1 files changed, 33 insertions, 0 deletions
diff --git a/layout/math.go b/layout/math.go
new file mode 100644
index 0000000..f09cf00
--- /dev/null
+++ b/layout/math.go
@@ -0,0 +1,33 @@
+package layout
+
+type number interface {
+	complex | float | integer
+}
+
+type complex interface {
+	~complex64 | ~complex128
+}
+
+type float interface {
+	~float32 | ~float64
+}
+
+type integer interface {
+	signed | unsigned
+}
+
+type signed interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64
+}
+
+type unsigned interface {
+	~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64
+}
+
+func sum[N number](ns []N) N {
+	var n N
+	for i := range ns {
+		n += ns[i]
+	}
+	return n
+}