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// TR1 functional header -*- C++ -*-
// Copyright (C) 2004, 2005 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 2, 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file
* This is a TR1 C++ Library header.
*/
#ifndef _TR1_FUNCTIONAL
#define _TR1_FUNCTIONAL 1
#include "../functional"
#include <string> // for std::tr1::hash
namespace std
{
namespace tr1
{
template<typename _Tp>
class reference_wrapper
{
_Tp* _M_data;
public:
typedef _Tp type;
explicit reference_wrapper(_Tp& __indata): _M_data(&__indata)
{ }
reference_wrapper(const reference_wrapper<_Tp>& __inref):
_M_data(__inref._M_data)
{ }
reference_wrapper&
operator=(const reference_wrapper<_Tp>& __inref)
{
_M_data = __inref._M_data;
return *this;
}
operator _Tp&() const
{ return this->get(); }
_Tp&
get() const
{ return *_M_data; }
};
// Denotes a reference should be taken to a variable.
template<typename _Tp>
reference_wrapper<_Tp>
ref(_Tp& __t)
{ return reference_wrapper<_Tp>(__t); }
// Denotes a const reference should be taken to a variable.
template<typename _Tp>
reference_wrapper<const _Tp>
cref(const _Tp& __t)
{ return reference_wrapper<const _Tp>(__t); }
template<typename _Tp>
reference_wrapper<_Tp> ref(reference_wrapper<_Tp> __t)
{ return ref(__t.get()); }
template<typename _Tp>
reference_wrapper<const _Tp> cref(reference_wrapper<_Tp> __t)
{ return cref(__t.get()); }
// Definition of default hash function std::tr1::hash<>. The types for
// which std::tr1::hash<T> is defined is in clause 6.3.3. of the PDTR.
template <typename T> struct hash;
#define tr1_hashtable_define_trivial_hash(T) \
template <> struct hash<T> { \
std::size_t operator()(T val) const { return static_cast<std::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(unsigned short);
tr1_hashtable_define_trivial_hash(unsigned int);
tr1_hashtable_define_trivial_hash(unsigned long);
tr1_hashtable_define_trivial_hash(float);
tr1_hashtable_define_trivial_hash(double);
tr1_hashtable_define_trivial_hash(long double);
#undef tr1_hashtable_define_trivial_hash
template <typename T>
struct hash<T*> {
std::size_t operator()(T* p) const {
return reinterpret_cast<std::size_t>(p);
}
};
// ??? We can probably find a better hash function than this (i.e. one
// that vectorizes better and that produces a more uniform distribution).
// XXX String hash probably shouldn't be an inline member function,
// since it's nontrivial. Once we have the framework for TR1 .cc
// files, this should go in one.
template <>
struct hash<std::string>
{
std::size_t operator()(const std::string& s) const
{
std::size_t result = 0;
for (std::string::const_iterator i = s.begin(); i != s.end(); ++i)
result = (result * 131) + *i;
return result;
}
};
#ifdef _GLIBCXX_USE_WCHAR_T
template <>
struct hash<std::wstring>
{
std::size_t operator()(const std::wstring& s) const
{
std::size_t result = 0;
for (std::wstring::const_iterator i = s.begin(); i != s.end(); ++i)
result = (result * 131) + *i;
return result;
}
};
#endif
}
}
#endif
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