::istream& operator>>(std::istream& is, Board& board) {
+  for (int i = 0; i < BOARD_SIZE; i++) {
+    if (!is.good()) {
+      is.setstate(std::istream::failbit);
+      break;
+    }
+    if (i > 0 && is.get() != ',') {
+      is.setstate(std::istream::failbit);
+      break;
+    }
+    int numeric;
+    is >> numeric;
+    board[i] = numeric;
+  }
+  return is;
+}