1 files changed, 28 insertions, 0 deletions
diff --git a/src/util/box_indicator.cc b/src/util/box_indicator.cc
new file mode 100644
index 0000000..4f68f91
--- /dev/null
+++ b/src/util/box_indicator.cc
@@ -0,0 +1,28 @@
+#include "box_indicator.h"
+
+namespace life {
+namespace util {
+
+BoxIndicator::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::BoxIndicator(const std::size_t size_x, const std::size_t size_y):
+	BoxIndicator(0, 0, size_x, size_y) { }
+
+bool BoxIndicator::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_;
+}
+
+}
+}