Imported gcc-4.4.3

[msp430-gcc.git] / libstdc++-v3 / include / tr1_impl / functional_hash.h

diff --git a/libstdc++-v3/include/tr1_impl/functional_hash.h b/libstdc++-v3/include/tr1_impl/functional_hash.h
new file mode 100644 (file)
index 0000000..665168c
--- /dev/null
+++ b/libstdc++-v3/include/tr1_impl/functional_hash.h
@@ -0,0 +1,183 @@
+// TR1 functional -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 2009 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_impl/functional_hash.h
+ *  This is an internal header file, included by other library headers.
+ *  You should not attempt to use it directly.
+ */
+
+namespace std
+{
+_GLIBCXX_BEGIN_NAMESPACE_TR1
+
+  /// 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);
+#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
+  _TR1_hashtable_define_trivial_hash(char16_t);
+  _TR1_hashtable_define_trivial_hash(char32_t);
+#endif
+  _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 = sizeof(size_t)>
+    struct _Fnv_hash
+    {
+      static size_t
+      hash(const char* __first, size_t __length)
+      {
+       size_t __result = 0;
+       for (; __length > 0; --__length)
+         __result = (__result * 131) + *__first++;
+       return __result;
+      }
+    };
+
+  template<>
+    struct _Fnv_hash<4>
+    {
+      static size_t
+      hash(const char* __first, size_t __length)
+      {
+       size_t __result = static_cast<size_t>(2166136261UL);
+       for (; __length > 0; --__length)
+         {
+           __result ^= static_cast<size_t>(*__first++);
+           __result *= static_cast<size_t>(16777619UL);
+         }
+       return __result;
+      }
+    };
+  
+  template<>
+    struct _Fnv_hash<8>
+    {
+      static size_t
+      hash(const char* __first, size_t __length)
+      {
+       size_t __result =
+         static_cast<size_t>(14695981039346656037ULL);
+       for (; __length > 0; --__length)
+         {
+           __result ^= static_cast<size_t>(*__first++);
+           __result *= static_cast<size_t>(1099511628211ULL);
+         }
+       return __result;
+      }
+    };
+
+  /// Explicit specializations for float.
+  template<>
+    inline size_t
+    hash<float>::operator()(float __val) const
+    {
+      size_t __result = 0;
+      
+      // 0 and -0 both hash to zero.
+      if (__val != 0.0f)
+       __result = _Fnv_hash<>::hash(reinterpret_cast<const char*>(&__val),
+                                    sizeof(__val));
+      return __result;
+    };
+
+  /// Explicit specializations for double.
+  template<>
+    inline size_t
+    hash<double>::operator()(double __val) const
+    {
+       size_t __result = 0;
+
+       // 0 and -0 both hash to zero.
+       if (__val != 0.0)
+         __result = _Fnv_hash<>::hash(reinterpret_cast<const char*>(&__val),
+                                      sizeof(__val));
+       return __result;
+    };
+
+  /// Explicit specializations for long double.
+  template<>
+    size_t
+    hash<long double>::operator()(long double __val) const;
+
+  /// Explicit specialization of member operator for non-builtin types.
+  template<>
+    size_t
+    hash<string>::operator()(string) const;
+
+  template<>
+    size_t
+    hash<const string&>::operator()(const string&) const;
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+  template<>
+    size_t
+    hash<wstring>::operator()(wstring) const;
+
+  template<>
+    size_t
+    hash<const wstring&>::operator()(const wstring&) const;
+#endif
+
+_GLIBCXX_END_NAMESPACE_TR1
+}