1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/hash_tables.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,109 @@
1.4 +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +//
1.8 +
1.9 +//
1.10 +// Deal with the differences between Microsoft and GNU implemenations
1.11 +// of hash_map. Allows all platforms to use |base::hash_map| and
1.12 +// |base::hash_set|.
1.13 +// eg:
1.14 +// base::hash_map<int> my_map;
1.15 +// base::hash_set<int> my_set;
1.16 +//
1.17 +
1.18 +#ifndef BASE_HASH_TABLES_H_
1.19 +#define BASE_HASH_TABLES_H_
1.20 +
1.21 +#include "build/build_config.h"
1.22 +
1.23 +#include "base/string16.h"
1.24 +
1.25 +#if defined(COMPILER_MSVC) || (defined(ANDROID) && defined(_STLP_STD_NAME))
1.26 +#include <hash_map>
1.27 +#include <hash_set>
1.28 +namespace base {
1.29 +#ifdef ANDROID
1.30 +using _STLP_STD_NAME::hash_map;
1.31 +using _STLP_STD_NAME::hash_set;
1.32 +#else
1.33 +using stdext::hash_map;
1.34 +using stdext::hash_set;
1.35 +#endif
1.36 +}
1.37 +#elif defined(COMPILER_GCC)
1.38 +// This is a hack to disable the gcc 4.4 warning about hash_map and hash_set
1.39 +// being deprecated. We can get rid of this when we upgrade to VS2008 and we
1.40 +// can use <tr1/unordered_map> and <tr1/unordered_set>.
1.41 +#ifdef __DEPRECATED
1.42 +#define CHROME_OLD__DEPRECATED __DEPRECATED
1.43 +#undef __DEPRECATED
1.44 +#endif
1.45 +
1.46 +#include <ext/hash_map>
1.47 +#include <ext/hash_set>
1.48 +#include <string>
1.49 +
1.50 +#ifdef CHROME_OLD__DEPRECATED
1.51 +#define __DEPRECATED CHROME_OLD__DEPRECATED
1.52 +#undef CHROME_OLD__DEPRECATED
1.53 +#endif
1.54 +
1.55 +namespace base {
1.56 +using __gnu_cxx::hash_map;
1.57 +using __gnu_cxx::hash_set;
1.58 +} // namespace base
1.59 +
1.60 +namespace __gnu_cxx {
1.61 +
1.62 +// The GNU C++ library provides identiy hash functions for many integral types,
1.63 +// but not for |long long|. This hash function will truncate if |size_t| is
1.64 +// narrower than |long long|. This is probably good enough for what we will
1.65 +// use it for.
1.66 +
1.67 +#define DEFINE_TRIVIAL_HASH(integral_type) \
1.68 + template<> \
1.69 + struct hash<integral_type> { \
1.70 + std::size_t operator()(integral_type value) const { \
1.71 + return static_cast<std::size_t>(value); \
1.72 + } \
1.73 + }
1.74 +
1.75 +DEFINE_TRIVIAL_HASH(long long);
1.76 +DEFINE_TRIVIAL_HASH(unsigned long long);
1.77 +
1.78 +#undef DEFINE_TRIVIAL_HASH
1.79 +
1.80 +// Implement string hash functions so that strings of various flavors can
1.81 +// be used as keys in STL maps and sets. The hash algorithm comes from the
1.82 +// GNU C++ library, in <tr1/functional>. It is duplicated here because GCC
1.83 +// versions prior to 4.3.2 are unable to compile <tr1/functional> when RTTI
1.84 +// is disabled, as it is in our build.
1.85 +
1.86 +#define DEFINE_STRING_HASH(string_type) \
1.87 + template<> \
1.88 + struct hash<string_type> { \
1.89 + std::size_t operator()(const string_type& s) const { \
1.90 + std::size_t result = 0; \
1.91 + for (string_type::const_iterator i = s.begin(); i != s.end(); ++i) \
1.92 + result = (result * 131) + *i; \
1.93 + return result; \
1.94 + } \
1.95 + }
1.96 +
1.97 +DEFINE_STRING_HASH(std::string);
1.98 +DEFINE_STRING_HASH(std::wstring);
1.99 +
1.100 +#if defined(WCHAR_T_IS_UTF32)
1.101 +// If string16 and std::wstring are not the same type, provide a
1.102 +// specialization for string16.
1.103 +DEFINE_STRING_HASH(string16);
1.104 +#endif // WCHAR_T_IS_UTF32
1.105 +
1.106 +#undef DEFINE_STRING_HASH
1.107 +
1.108 +} // namespace __gnu_cxx
1.109 +
1.110 +#endif // COMPILER
1.111 +
1.112 +#endif // BASE_HASH_TABLES_H_
