From 4d5b8732c97c73ce7cf04e6641a239ceb0447d8d Mon Sep 17 00:00:00 2001
From: Franklin Wei <me@fwei.tk>
Date: Sun, 3 Feb 2019 17:51:06 -0500
Subject: Add circular arc and spiral curves

---
 vec3.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'vec3.h')

diff --git a/vec3.h b/vec3.h
index 1f01098..abfc6c3 100644
--- a/vec3.h
+++ b/vec3.h
@@ -1,3 +1,5 @@
+#ifndef VEC3_H
+#define VEC3_H
 #include <iostream>
 class vec3 {
     public:
@@ -25,3 +27,4 @@ class vec3 {
 };
 
 std::ostream &operator<<(std::ostream &output, const vec3 &v);
+#endif
-- 
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