2 files changed, 66 insertions, 0 deletions
diff --git a/src/util/box_indicator.h b/src/util/box_indicator.h
new file mode 100644
index 0000000..c0493c7
--- /dev/null
+++ b/src/util/box_indicator.h
@@ -0,0 +1,40 @@
+#ifndef LIFE_SRC_UTIL_BOX_INDICATOR_
+#define LIFE_SRC_UTIL_BOX_INDICATOR_
+
+namespace life {
+namespace util {
+
+class BoxIndicator {
+	public:
+	   	BoxIndicator(
+			const std::size_t offset_x,
+			const std::size_t offset_y,
+			const std::size_t size_x,
+			const std::size_t size_y):
+			a_x_{offset_x},
+			a_y_{offset_y},
+			b_x_{a_x_ + size_x},
+			b_y_{a_y_ + size_y} { }
+
+	   	BoxIndicator(const std::size_t size_x, const std::size_t size_y):
+			BoxIndicator(0, 0, size_x, size_y) { }
+
+		bool operator()(const std::size_t x, const std::size_t y) const {
+			return x >= this->a_x_
+			    && x <  this->b_x_
+			    && y >= this->a_y_
+			    && y <  this->b_y_;
+		}
+
+	protected:
+		const std::size_t a_x_;
+		const std::size_t a_y_;
+		const std::size_t b_x_;
+		const std::size_t b_y_;
+
+};
+
+}
+}
+
+#endif  // LIFE_SRC_UTIL_BOX_INDICATOR_
diff --git a/src/util/box_traverser.h b/src/util/box_traverser.h
new file mode 100644
index 0000000..cb7dfeb
--- /dev/null
+++ b/src/util/box_traverser.h
@@ -0,0 +1,26 @@
+#ifndef LIFE_SRC_UTIL_BOX_TRAVERSER_
+#define LIFE_SRC_UTIL_BOX_TRAVERSER_
+
+#include <functional>
+
+#include "box_indicator.h"
+
+namespace life {
+namespace util {
+
+struct BoxTraverser : public BoxIndicator {
+	using BoxIndicator::BoxIndicator;
+
+	void for_each(const std::function<void(std::size_t, std::size_t)> f) const {
+		for ( std::size_t x = this->a_x_; x < this->b_x_; x++ ) {
+			for ( std::size_t y = this->a_y_; y < this->b_y_; y++ ) {
+				f(x, y);
+			}
+		}
+	}
+};
+
+}
+}
+
+#endif  // LIFE_SRC_UTIL_BOX_TRAVERSER_