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/
usr/
include/
c++/
4.6/
bits/
- drwxr-xr-x
|
Viewing file:  functional_hash.h (5.41 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
// functional_hash.h header -*- C++ -*-
// Copyright (C) 2007, 2008, 2009, 2010, 2011 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 bits/functional_hash.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{functional}
*/
#ifndef _FUNCTIONAL_HASH_H
#define _FUNCTIONAL_HASH_H 1
#pragma GCC system_header
#include <bits/hash_bytes.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/** @defgroup hashes Hashes
* @ingroup functors
*
* Hashing functors taking a variable type and returning a @c std::size_t.
*
* @{
*/
template<typename _Result, typename _Arg>
struct __hash_base
{
typedef _Result result_type;
typedef _Arg argument_type;
};
/// Primary class template hash.
template<typename _Tp>
struct hash : public __hash_base<size_t, _Tp>
{
size_t
operator()(_Tp __val) const;
};
/// Partial specializations for pointer types.
template<typename _Tp>
struct hash<_Tp*> : public __hash_base<size_t, _Tp*>
{
size_t
operator()(_Tp* __p) const
{ return reinterpret_cast<size_t>(__p); }
};
// Explicit specializations for integer types.
#define _Cxx_hashtable_define_trivial_hash(_Tp) \
template<> \
inline size_t \
hash<_Tp>::operator()(_Tp __val) const \
{ return static_cast<size_t>(__val); }
/// Explicit specialization for bool.
_Cxx_hashtable_define_trivial_hash(bool);
/// Explicit specialization for char.
_Cxx_hashtable_define_trivial_hash(char);
/// Explicit specialization for signed char.
_Cxx_hashtable_define_trivial_hash(signed char);
/// Explicit specialization for unsigned char.
_Cxx_hashtable_define_trivial_hash(unsigned char);
/// Explicit specialization for wchar_t.
_Cxx_hashtable_define_trivial_hash(wchar_t);
/// Explicit specialization for char16_t.
_Cxx_hashtable_define_trivial_hash(char16_t);
/// Explicit specialization for char32_t.
_Cxx_hashtable_define_trivial_hash(char32_t);
/// Explicit specialization for short.
_Cxx_hashtable_define_trivial_hash(short);
/// Explicit specialization for int.
_Cxx_hashtable_define_trivial_hash(int);
/// Explicit specialization for long.
_Cxx_hashtable_define_trivial_hash(long);
/// Explicit specialization for long long.
_Cxx_hashtable_define_trivial_hash(long long);
/// Explicit specialization for unsigned short.
_Cxx_hashtable_define_trivial_hash(unsigned short);
/// Explicit specialization for unsigned int.
_Cxx_hashtable_define_trivial_hash(unsigned int);
/// Explicit specialization for unsigned long.
_Cxx_hashtable_define_trivial_hash(unsigned long);
/// Explicit specialization for unsigned long long.
_Cxx_hashtable_define_trivial_hash(unsigned long long);
#undef _Cxx_hashtable_define_trivial_hash
struct _Hash_impl
{
static size_t
hash(const void* __ptr, size_t __clength,
size_t __seed = static_cast<size_t>(0xc70f6907UL))
{ return _Hash_bytes(__ptr, __clength, __seed); }
template<typename _Tp>
static size_t
hash(const _Tp& __val)
{ return hash(&__val, sizeof(__val)); }
template<typename _Tp>
static size_t
__hash_combine(const _Tp& __val, size_t __hash)
{ return hash(&__val, sizeof(__val), __hash); }
};
struct _Fnv_hash_impl
{
static size_t
hash(const void* __ptr, size_t __clength,
size_t __seed = static_cast<size_t>(2166136261UL))
{ return _Fnv_hash_bytes(__ptr, __clength, __seed); }
template<typename _Tp>
static size_t
hash(const _Tp& __val)
{ return hash(&__val, sizeof(__val)); }
template<typename _Tp>
static size_t
__hash_combine(const _Tp& __val, size_t __hash)
{ return hash(&__val, sizeof(__val), __hash); }
};
/// Specialization for float.
template<>
inline size_t
hash<float>::operator()(float __val) const
{
// 0 and -0 both hash to zero.
return __val != 0.0f ? std::_Hash_impl::hash(__val) : 0;
}
/// Specialization for double.
template<>
inline size_t
hash<double>::operator()(double __val) const
{
// 0 and -0 both hash to zero.
return __val != 0.0 ? std::_Hash_impl::hash(__val) : 0;
}
/// Specialization for long double.
template<>
_GLIBCXX_PURE size_t
hash<long double>::operator()(long double __val) const;
// @} group hashes
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // _FUNCTIONAL_HASH_H
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