diff --git a/maths.hpp b/maths.hpp
index 83ef32d1..452f35c0 100644
--- a/maths.hpp
+++ b/maths.hpp
@@ -192,6 +192,13 @@ namespace cruft {
     }
 
 
+    //-------------------------------------------------------------------------
+    template <typename ValueT>
+    constexpr auto
+    pow2 [[gnu::const]] (ValueT const &val)
+    { return val * val; }
+
+
     //-------------------------------------------------------------------------
     template <typename T>
     constexpr