Better separation between Layout and Mux

1 files changed, 7 insertions, 2 deletions

diff --git a/layout/split.go b/layout/split.go
index 4bf00a7..fb6d36e 100644
--- a/layout/split.go
+++ b/layout/split.go
@@ -1,13 +1,18 @@
 package layout
 
+import "fmt"
+
 // SplitFunc represents a way to split a space among a number of elements.
-// The space of the returned slice must be equal to the number of elements.
+// The length of the returned slice must be equal to the number of elements.
 // The sum of all elements of the returned slice must be eqal to the space.
 type SplitFunc func(elements int, space int) []int
 
-// EvenSplit implements SplitFunc to split a space (almost) evenly among the elements.
+// EvenSplit is a SplitFunc used to split a space (almost) evenly among the elements.
 // It is almost evenly because width may not be divisible by elements.
 func EvenSplit(elements int, width int) []int {
+	if elements <= 0 {
+		panic(fmt.Errorf("EvenSplit: elements must be greater than 0"))
+	}
 	ret := make([]int, 0, elements)
 	for elements > 0 {
 		v := width / elements