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[/] [altor32/] [trunk/] [gcc-x64/] [or1knd-elf/] [or1knd-elf/] [include/] [c++/] [4.8.0/] [bits/] [functional_hash.h] - Blame information for rev 35

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1 35 ultra_embe
// functional_hash.h header -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012
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// Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library.  This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/functional_hash.h
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 *  This is an internal header file, included by other library headers.
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 *  Do not attempt to use it directly. @headername{functional}
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 */
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#ifndef _FUNCTIONAL_HASH_H
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#define _FUNCTIONAL_HASH_H 1
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#pragma GCC system_header
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#include <bits/hash_bytes.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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  /** @defgroup hashes Hashes
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   *  @ingroup functors
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   *
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   *   Hashing functors taking a variable type and returning a @c std::size_t.
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   *
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   *  @{
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   */
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  template<typename _Result, typename _Arg>
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    struct __hash_base
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    {
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      typedef _Result     result_type;
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      typedef _Arg      argument_type;
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    };
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  /// Primary class template hash.
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  template<typename _Tp>
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    struct hash;
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  /// Partial specializations for pointer types.
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  template<typename _Tp>
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    struct hash<_Tp*> : public __hash_base<size_t, _Tp*>
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    {
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      size_t
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      operator()(_Tp* __p) const noexcept
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      { return reinterpret_cast<size_t>(__p); }
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    };
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  // Explicit specializations for integer types.
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#define _Cxx_hashtable_define_trivial_hash(_Tp)         \
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  template<>                                            \
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    struct hash<_Tp> : public __hash_base<size_t, _Tp>  \
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    {                                                   \
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      size_t                                            \
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      operator()(_Tp __val) const noexcept              \
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      { return static_cast<size_t>(__val); }            \
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    };
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  /// Explicit specialization for bool.
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  _Cxx_hashtable_define_trivial_hash(bool)
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  /// Explicit specialization for char.
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  _Cxx_hashtable_define_trivial_hash(char)
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  /// Explicit specialization for signed char.
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  _Cxx_hashtable_define_trivial_hash(signed char)
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  /// Explicit specialization for unsigned char.
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  _Cxx_hashtable_define_trivial_hash(unsigned char)
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  /// Explicit specialization for wchar_t.
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  _Cxx_hashtable_define_trivial_hash(wchar_t)
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  /// Explicit specialization for char16_t.
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  _Cxx_hashtable_define_trivial_hash(char16_t)
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  /// Explicit specialization for char32_t.
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  _Cxx_hashtable_define_trivial_hash(char32_t)
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  /// Explicit specialization for short.
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  _Cxx_hashtable_define_trivial_hash(short)
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  /// Explicit specialization for int.
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  _Cxx_hashtable_define_trivial_hash(int)
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  /// Explicit specialization for long.
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  _Cxx_hashtable_define_trivial_hash(long)
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  /// Explicit specialization for long long.
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  _Cxx_hashtable_define_trivial_hash(long long)
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  /// Explicit specialization for unsigned short.
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  _Cxx_hashtable_define_trivial_hash(unsigned short)
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  /// Explicit specialization for unsigned int.
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  _Cxx_hashtable_define_trivial_hash(unsigned int)
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  /// Explicit specialization for unsigned long.
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  _Cxx_hashtable_define_trivial_hash(unsigned long)
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  /// Explicit specialization for unsigned long long.
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  _Cxx_hashtable_define_trivial_hash(unsigned long long)
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#undef _Cxx_hashtable_define_trivial_hash
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  struct _Hash_impl
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  {
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    static size_t
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    hash(const void* __ptr, size_t __clength,
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         size_t __seed = static_cast<size_t>(0xc70f6907UL))
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    { return _Hash_bytes(__ptr, __clength, __seed); }
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    template<typename _Tp>
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      static size_t
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      hash(const _Tp& __val)
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      { return hash(&__val, sizeof(__val)); }
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    template<typename _Tp>
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      static size_t
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      __hash_combine(const _Tp& __val, size_t __hash)
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      { return hash(&__val, sizeof(__val), __hash); }
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  };
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  struct _Fnv_hash_impl
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  {
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    static size_t
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    hash(const void* __ptr, size_t __clength,
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         size_t __seed = static_cast<size_t>(2166136261UL))
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    { return _Fnv_hash_bytes(__ptr, __clength, __seed); }
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    template<typename _Tp>
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      static size_t
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      hash(const _Tp& __val)
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      { return hash(&__val, sizeof(__val)); }
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    template<typename _Tp>
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      static size_t
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      __hash_combine(const _Tp& __val, size_t __hash)
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      { return hash(&__val, sizeof(__val), __hash); }
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  };
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  /// Specialization for float.
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  template<>
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    struct hash<float> : public __hash_base<size_t, float>
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    {
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      size_t
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      operator()(float __val) const noexcept
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      {
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        // 0 and -0 both hash to zero.
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        return __val != 0.0f ? std::_Hash_impl::hash(__val) : 0;
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      }
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    };
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  /// Specialization for double.
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  template<>
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    struct hash<double> : public __hash_base<size_t, double>
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    {
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      size_t
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      operator()(double __val) const noexcept
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      {
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        // 0 and -0 both hash to zero.
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        return __val != 0.0 ? std::_Hash_impl::hash(__val) : 0;
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      }
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    };
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  /// Specialization for long double.
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  template<>
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    struct hash<long double>
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    : public __hash_base<size_t, long double>
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    {
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      _GLIBCXX_PURE size_t
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      operator()(long double __val) const noexcept;
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    };
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  // @} group hashes
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif // _FUNCTIONAL_HASH_H

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