First cut of pulling out the relevant parts of my original game to make a little framework.

src/algos/matrix.hpp

@@ -0,0 +1,44 @@
+#pragma once
+#include "algos/shiterator.hpp"
+
+namespace matrix {
+  using Row = shiterator::BaseRow<int>;
+  using Matrix = shiterator::Base<int>;
+
+  using viewport = shiterator::viewport_t<Matrix>;
+  using perimeter = shiterator::perimeter_t<Matrix>;
+
+  using each_cell = shiterator::each_cell_t<Matrix>;
+
+  using each_row = shiterator::each_row_t<Matrix>;
+  using box = shiterator::box_t<Matrix>;
+  using compass = shiterator::compass_t<Matrix>;
+  using circle = shiterator::circle_t<Matrix>;
+  using rectangle = shiterator::rectangle_t<Matrix>;
+  using rando_rect = shiterator::rando_rect_t<Matrix>;
+  using rando_rect = shiterator::rando_rect_t<Matrix>;
+  using rando_box = shiterator::rando_box_t<Matrix>;
+  using line = shiterator::line_t;
+
+  void dump(const std::string &msg, Matrix &map, int show_x=-1, int show_y=-1);
+
+  inline Matrix make(size_t width, size_t height) {
+    return shiterator::make<int>(width, height);
+  }
+
+  inline bool inbounds(Matrix &mat, size_t x, size_t y) {
+    return shiterator::inbounds(mat, x, y);
+  }
+
+  inline size_t width(Matrix &mat) {
+    return shiterator::width(mat);
+  }
+
+  inline size_t height(Matrix &mat) {
+    return shiterator::height(mat);
+  }
+
+  inline void assign(Matrix &out, int new_value) {
+    shiterator::assign(out, new_value);
+  }
+}