From 776303b18df6cbc3a34346da7f349e8ecb4192a3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9ophile=20Bastian?= <contact@tobast.fr>
Date: Thu, 8 Feb 2018 12:22:19 +0100
Subject: [PATCH] Make operator() const for implicit surfaces

---
 Implicit.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Implicit.hpp b/Implicit.hpp
index 9e1a341..02fcae2 100644
--- a/Implicit.hpp
+++ b/Implicit.hpp
@@ -2,5 +2,5 @@
 
 class ImplicitSurface {
     public:
-        virtual double operator() (double x, double y, double z);
+        virtual double operator() (double x, double y, double z) const;
 };