base/hash.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef BASE_HASH_H_
   6 #define BASE_HASH_H_
   7
   8 #include <string>
   9
  10 #include "base/base_export.h"
  11 #include "base/basictypes.h"
  12
  13 namespace base {
  14
  15 // From http://www.azillionmonkeys.com/qed/hash.html
  16 // This is the hash used on WebCore/platform/stringhash
  17 BASE_EXPORT uint32 SuperFastHash(const char * data, int len);
  18
  19 inline uint32 Hash(const char* key, size_t length) {
  20   return SuperFastHash(key, static_cast<int>(length));
  21 }
  22
  23 inline uint32 Hash(const std::string& key) {
  24   if (key.empty())
  25     return 0;
  26   return SuperFastHash(key.data(), static_cast<int>(key.size()));
  27 }
  28
  29 }  // namespace base
  30
  31 #endif  // BASE_HASH_H_