From 36ad96d129b3ae46f745208d0070349035436cff Mon Sep 17 00:00:00 2001
From: Roman Galochkin <roman.redrat@gmail.com>
Date: Fri, 21 Feb 2020 15:29:25 +0300
Subject: [PATCH] Step 2

---
 src/utility/lib/CDFunctor.re | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/utility/lib/CDFunctor.re b/src/utility/lib/CDFunctor.re
index c6b823dd..6e1a3719 100644
--- a/src/utility/lib/CDFunctor.re
+++ b/src/utility/lib/CDFunctor.re
@@ -1,7 +1,15 @@
 module type Config = {let shape: DistributionTypes.xyShape;};
 
+exception ShapeWrong(string);
+
 module Make = (Config: Config) => {
   let validateHasLength = (): bool => Array.length(Config.shape.xs) > 0;
   let validateSize = (): bool =>
     Array.length(Config.shape.xs) == Array.length(Config.shape.ys);
+  if (!validateHasLength()) {
+    raise(ShapeWrong("You need at least one element."));
+  };
+  if (!validateSize()) {
+    raise(ShapeWrong("Arrays of \"xs\" and \"ys\" have different sizes."));
+  };
 };