elapsed added

benchmark/elapsed.go

@@ -0,0 +1,13 @@
+package benchmark
+
+import (
+	"fmt"
+	"time"
+)
+
+func Elapsed(what string) func() {
+	start := time.Now()
+	return func() {
+		fmt.Printf("%s: %v", what, time.Since(start))
+	}
+}