From 28ddb5158dbe2a633a11f77ad7145ceae08abbf3 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 28 Oct 2015 16:27:20 +0100
Subject: Enable std::isfinite/nan/inf on MSVC 2013 and newer and clang. Fix
 isinf for gcc4.4 and older msvc with fast-math.

---
 test/fastmath.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'test/fastmath.cpp')

diff --git a/test/fastmath.cpp b/test/fastmath.cpp
index 2911c0544..16462d54f 100644
--- a/test/fastmath.cpp
+++ b/test/fastmath.cpp
@@ -18,6 +18,14 @@ void check(bool b, bool ref)
     std::cout << " BAD ";
 }
 
+#if EIGEN_COMP_MSVC < 1800
+namespace std {
+  template<typename T> bool (isfinite)(T x) { return _finite(x); }
+  template<typename T> bool (isnan)(T x) { return _isnan(x); }
+  template<typename T> bool (isinf)(T x) { return _fpclass(x)==_FPCLASS_NINF || _fpclass(x)==_FPCLASS_PINF; }
+}
+#endif
+
 template<typename T>
 void check_inf_nan(bool dryrun) {
   Matrix<T,Dynamic,1> m(10);
-- 
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