Move the hash limits workaround into its own file.

[SVN r53159]

hash/test/hash_float_test.hpp

@@ -14,7 +14,7 @@
 #include <boost/detail/lightweight_test.hpp>
 
 #include <cmath>
-#include <boost/limits.hpp>
+#include <boost/functional/hash/detail/limits.hpp>
 
 #include <iostream>
 

hash/test/hash_function_pointer_test.cpp

@@ -13,7 +13,6 @@
 
 #include <boost/detail/lightweight_test.hpp>
 
-#include <boost/limits.hpp>
 #include <boost/mpl/assert.hpp>
 #include <boost/type_traits/is_base_and_derived.hpp>
 

hash/test/hash_number_test.cpp

@@ -15,7 +15,7 @@
 #include <boost/detail/lightweight_test.hpp>
 
 #include <boost/preprocessor/cat.hpp>
-#include <boost/limits.hpp>
+#include <boost/functional/hash/detail/limits.hpp>
 #include <boost/mpl/assert.hpp>
 #include <boost/type_traits/is_base_and_derived.hpp>
 

hash/test/hash_string_test.cpp

@@ -13,7 +13,6 @@
 
 #include <boost/detail/lightweight_test.hpp>
 
-#include <boost/limits.hpp>
 #include <boost/mpl/assert.hpp>
 #include <boost/type_traits/is_base_and_derived.hpp>
 #include <string>

include/boost/functional/hash/detail/hash_float.hpp

@@ -19,9 +19,9 @@
 #endif
 
 #include <boost/functional/hash/detail/float_functions.hpp>
+#include <boost/functional/hash/detail/limits.hpp>
 #include <boost/integer/static_log2.hpp>
 #include <boost/cstdint.hpp>
-#include <boost/limits.hpp>
 #include <boost/assert.hpp>
 
 // Select implementation for the current platform.
@@ -50,43 +50,10 @@
 
 #endif
 
-// On OpenBSD, numeric_limits is not reliable for long doubles, but
-// the macros defined in <float.h> are.
-
-#if defined(__OpenBSD__)
-#include <float.h>
-#endif
-
 namespace boost
 {
     namespace hash_detail
     {
-        template <class T>
-        struct limits : std::numeric_limits<T> {};
-
-#if defined(__OpenBSD__)
-        template <>
-        struct limits<long double>
-             : std::numeric_limits<long double>
-        {
-            static long double epsilon() {
-                return LDBL_EPSILON;
-            }
-
-            static long double (max)() {
-                return LDBL_MAX;
-            }
-
-            static long double (min)() {
-                return LDBL_MIN;
-            }
-
-            BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG);
-            BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP);
-            BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP);
-        };
-#endif // __OpenBSD__
-
         inline void hash_float_combine(std::size_t& seed, std::size_t value)
         {
             seed ^= value + (seed<<6) + (seed>>2);

include/boost/functional/hash/detail/limits.hpp

@@ -0,0 +1,57 @@
+
+// Copyright 2005-2009 Daniel James.
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// On some platforms std::limits gives incorrect values for long double.
+// This tries to work around them.
+
+#if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER)
+#define BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <boost/limits.hpp>
+
+// On OpenBSD, numeric_limits is not reliable for long doubles, but
+// the macros defined in <float.h> are.
+
+#if defined(__OpenBSD__)
+#include <float.h>
+#endif
+
+namespace boost
+{
+    namespace hash_detail
+    {
+        template <class T>
+        struct limits : std::numeric_limits<T> {};
+
+#if defined(__OpenBSD__)
+        template <>
+        struct limits<long double>
+             : std::numeric_limits<long double>
+        {
+            static long double epsilon() {
+                return LDBL_EPSILON;
+            }
+
+            static long double (max)() {
+                return LDBL_MAX;
+            }
+
+            static long double (min)() {
+                return LDBL_MIN;
+            }
+
+            BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG);
+            BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP);
+            BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP);
+        };
+#endif // __OpenBSD__
+    }
+}
+
+#endif

include/boost/functional/hash/hash.hpp

@@ -15,6 +15,7 @@
 #include <boost/functional/hash/detail/hash_float.hpp>
 #include <boost/detail/container_fwd.hpp>
 #include <string>
+#include <boost/limits.hpp>
 
 #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
 #include <boost/type_traits/is_pointer.hpp>