diff -r ce66d7e374bf -r 42bb29924218 sources/range.h
--- a/sources/range.h	Wed Jul 20 22:56:16 2016 +0300
+++ b/sources/range.h	Fri Jul 22 17:50:00 2016 +0300
@@ -108,6 +108,11 @@
 		return m_b;
 	}
 
+	T step() const
+	{
+		return m_step;
+	}
+
 	void check_bounds()
 	{
 		if (m_b < m_a)