A bit of late night work designing the little iterators.

matrix.hpp

@@ -2,16 +2,43 @@
 #include <vector>
 #include <string>
 
-typedef std::vector<int> MatrixRow;
-typedef std::vector<MatrixRow> Matrix;
+namespace matrix {
 
-/*
- * Just a quick thing to reset a matrix to a value.
- */
-inline void matrix_assign(Matrix &out, int new_value) {
-  for(auto &row : out) {
-    row.assign(row.size(), new_value);
+  typedef std::vector<int> Row;
+  typedef std::vector<Row> Matrix;
+
+  struct each_cell {
+    size_t x = ~0;
+    size_t y = ~0;
+    size_t width = 0;
+    size_t height = 0;
+    int cell = 0;
+
+    each_cell(Matrix &mat);
+    bool next();
+  };
+
+  struct each_row {
+    Matrix &$mat;
+    size_t x = ~0;
+    size_t y = ~0;
+    size_t width = 0;
+    size_t height = 0;
+    int cell = 0;
+    bool row = false;
+
+    each_row(Matrix &mat);
+    bool next();
+  };
+
+  /*
+   * Just a quick thing to reset a matrix to a value.
+   */
+  inline void assign(Matrix &out, int new_value) {
+    for(auto &row : out) {
+      row.assign(row.size(), new_value);
+    }
   }
-}
 
-void matrix_dump(const std::string &msg, Matrix &map, int show_x=-1, int show_y=-1);
+  void dump(const std::string &msg, Matrix &map, int show_x=-1, int show_y=-1);
+}