From be1be0d1fe72bf55228895a5fd4b3ff34aadcdc2 Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Tue, 12 Apr 2005 20:23:09 +0000
Subject: [PATCH] Deal with NaN & infinity in the hash float function on
 Broland.

[SVN r28186]
---
 include/boost/functional/hash/hash.hpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/boost/functional/hash/hash.hpp b/include/boost/functional/hash/hash.hpp
index b127623..e0e1b42 100644
--- a/include/boost/functional/hash/hash.hpp
+++ b/include/boost/functional/hash/hash.hpp
@@ -220,6 +220,15 @@ namespace boost
         template <class T>
         inline std::size_t float_hash_value(T v)
         {
+#if defined(__BORLAND__)
+            if(v == std::numeric_limits<double>::quiet_NaN())
+                return 0;
+            if(v == std::numeric_limits<double>::infinity())
+                return 1;
+            if(v == -std::numeric_limits<double>::infinity())
+                return 2;
+#endif
+
             int exp;
             v = boost::hash_detail::call_frexp(v, &exp);