[v3] Change std::hash to not derive from std::unary_function

Index: include/debug/bitset
===================================================================
--- include/debug/bitset	(revision 164526)
+++ include/debug/bitset	(working copy)
@@ -385,7 +385,7 @@ 
   /// std::hash specialization for bitset.
   template<size_t _Nb>
     struct hash<__debug::bitset<_Nb>>
-    : public std::unary_function<__debug::bitset<_Nb>, size_t>
+    : public __hash_base<size_t, __debug::bitset<_Nb>>
     {
       size_t
       operator()(const __debug::bitset<_Nb>& __b) const
Index: include/debug/vector
===================================================================
--- include/debug/vector	(revision 164526)
+++ include/debug/vector	(working copy)
@@ -584,7 +584,7 @@ 
   /// std::hash specialization for vector<bool>.
   template<typename _Alloc>
     struct hash<__debug::vector<bool, _Alloc>>
-    : public std::unary_function<__debug::vector<bool, _Alloc>, size_t>
+    : public __hash_base<size_t, __debug::vector<bool, _Alloc>>
     {
       size_t
       operator()(const __debug::vector<bool, _Alloc>& __b) const
Index: include/std/system_error
===================================================================
--- include/std/system_error	(revision 164526)
+++ include/std/system_error	(working copy)
@@ -353,7 +353,7 @@ 
   /// std::hash specialization for error_code.
   template<>
     struct hash<error_code>
-    : public std::unary_function<error_code, size_t>
+    : public __hash_base<size_t, error_code>
     {
       size_t
       operator()(const error_code& __e) const
Index: include/std/thread
===================================================================
--- include/std/thread	(revision 164526)
+++ include/std/thread	(working copy)
@@ -56,9 +56,6 @@ 
    * @{
    */
 
-  template<typename _Tp>
-    struct hash;
-
   /// thread
   class thread
   {
@@ -224,7 +221,7 @@ 
   /// std::hash specialization for thread::id.
   template<>
     struct hash<thread::id>
-    : public std::unary_function<thread::id, size_t>
+    : public __hash_base<size_t, thread::id>
     {
       size_t
       operator()(const thread::id& __id) const
Index: include/std/bitset
===================================================================
--- include/std/bitset	(revision 164526)
+++ include/std/bitset	(working copy)
@@ -1495,7 +1495,7 @@ 
   /// std::hash specialization for bitset.
   template<size_t _Nb>
     struct hash<_GLIBCXX_STD_D::bitset<_Nb>>
-    : public std::unary_function<_GLIBCXX_STD_D::bitset<_Nb>, size_t>
+    : public __hash_base<size_t, _GLIBCXX_STD_D::bitset<_Nb>>
     {
       size_t
       operator()(const _GLIBCXX_STD_D::bitset<_Nb>& __b) const
@@ -1507,7 +1507,7 @@ 
 
   template<>
     struct hash<_GLIBCXX_STD_D::bitset<0>>
-    : public std::unary_function<_GLIBCXX_STD_D::bitset<0>, size_t>
+    : public __hash_base<size_t, _GLIBCXX_STD_D::bitset<0>>
     {
       size_t
       operator()(const _GLIBCXX_STD_D::bitset<0>&) const
Index: include/std/typeindex
===================================================================
--- include/std/typeindex	(revision 164526)
+++ include/std/typeindex	(working copy)
@@ -35,9 +35,7 @@ 
 # include <bits/c++0x_warning.h>
 #else
 
-#include <bits/c++config.h>
 #include <typeinfo>
-#include <bits/stl_function.h> // For unary_function
 
 namespace std
 {
@@ -92,8 +90,10 @@ 
   /// std::hash specialization for type_index.
   template<>
     struct hash<type_index>
-    : public std::unary_function<type_index, size_t>
     {
+      typedef size_t        result_type;
+      typedef type_index  argument_type;
+
       size_t
       operator()(const type_index& __ti) const
       { return __ti.hash_code(); }
Index: include/profile/bitset
===================================================================
--- include/profile/bitset	(revision 164526)
+++ include/profile/bitset	(working copy)
@@ -359,7 +359,7 @@ 
   /// std::hash specialization for bitset.
   template<size_t _Nb>
     struct hash<__profile::bitset<_Nb>>
-    : public std::unary_function<__profile::bitset<_Nb>, size_t>
+    : public __hash_base<size_t, __profile::bitset<_Nb>>
     {
       size_t
       operator()(const __profile::bitset<_Nb>& __b) const
Index: include/profile/vector
===================================================================
--- include/profile/vector	(revision 164526)
+++ include/profile/vector	(working copy)
@@ -505,7 +505,7 @@ 
   /// std::hash specialization for vector<bool>.
   template<typename _Alloc>
     struct hash<__profile::vector<bool, _Alloc>>
-    : public std::unary_function<__profile::vector<bool, _Alloc>, size_t>
+    : public __hash_base<size_t, __profile::vector<bool, _Alloc>>
     {
       size_t
       operator()(const __profile::vector<bool, _Alloc>& __b) const
Index: include/bits/functional_hash.h
===================================================================
--- include/bits/functional_hash.h	(revision 164526)
+++ include/bits/functional_hash.h	(working copy)
@@ -33,7 +33,6 @@ 
 #pragma GCC system_header
 
 #include <bits/c++config.h>
-#include <bits/stl_function.h>
 
 namespace std
 {
@@ -45,9 +44,16 @@ 
    *  @{
    */
 
+  template<typename _Result, typename _Arg>
+    struct __hash_base
+    {
+      typedef _Result     result_type;
+      typedef _Arg      argument_type;
+    };
+
   /// Primary class template hash.
   template<typename _Tp>
-    struct hash : public std::unary_function<_Tp, size_t>
+    struct hash : public __hash_base<size_t, _Tp>
     {
       size_t
       operator()(_Tp __val) const;
@@ -55,7 +61,7 @@ 
 
   /// Partial specializations for pointer types.
   template<typename _Tp>
-    struct hash<_Tp*> : public std::unary_function<_Tp*, size_t>
+    struct hash<_Tp*> : public __hash_base<size_t, _Tp*>
     {
       size_t
       operator()(_Tp* __p) const
Index: include/bits/basic_string.h
===================================================================
--- include/bits/basic_string.h	(revision 164526)
+++ include/bits/basic_string.h	(working copy)
@@ -2925,7 +2925,7 @@ 
   /// std::hash specialization for string.
   template<>
     struct hash<string>
-    : public std::unary_function<string, size_t>
+    : public __hash_base<size_t, string>
     {
       size_t
       operator()(const string& __s) const
@@ -2936,7 +2936,7 @@ 
   /// std::hash specialization for wstring.
   template<>
     struct hash<wstring>
-    : public std::unary_function<wstring, size_t>
+    : public __hash_base<size_t, wstring>
     {
       size_t
       operator()(const wstring& __s) const
@@ -2950,7 +2950,7 @@ 
   /// std::hash specialization for u16string.
   template<>
     struct hash<u16string>
-    : public std::unary_function<u16string, size_t>
+    : public __hash_base<size_t, u16string>
     {
       size_t
       operator()(const u16string& __s) const
@@ -2961,7 +2961,7 @@ 
   /// std::hash specialization for u32string.
   template<>
     struct hash<u32string>
-    : public std::unary_function<u32string, size_t>
+    : public __hash_base<size_t, u32string>
     {
       size_t
       operator()(const u32string& __s) const
Index: include/bits/stl_bvector.h
===================================================================
--- include/bits/stl_bvector.h	(revision 164526)
+++ include/bits/stl_bvector.h	(working copy)
@@ -1038,7 +1038,7 @@ 
   /// std::hash specialization for vector<bool>.
   template<typename _Alloc>
     struct hash<_GLIBCXX_STD_D::vector<bool, _Alloc>>
-    : public std::unary_function<_GLIBCXX_STD_D::vector<bool, _Alloc>, size_t>
+    : public __hash_base<size_t, _GLIBCXX_STD_D::vector<bool, _Alloc>>
     {
       size_t
       operator()(const _GLIBCXX_STD_D::vector<bool, _Alloc>& __b) const;