Edit File: ranged_hash_fn.hpp
// -*- C++ -*- // Copyright (C) 2005-2018 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 ranged_hash_fn.hpp * Contains a unified ranged hash functor, allowing the hash tables * to deal with a single class for ranged hashing. */ #ifndef PB_DS_RANGED_HASH_FN_HPP #define PB_DS_RANGED_HASH_FN_HPP #include <utility> #include <debug/debug.h> namespace __gnu_pbds { namespace detail { /// Primary template. template<typename Key, typename Hash_Fn, typename _Alloc, typename Comb_Hash_Fn, bool Store_Hash> class ranged_hash_fn; #define PB_DS_CLASS_T_DEC \ template<typename Key, typename Hash_Fn, typename _Alloc, \ typename Comb_Hash_Fn> #define PB_DS_CLASS_C_DEC \ ranged_hash_fn<Key, Hash_Fn, _Alloc, Comb_Hash_Fn, false> /** * Specialization 1 * The client supplies a hash function and a ranged hash function, * and requests that hash values not be stored. **/ template<typename Key, typename Hash_Fn, typename _Alloc, typename Comb_Hash_Fn> class ranged_hash_fn< Key, Hash_Fn, _Alloc, Comb_Hash_Fn, false> : public Hash_Fn, public Comb_Hash_Fn { protected: typedef typename _Alloc::size_type size_type; typedef Hash_Fn hash_fn_base; typedef Comb_Hash_Fn comb_hash_fn_base; typedef typename _Alloc::template rebind< Key>::other key_allocator; typedef typename key_allocator::const_reference key_const_reference; ranged_hash_fn(size_type); ranged_hash_fn(size_type, const Hash_Fn&); ranged_hash_fn(size_type, const Hash_Fn&, const Comb_Hash_Fn&); void swap(PB_DS_CLASS_C_DEC&); void notify_resized(size_type); inline size_type operator()(key_const_reference) const; }; PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size) { Comb_Hash_Fn::notify_resized(size); } PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn) : Hash_Fn(r_hash_fn) { Comb_Hash_Fn::notify_resized(size); } PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn, const Comb_Hash_Fn& r_comb_hash_fn) : Hash_Fn(r_hash_fn), Comb_Hash_Fn(r_comb_hash_fn) { comb_hash_fn_base::notify_resized(size); } PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: swap(PB_DS_CLASS_C_DEC& other) { comb_hash_fn_base::swap(other); std::swap((Hash_Fn& )(*this), (Hash_Fn& )other); } PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: notify_resized(size_type size) { comb_hash_fn_base::notify_resized(size); } PB_DS_CLASS_T_DEC inline typename PB_DS_CLASS_C_DEC::size_type PB_DS_CLASS_C_DEC:: operator()(key_const_reference r_key) const { return (comb_hash_fn_base::operator()(hash_fn_base::operator()(r_key)));} #undef PB_DS_CLASS_T_DEC #undef PB_DS_CLASS_C_DEC #define PB_DS_CLASS_T_DEC \ template<typename Key, typename Hash_Fn, typename _Alloc, \ typename Comb_Hash_Fn> #define PB_DS_CLASS_C_DEC \ ranged_hash_fn<Key,Hash_Fn, _Alloc, Comb_Hash_Fn, true> /** * Specialization 2 * The client supplies a hash function and a ranged hash function, * and requests that hash values be stored. **/ template<typename Key, typename Hash_Fn, typename _Alloc, typename Comb_Hash_Fn> class ranged_hash_fn<Key, Hash_Fn, _Alloc, Comb_Hash_Fn, true> : public Hash_Fn, public Comb_Hash_Fn { protected: typedef typename _Alloc::size_type size_type; typedef std::pair<size_type, size_type> comp_hash; typedef Hash_Fn hash_fn_base; typedef Comb_Hash_Fn comb_hash_fn_base; typedef typename _Alloc::template rebind<Key>::other key_allocator; typedef typename key_allocator::const_reference key_const_reference; ranged_hash_fn(size_type); ranged_hash_fn(size_type, const Hash_Fn&); ranged_hash_fn(size_type, const Hash_Fn&, const Comb_Hash_Fn&); void swap(PB_DS_CLASS_C_DEC&); void notify_resized(size_type); inline comp_hash operator()(key_const_reference) const; inline comp_hash operator()(key_const_reference, size_type) const; }; PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size) { Comb_Hash_Fn::notify_resized(size); } PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn) : Hash_Fn(r_hash_fn) { Comb_Hash_Fn::notify_resized(size); } PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn, const Comb_Hash_Fn& r_comb_hash_fn) : Hash_Fn(r_hash_fn), Comb_Hash_Fn(r_comb_hash_fn) { comb_hash_fn_base::notify_resized(size); } PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: swap(PB_DS_CLASS_C_DEC& other) { comb_hash_fn_base::swap(other); std::swap((Hash_Fn& )(*this), (Hash_Fn& )other); } PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: notify_resized(size_type size) { comb_hash_fn_base::notify_resized(size); } PB_DS_CLASS_T_DEC inline typename PB_DS_CLASS_C_DEC::comp_hash PB_DS_CLASS_C_DEC:: operator()(key_const_reference r_key) const { const size_type hash = hash_fn_base::operator()(r_key); return std::make_pair(comb_hash_fn_base::operator()(hash), hash); } PB_DS_CLASS_T_DEC inline typename PB_DS_CLASS_C_DEC::comp_hash PB_DS_CLASS_C_DEC:: operator() #ifdef _GLIBCXX_DEBUG (key_const_reference r_key, size_type hash) const #else (key_const_reference /*r_key*/, size_type hash) const #endif { _GLIBCXX_DEBUG_ASSERT(hash == hash_fn_base::operator()(r_key)); return std::make_pair(comb_hash_fn_base::operator()(hash), hash); } #undef PB_DS_CLASS_T_DEC #undef PB_DS_CLASS_C_DEC #define PB_DS_CLASS_T_DEC \ template<typename Key, typename _Alloc, typename Comb_Hash_Fn> #define PB_DS_CLASS_C_DEC \ ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, false> /** * Specialization 3 * The client does not supply a hash function (by specifying * null_type as the Hash_Fn parameter), and requests that hash * values not be stored. **/ template<typename Key, typename _Alloc, typename Comb_Hash_Fn> class ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, false> : public Comb_Hash_Fn { protected: typedef typename _Alloc::size_type size_type; typedef Comb_Hash_Fn comb_hash_fn_base; ranged_hash_fn(size_type); ranged_hash_fn(size_type, const Comb_Hash_Fn&); ranged_hash_fn(size_type, const null_type&, const Comb_Hash_Fn&); void swap(PB_DS_CLASS_C_DEC&); }; PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size) { Comb_Hash_Fn::notify_resized(size); } PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size, const Comb_Hash_Fn& r_comb_hash_fn) : Comb_Hash_Fn(r_comb_hash_fn) { } PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size, const null_type& r_null_type, const Comb_Hash_Fn& r_comb_hash_fn) : Comb_Hash_Fn(r_comb_hash_fn) { } PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: swap(PB_DS_CLASS_C_DEC& other) { comb_hash_fn_base::swap(other); } #undef PB_DS_CLASS_T_DEC #undef PB_DS_CLASS_C_DEC #define PB_DS_CLASS_T_DEC \ template<typename Key, typename _Alloc, typename Comb_Hash_Fn> #define PB_DS_CLASS_C_DEC \ ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, true> /** * Specialization 4 * The client does not supply a hash function (by specifying * null_type as the Hash_Fn parameter), and requests that hash * values be stored. **/ template<typename Key, typename _Alloc, typename Comb_Hash_Fn> class ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, true> : public Comb_Hash_Fn { protected: typedef typename _Alloc::size_type size_type; typedef Comb_Hash_Fn comb_hash_fn_base; ranged_hash_fn(size_type); ranged_hash_fn(size_type, const Comb_Hash_Fn&); ranged_hash_fn(size_type, const null_type&, const Comb_Hash_Fn&); void swap(PB_DS_CLASS_C_DEC&); }; PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size) { Comb_Hash_Fn::notify_resized(size); } PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size, const Comb_Hash_Fn& r_comb_hash_fn) : Comb_Hash_Fn(r_comb_hash_fn) { } PB_DS_CLASS_T_DEC PB_DS_CLASS_C_DEC:: ranged_hash_fn(size_type size, const null_type& r_null_type, const Comb_Hash_Fn& r_comb_hash_fn) : Comb_Hash_Fn(r_comb_hash_fn) { } PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: swap(PB_DS_CLASS_C_DEC& other) { comb_hash_fn_base::swap(other); } #undef PB_DS_CLASS_T_DEC #undef PB_DS_CLASS_C_DEC } // namespace detail } // namespace __gnu_pbds #endif
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