1 // Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
3 // Copyright (C) 2009 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
28 #include <system_error>
30 #ifndef __GXX_EXPERIMENTAL_CXX0X__
31 # error "compatibility-c++0x.cc must be compiled with -std=gnu++0x"
36 // We need these due to the symbols exported since GLIBCXX_3.4.10.
37 // See libstdc++/41662 for details.
39 template<typename _Tp>
40 struct hash : public std::unary_function<_Tp, size_t>
43 operator()(_Tp __val) const;
46 /// Dummy generic implementation (for sizeof(size_t) != 4, 8).
47 template<size_t = sizeof(size_t)>
51 hash(const char* __first, size_t __length)
54 for (; __length > 0; --__length)
55 __result = (__result * 131) + *__first++;
64 hash(const char* __first, size_t __length)
66 size_t __result = static_cast<size_t>(2166136261UL);
67 for (; __length > 0; --__length)
69 __result ^= static_cast<size_t>(*__first++);
70 __result *= static_cast<size_t>(16777619UL);
80 hash(const char* __first, size_t __length)
83 static_cast<size_t>(14695981039346656037ULL);
84 for (; __length > 0; --__length)
86 __result ^= static_cast<size_t>(*__first++);
87 __result *= static_cast<size_t>(1099511628211ULL);
97 hash<error_code>::operator()(error_code __e) const
99 const char* __p = reinterpret_cast<const char*>(&__e);
100 return _Fnv_hash<>::hash(__p, sizeof(__e));