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// -*- C++ -*-
// Copyright (C) 2005, 2006, 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/>.
// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied
// warranty.
/**
* @file hash_eq_fn.hpp
* Contains 2 eqivalence functions, one employing a hash value,
* and one ignoring it.
*/
#ifndef PB_DS_HASH_EQ_FN_HPP
#define PB_DS_HASH_EQ_FN_HPP
#include <utility>
#include <debug/debug.h>
namespace __gnu_pbds
{
namespace detail
{
template<typename Key, class Eq_Fn, class Allocator, bool Store_Hash>
struct hash_eq_fn;
#define PB_DS_CLASS_T_DEC \
template<typename Key, class Eq_Fn, class Allocator>
#define PB_DS_CLASS_C_DEC \
hash_eq_fn<Key, Eq_Fn, Allocator, false>
/**
* Specialization 1- The client requests that hash values not be stored.
**/
template<typename Key, class Eq_Fn, class Allocator>
struct hash_eq_fn<Key, Eq_Fn, Allocator, false> : public Eq_Fn
{
typedef Eq_Fn eq_fn_base;
typedef typename Allocator::template rebind<Key>::other key_allocator;
typedef typename key_allocator::const_reference const_key_reference;
hash_eq_fn();
hash_eq_fn(const Eq_Fn& r_eq_fn);
inline bool
operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const;
inline void
swap(const PB_DS_CLASS_C_DEC& other);
};
PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
hash_eq_fn()
{ }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
swap(const PB_DS_CLASS_C_DEC& other)
{ std::swap((Eq_Fn& )(*this), (Eq_Fn& )other); }
PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
hash_eq_fn(const Eq_Fn& r_eq_fn) :
Eq_Fn(r_eq_fn)
{ }
PB_DS_CLASS_T_DEC
inline bool
PB_DS_CLASS_C_DEC::
operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const
{ return (eq_fn_base::operator()(r_lhs_key, r_rhs_key)); }
#undef PB_DS_CLASS_T_DEC
#undef PB_DS_CLASS_C_DEC
#define PB_DS_CLASS_T_DEC \
template<typename Key, class Eq_Fn, class Allocator>
#define PB_DS_CLASS_C_DEC \
hash_eq_fn<Key, Eq_Fn, Allocator, true>
/**
* Specialization 2- The client requests that hash values be stored.
**/
template<typename Key, class Eq_Fn, class Allocator>
struct hash_eq_fn<Key, Eq_Fn, Allocator, true> :
public Eq_Fn
{
typedef typename Allocator::size_type size_type;
typedef Eq_Fn eq_fn_base;
typedef typename Allocator::template rebind<Key>::other key_allocator;
typedef typename key_allocator::const_reference const_key_reference;
hash_eq_fn();
hash_eq_fn(const Eq_Fn& r_eq_fn);
inline bool
operator()(const_key_reference r_lhs_key, size_type lhs_hash,
const_key_reference r_rhs_key, size_type rhs_hash) const;
inline void
swap(const PB_DS_CLASS_C_DEC& other);
};
PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
hash_eq_fn()
{ }
PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
hash_eq_fn(const Eq_Fn& r_eq_fn) :
Eq_Fn(r_eq_fn)
{ }
PB_DS_CLASS_T_DEC
inline bool
PB_DS_CLASS_C_DEC::
operator()(const_key_reference r_lhs_key, size_type lhs_hash,
const_key_reference r_rhs_key, size_type rhs_hash) const
{
_GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key)
|| lhs_hash == rhs_hash);
return (lhs_hash == rhs_hash &&
eq_fn_base::operator()(r_lhs_key, r_rhs_key));
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
swap(const PB_DS_CLASS_C_DEC& other)
{ std::swap((Eq_Fn& )(*this), (Eq_Fn& )(other)); }
#undef PB_DS_CLASS_T_DEC
#undef PB_DS_CLASS_C_DEC
} // namespace detail
} // namespace __gnu_pbds
#endif
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