BAN: implement exchange sort and test for it

BAN/include/BAN/Sort.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <BAN/Swap.h>
+#include <BAN/Traits.h>
+
+namespace BAN
+{
+
+	template<typename It, typename Comp = less<typename It::value_type>>
+	void sort_exchange(It begin, It end, Comp comp = {})
+	{
+		for (It lhs = begin; lhs != end; ++lhs)
+			for (It rhs = lhs; ++rhs != end;)
+				if (!comp(*lhs, *rhs))
+					swap(*lhs, *rhs);
+	}
+
+
+
+}