From 8ee0aafb6ef9d74071dfa0a8e6d42cb99893205b Mon Sep 17 00:00:00 2001
From: cignoni <paolo.cignoni@isti.cnr.it>
Date: Thu, 11 Feb 2016 15:43:20 +0000
Subject: [PATCH] Added Sgn function added hack for missing is_nan in mingw
 Thanks to Antonio Nicoletti

---
 vcg/math/base.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/vcg/math/base.h b/vcg/math/base.h
index 8b1dee3f..132c9ea1 100644
--- a/vcg/math/base.h
+++ b/vcg/math/base.h
@@ -186,9 +186,15 @@ inline float   ToRad(const float &a){return float(M_PI)*a/180.0f;}
 inline double  ToDeg(const double &a){return a*180.0/M_PI;}
 inline double  ToRad(const double &a){return M_PI*a/180.0;}
 
+template <typename T>
+int Sgn(T val) {
+    return (T(0) < val) - (val < T(0));
+}
 
 #if defined(_MSC_VER) // Microsoft Visual C++
 template<class T> int IsNAN(T t) {    return _isnan(t) || (!_finite(t)); }
+#elif defined(__MINGW32__) // GCC
+template<class T> int IsNAN(T t) {    return std::isnan(t) || std::isinf(t); }
 #elif defined(__GNUC__) // GCC
 template<class T> int IsNAN(T t) {    return isnan(t) || isinf(t); }
 #else // generic