From e5c3c14347517ac054c0f38ced78191a01d4f896 Mon Sep 17 00:00:00 2001
From: "pinkerton@google.com"
 <pinkerton@google.com@0039d316-1c4b-4281-b951-d872f2087c98>
Date: Wed, 6 Aug 2008 14:36:32 +0000
Subject: Use our own hash function that supports embedded NULLs for both char
 and wchar strings

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@431 0039d316-1c4b-4281-b951-d872f2087c98
---
 base/hash_tables.h | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/base/hash_tables.h b/base/hash_tables.h
index 10539d7..fe73ff3 100644
--- a/base/hash_tables.h
+++ b/base/hash_tables.h
@@ -40,16 +40,19 @@
 #ifndef BASE_HASH_TABLES_H__
 #define BASE_HASH_TABLES_H__
 
-#ifdef WIN32
+#include "build/build_config.h"
+
+#if defined(COMPILER_MSVC)
 #include <hash_map>
 #include <hash_set>
 namespace base {
 using stdext::hash_map;
 using stdext::hash_set;
 }
-#else
+#elif defined(COMPILER_GCC)
 #include <ext/hash_map>
 #include <ext/hash_set>
+#include <tr1/functional>
 namespace base {
 using __gnu_cxx::hash_map;
 using __gnu_cxx::hash_set;
@@ -59,52 +62,45 @@ using __gnu_cxx::hash_set;
 // be used as keys in STL maps and sets.
 namespace __gnu_cxx {
 
-inline size_t stl_hash_wstring(const wchar_t* s) {
-  unsigned long h = 0;
-  for ( ; *s; ++s)
-    h = 5 * h + *s;
-  return size_t(h);
-}
-
 template<>
 struct hash<wchar_t*> {
   size_t operator()(const wchar_t* s) const {
-    return stl_hash_wstring(s); 
+    return std::tr1::hash<const wchar_t*>()(s);
   }
 };
 
 template<>
 struct hash<const wchar_t*> {
   size_t operator()(const wchar_t* s) const {
-    return stl_hash_wstring(s); 
+    return std::tr1::hash<const wchar_t*>()(s);
   }
 };
 
 template<>
 struct hash<std::wstring> {
   size_t operator()(const std::wstring& s) const {
-    return stl_hash_wstring(s.c_str()); 
+    return std::tr1::hash<std::wstring>()(s);
   }
 };
 
 template<>
 struct hash<const std::wstring> {
   size_t operator()(const std::wstring& s) const {
-    return stl_hash_wstring(s.c_str());
+    return std::tr1::hash<std::wstring>()(s);
   }
 };
 
 template<>
 struct hash<std::string> {
   size_t operator()(const std::string& s) const {
-    return __stl_hash_string(s.c_str());
+    return std::tr1::hash<std::string>()(s);
   }
 };
 
 template<>
 struct hash<const std::string> {
   size_t operator()(const std::string& s) const {
-    return __stl_hash_string(s.c_str());
+    return std::tr1::hash<std::string>()(s);
   }
 };  
 
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