--- /dev/null
+// TR1 functional_hash.h header -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file tr1/functional_hash.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{tr1/functional}
+ */
+
+#ifndef _GLIBCXX_TR1_FUNCTIONAL_HASH_H
+#define _GLIBCXX_TR1_FUNCTIONAL_HASH_H 1
+
+#pragma GCC system_header
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+namespace tr1
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /// Class template hash.
+ // Declaration of default hash functor std::tr1::hash. The types for
+ // which std::tr1::hash<T> is well-defined is in clause 6.3.3. of the PDTR.
+ template<typename _Tp>
+ struct hash : public std::unary_function<_Tp, size_t>
+ {
+ size_t
+ operator()(_Tp __val) const;
+ };
+
+ /// Partial specializations for pointer types.
+ template<typename _Tp>
+ struct hash<_Tp*> : public std::unary_function<_Tp*, size_t>
+ {
+ size_t
+ operator()(_Tp* __p) const
+ { return reinterpret_cast<size_t>(__p); }
+ };
+
+ /// Explicit specializations for integer types.
+#define _TR1_hashtable_define_trivial_hash(_Tp) \
+ template<> \
+ inline size_t \
+ hash<_Tp>::operator()(_Tp __val) const \
+ { return static_cast<size_t>(__val); }
+
+ _TR1_hashtable_define_trivial_hash(bool);
+ _TR1_hashtable_define_trivial_hash(char);
+ _TR1_hashtable_define_trivial_hash(signed char);
+ _TR1_hashtable_define_trivial_hash(unsigned char);
+ _TR1_hashtable_define_trivial_hash(wchar_t);
+ _TR1_hashtable_define_trivial_hash(short);
+ _TR1_hashtable_define_trivial_hash(int);
+ _TR1_hashtable_define_trivial_hash(long);
+ _TR1_hashtable_define_trivial_hash(long long);
+ _TR1_hashtable_define_trivial_hash(unsigned short);
+ _TR1_hashtable_define_trivial_hash(unsigned int);
+ _TR1_hashtable_define_trivial_hash(unsigned long);
+ _TR1_hashtable_define_trivial_hash(unsigned long long);
+
+#undef _TR1_hashtable_define_trivial_hash
+
+ // Fowler / Noll / Vo (FNV) Hash (type FNV-1a)
+ // (Used by the next specializations of std::tr1::hash.)
+
+ /// Dummy generic implementation (for sizeof(size_t) != 4, 8).
+ template<size_t>
+ struct _Fnv_hash_base
+ {
+ template<typename _Tp>
+ static size_t
+ hash(const _Tp* __ptr, size_t __clength)
+ {
+ size_t __result = 0;
+ const char* __cptr = reinterpret_cast<const char*>(__ptr);
+ for (; __clength; --__clength)
+ __result = (__result * 131) + *__cptr++;
+ return __result;
+ }
+ };
+
+ template<>
+ struct _Fnv_hash_base<4>
+ {
+ template<typename _Tp>
+ static size_t
+ hash(const _Tp* __ptr, size_t __clength)
+ {
+ size_t __result = static_cast<size_t>(2166136261UL);
+ const char* __cptr = reinterpret_cast<const char*>(__ptr);
+ for (; __clength; --__clength)
+ {
+ __result ^= static_cast<size_t>(*__cptr++);
+ __result *= static_cast<size_t>(16777619UL);
+ }
+ return __result;
+ }
+ };
+
+ template<>
+ struct _Fnv_hash_base<8>
+ {
+ template<typename _Tp>
+ static size_t
+ hash(const _Tp* __ptr, size_t __clength)
+ {
+ size_t __result
+ = static_cast<size_t>(14695981039346656037ULL);
+ const char* __cptr = reinterpret_cast<const char*>(__ptr);
+ for (; __clength; --__clength)
+ {
+ __result ^= static_cast<size_t>(*__cptr++);
+ __result *= static_cast<size_t>(1099511628211ULL);
+ }
+ return __result;
+ }
+ };
+
+ struct _Fnv_hash
+ : public _Fnv_hash_base<sizeof(size_t)>
+ {
+ using _Fnv_hash_base<sizeof(size_t)>::hash;
+
+ template<typename _Tp>
+ static size_t
+ hash(const _Tp& __val)
+ { return hash(&__val, sizeof(__val)); }
+ };
+
+ /// Explicit specializations for float.
+ template<>
+ inline size_t
+ hash<float>::operator()(float __val) const
+ {
+ // 0 and -0 both hash to zero.
+ return __val != 0.0f ? std::tr1::_Fnv_hash::hash(__val) : 0;
+ }
+
+ /// Explicit specializations for double.
+ template<>
+ inline size_t
+ hash<double>::operator()(double __val) const
+ {
+ // 0 and -0 both hash to zero.
+ return __val != 0.0 ? std::tr1::_Fnv_hash::hash(__val) : 0;
+ }
+
+ /// Explicit specializations for long double.
+ template<>
+ _GLIBCXX_PURE size_t
+ hash<long double>::operator()(long double __val) const;
+
+ /// Explicit specialization of member operator for non-builtin types.
+ template<>
+ _GLIBCXX_PURE size_t
+ hash<string>::operator()(string) const;
+
+ template<>
+ _GLIBCXX_PURE size_t
+ hash<const string&>::operator()(const string&) const;
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ template<>
+ _GLIBCXX_PURE size_t
+ hash<wstring>::operator()(wstring) const;
+
+ template<>
+ _GLIBCXX_PURE size_t
+ hash<const wstring&>::operator()(const wstring&) const;
+#endif
+
+_GLIBCXX_END_NAMESPACE_VERSION
+}
+}
+
+#endif // _GLIBCXX_TR1_FUNCTIONAL_HASH_H
projects / cross.git / blobdiff