// -*- C++ -*-
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// Copyright (C) 2005-2017 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 terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// 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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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file ranged_hash_fn.hpp
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* Contains a unified ranged hash functor, allowing the hash tables
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* to deal with a single class for ranged hashing.
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*/
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#ifndef PB_DS_RANGED_HASH_FN_HPP
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#define PB_DS_RANGED_HASH_FN_HPP
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#include <utility>
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#include <debug/debug.h>
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namespace __gnu_pbds
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{
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namespace detail
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{
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/// Primary template.
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template<typename Key, typename Hash_Fn, typename _Alloc,
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typename Comb_Hash_Fn, bool Store_Hash>
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class ranged_hash_fn;
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#define PB_DS_CLASS_T_DEC \
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template<typename Key, typename Hash_Fn, typename _Alloc, \
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typename Comb_Hash_Fn>
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#define PB_DS_CLASS_C_DEC \
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ranged_hash_fn<Key, Hash_Fn, _Alloc, Comb_Hash_Fn, false>
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/**
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* Specialization 1
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* The client supplies a hash function and a ranged hash function,
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* and requests that hash values not be stored.
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**/
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template<typename Key, typename Hash_Fn, typename _Alloc,
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typename Comb_Hash_Fn>
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class ranged_hash_fn< Key, Hash_Fn, _Alloc, Comb_Hash_Fn, false>
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: public Hash_Fn, public Comb_Hash_Fn
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{
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protected:
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typedef typename _Alloc::size_type size_type;
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typedef Hash_Fn hash_fn_base;
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typedef Comb_Hash_Fn comb_hash_fn_base;
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typedef typename _Alloc::template rebind< Key>::other key_allocator;
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typedef typename key_allocator::const_reference key_const_reference;
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ranged_hash_fn(size_type);
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ranged_hash_fn(size_type, const Hash_Fn&);
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ranged_hash_fn(size_type, const Hash_Fn&, const Comb_Hash_Fn&);
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void
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swap(PB_DS_CLASS_C_DEC&);
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void
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notify_resized(size_type);
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inline size_type
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operator()(key_const_reference) const;
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};
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size)
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{ Comb_Hash_Fn::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn)
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: Hash_Fn(r_hash_fn)
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{ Comb_Hash_Fn::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn,
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const Comb_Hash_Fn& r_comb_hash_fn)
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: Hash_Fn(r_hash_fn), Comb_Hash_Fn(r_comb_hash_fn)
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{ comb_hash_fn_base::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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swap(PB_DS_CLASS_C_DEC& other)
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{
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comb_hash_fn_base::swap(other);
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std::swap((Hash_Fn& )(*this), (Hash_Fn& )other);
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}
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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notify_resized(size_type size)
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{ comb_hash_fn_base::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::size_type
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PB_DS_CLASS_C_DEC::
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operator()(key_const_reference r_key) const
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{ return (comb_hash_fn_base::operator()(hash_fn_base::operator()(r_key)));}
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#undef PB_DS_CLASS_T_DEC
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#undef PB_DS_CLASS_C_DEC
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#define PB_DS_CLASS_T_DEC \
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template<typename Key, typename Hash_Fn, typename _Alloc, \
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typename Comb_Hash_Fn>
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#define PB_DS_CLASS_C_DEC \
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ranged_hash_fn<Key,Hash_Fn, _Alloc, Comb_Hash_Fn, true>
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/**
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* Specialization 2
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* The client supplies a hash function and a ranged hash function,
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* and requests that hash values be stored.
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**/
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template<typename Key, typename Hash_Fn, typename _Alloc,
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typename Comb_Hash_Fn>
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class ranged_hash_fn<Key, Hash_Fn, _Alloc, Comb_Hash_Fn, true>
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: public Hash_Fn, public Comb_Hash_Fn
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{
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protected:
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typedef typename _Alloc::size_type size_type;
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typedef std::pair<size_type, size_type> comp_hash;
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typedef Hash_Fn hash_fn_base;
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typedef Comb_Hash_Fn comb_hash_fn_base;
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typedef typename _Alloc::template rebind<Key>::other key_allocator;
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typedef typename key_allocator::const_reference key_const_reference;
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ranged_hash_fn(size_type);
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ranged_hash_fn(size_type, const Hash_Fn&);
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ranged_hash_fn(size_type, const Hash_Fn&, const Comb_Hash_Fn&);
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void
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swap(PB_DS_CLASS_C_DEC&);
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void
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notify_resized(size_type);
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inline comp_hash
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operator()(key_const_reference) const;
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inline comp_hash
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operator()(key_const_reference, size_type) const;
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};
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size)
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{ Comb_Hash_Fn::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn) :
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Hash_Fn(r_hash_fn)
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{ Comb_Hash_Fn::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn,
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const Comb_Hash_Fn& r_comb_hash_fn)
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: Hash_Fn(r_hash_fn), Comb_Hash_Fn(r_comb_hash_fn)
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{ comb_hash_fn_base::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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swap(PB_DS_CLASS_C_DEC& other)
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{
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comb_hash_fn_base::swap(other);
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std::swap((Hash_Fn& )(*this), (Hash_Fn& )other);
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}
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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notify_resized(size_type size)
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{ comb_hash_fn_base::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::comp_hash
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PB_DS_CLASS_C_DEC::
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operator()(key_const_reference r_key) const
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{
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const size_type hash = hash_fn_base::operator()(r_key);
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return std::make_pair(comb_hash_fn_base::operator()(hash), hash);
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}
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::comp_hash
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PB_DS_CLASS_C_DEC::
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operator()
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#ifdef _GLIBCXX_DEBUG
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(key_const_reference r_key, size_type hash) const
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#else
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(key_const_reference /*r_key*/, size_type hash) const
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#endif
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{
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_GLIBCXX_DEBUG_ASSERT(hash == hash_fn_base::operator()(r_key));
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return std::make_pair(comb_hash_fn_base::operator()(hash), hash);
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}
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#undef PB_DS_CLASS_T_DEC
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#undef PB_DS_CLASS_C_DEC
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#define PB_DS_CLASS_T_DEC \
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template<typename Key, typename _Alloc, typename Comb_Hash_Fn>
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#define PB_DS_CLASS_C_DEC \
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ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, false>
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/**
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* Specialization 3
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* The client does not supply a hash function (by specifying
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* null_type as the Hash_Fn parameter), and requests that hash
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* values not be stored.
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**/
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template<typename Key, typename _Alloc, typename Comb_Hash_Fn>
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class ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, false>
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: public Comb_Hash_Fn
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{
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protected:
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typedef typename _Alloc::size_type size_type;
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typedef Comb_Hash_Fn comb_hash_fn_base;
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ranged_hash_fn(size_type);
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ranged_hash_fn(size_type, const Comb_Hash_Fn&);
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ranged_hash_fn(size_type, const null_type&, const Comb_Hash_Fn&);
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void
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swap(PB_DS_CLASS_C_DEC&);
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};
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size)
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{ Comb_Hash_Fn::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size, const Comb_Hash_Fn& r_comb_hash_fn) :
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Comb_Hash_Fn(r_comb_hash_fn)
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{ }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size, const null_type& r_null_type,
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const Comb_Hash_Fn& r_comb_hash_fn)
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: Comb_Hash_Fn(r_comb_hash_fn)
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{ }
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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swap(PB_DS_CLASS_C_DEC& other)
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{ comb_hash_fn_base::swap(other); }
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#undef PB_DS_CLASS_T_DEC
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#undef PB_DS_CLASS_C_DEC
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#define PB_DS_CLASS_T_DEC \
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template<typename Key, typename _Alloc, typename Comb_Hash_Fn>
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#define PB_DS_CLASS_C_DEC \
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ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, true>
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/**
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* Specialization 4
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* The client does not supply a hash function (by specifying
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* null_type as the Hash_Fn parameter), and requests that hash
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* values be stored.
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**/
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template<typename Key, typename _Alloc, typename Comb_Hash_Fn>
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class ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, true>
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: public Comb_Hash_Fn
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{
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protected:
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typedef typename _Alloc::size_type size_type;
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typedef Comb_Hash_Fn comb_hash_fn_base;
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ranged_hash_fn(size_type);
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ranged_hash_fn(size_type, const Comb_Hash_Fn&);
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ranged_hash_fn(size_type, const null_type&, const Comb_Hash_Fn&);
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void
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swap(PB_DS_CLASS_C_DEC&);
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};
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size)
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{ Comb_Hash_Fn::notify_resized(size); }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size, const Comb_Hash_Fn& r_comb_hash_fn)
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: Comb_Hash_Fn(r_comb_hash_fn)
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{ }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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ranged_hash_fn(size_type size, const null_type& r_null_type,
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const Comb_Hash_Fn& r_comb_hash_fn)
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: Comb_Hash_Fn(r_comb_hash_fn)
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{ }
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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swap(PB_DS_CLASS_C_DEC& other)
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{ comb_hash_fn_base::swap(other); }
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#undef PB_DS_CLASS_T_DEC
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#undef PB_DS_CLASS_C_DEC
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} // namespace detail
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} // namespace __gnu_pbds
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#endif
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