From c84ac7de10da47f93add15461027fab7576c3e34 Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Wed, 2 Jan 2008 18:08:43 +0000
Subject: [PATCH] Remove the _fpclass code from floating point hash.

[SVN r42416]
---
 .../boost/functional/detail/hash_float.hpp    | 31 ++-----------------
 1 file changed, 2 insertions(+), 29 deletions(-)

diff --git a/include/boost/functional/detail/hash_float.hpp b/include/boost/functional/detail/hash_float.hpp
index 298d0c0..92b2b66 100644
--- a/include/boost/functional/detail/hash_float.hpp
+++ b/include/boost/functional/detail/hash_float.hpp
@@ -38,7 +38,7 @@
 
 // STLport
 #elif defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
-// _fpclass and fpclassify aren't good enough on STLport.
+// fpclassify aren't good enough on STLport.
 
 // GNU libstdc++ 3
 #elif defined(__GLIBCPP__) || defined(__GLIBCXX__)
@@ -50,12 +50,7 @@
 // Dinkumware Library, on Visual C++ 
 #elif (defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER)
 
-// Not using _fpclass because it causes a warning about a conversion
-// from 'long double' to 'double'. Pity.
-// 
-//#  if defined(BOOST_MSVC)
-//#    define BOOST_HASH_USE_FPCLASS
-//#  endif
+// Not using _fpclass because it is only available for double.
 
 #endif
 
@@ -160,28 +155,6 @@ namespace boost
                 BOOST_ASSERT(0);
                 return 0;
             }
-#elif defined(BOOST_HASH_USE_FPCLASS)
-            switch(_fpclass(v)) {
-            case _FPCLASS_NZ:
-            case _FPCLASS_PZ:
-                return 0;
-            case _FPCLASS_PINF:
-                return (std::size_t)(-1);
-            case _FPCLASS_NINF:
-                return (std::size_t)(-2);
-            case _FPCLASS_SNAN:
-            case _FPCLASS_QNAN:
-                return (std::size_t)(-3);
-            case _FPCLASS_NN:
-            case _FPCLASS_ND:
-                return float_hash_impl(v);
-            case _FPCLASS_PD:
-            case _FPCLASS_PN:
-                return float_hash_impl(v);
-            default:
-                BOOST_ASSERT(0);
-                return 0;
-            }
 #else
             return v == 0 ? 0 : float_hash_impl(v);
 #endif