1 files changed, 18 insertions, 0 deletions
diff --git a/interval.go b/interval.go
new file mode 100644
index 0000000..5f44f51
--- /dev/null
+++ b/interval.go
@@ -0,0 +1,18 @@
+package main
+
+type Interval struct {
+  Min float64
+  Max float64
+}
+
+func (i Interval) Size() float64 {
+  return i.Max - i.Min;
+}
+
+func (i Interval) Include(x float64) bool {
+  return i.Min <= x && x <= i.Max;
+}
+
+func (i Interval) Surround(x float64) bool {
+  return i.Min < x && x < i.Max;
+}