From bc41cbeb253eac2ba21f6245e869250971b91898 Mon Sep 17 00:00:00 2001
From: Benjamin Drung <bdrung@debian.org>
Date: Fri, 13 May 2016 23:18:41 +0200
Subject: [PATCH] Define wxIsNaN() as std::isnan() in C++11 mode

std::isnan() is always available when using C++11, so just use it.

Also pout the test for C++11 implementations of both wxIsNaN() and wxFinite()
first, eventually the rest of the checks will become obsolete and will be
removed.

Closes https://github.com/wxWidgets/wxWidgets/pull/283
---
 include/wx/math.h | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/wx/math.h b/include/wx/math.h
index 23ff2f031a..544b5c7d6e 100644
--- a/include/wx/math.h
+++ b/include/wx/math.h
@@ -53,11 +53,18 @@
 
 #ifdef __cplusplus
 
-/* Any C++11 compiler should provide isfinite() */
+/*
+    Things are simple with C++11: we have everything we need in std.
+    Eventually we will only have this section and not the legacy stuff below.
+ */
 #if __cplusplus >= 201103
     #include <cmath>
+
     #define wxFinite(x) std::isfinite(x)
-#elif defined(__VISUALC__) || defined(__BORLANDC__)
+    #define wxIsNaN(x) std::isnan(x)
+#else /* C++98 */
+
+#if defined(__VISUALC__) || defined(__BORLANDC__)
     #include <float.h>
     #define wxFinite(x) _finite(x)
 #elif defined(__MINGW64_TOOLCHAIN__) || defined(__clang__)
@@ -97,6 +104,8 @@
     #define wxIsNaN(x) ((x) != (x))
 #endif
 
+#endif /* C++11/C++98 */
+
 #ifdef __INTELC__
 
     inline bool wxIsSameDouble(double x, double y)