From 491183c375a9fbb2c8212d818ea0c58916eb63e5 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Mon, 3 Sep 2018 22:35:32 +0200
Subject: [PATCH] rogueviz: std::isnan to prevent errors on some compilers

---
 rogueviz-pentagonal.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rogueviz-pentagonal.cpp b/rogueviz-pentagonal.cpp
index 518cd5fb..80e6a29a 100644
--- a/rogueviz-pentagonal.cpp
+++ b/rogueviz-pentagonal.cpp
@@ -241,8 +241,8 @@ void create_model() {
       testplane[2] = tester * tria[(i+1)%5];
       hyperpoint f = facingdir(testplane);
       // printf("%lf ", f[0]);
-      if(f[0] > -1e-6 || isnan(f[0])) good1++;
-      if(f[0] < +1e-6 || isnan(f[0])) good2++;
+      if(f[0] > -1e-6 || std::isnan(f[0])) good1++;
+      if(f[0] < +1e-6 || std::isnan(f[0])) good2++;
       }
     // printf("\n");
     if(good1 == 5 || good2 == 5) {ctr = h; break; }