--- /dev/null
+// -*- 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 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 <ext/pb_ds/detail/basic_types.hpp>
+#include <utility>
+#include <debug/debug.h>
+
+namespace __gnu_pbds
+{
+ namespace detail
+ {
+ template<typename Key, typename Hash_Fn, typename Allocator,
+ typename Comb_Hash_Fn, bool Store_Hash>
+ class ranged_hash_fn;
+
+#define PB_DS_CLASS_T_DEC \
+ template<typename Key, typename Hash_Fn, typename Allocator, \
+ typename Comb_Hash_Fn>
+
+#define PB_DS_CLASS_C_DEC \
+ ranged_hash_fn<Key, Hash_Fn, Allocator, 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 Allocator,
+ typename Comb_Hash_Fn>
+ class ranged_hash_fn< Key, Hash_Fn, Allocator, Comb_Hash_Fn, false>
+ : public Hash_Fn, public Comb_Hash_Fn
+ {
+ protected:
+ typedef typename Allocator::size_type size_type;
+ typedef Hash_Fn hash_fn_base;
+ typedef Comb_Hash_Fn comb_hash_fn_base;
+ typedef typename Allocator::template rebind< Key>::other key_allocator;
+ typedef typename key_allocator::const_reference const_key_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()(const_key_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()(const_key_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 Allocator, \
+ typename Comb_Hash_Fn>
+
+#define PB_DS_CLASS_C_DEC \
+ ranged_hash_fn<Key,Hash_Fn, Allocator, 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 Allocator,
+ typename Comb_Hash_Fn>
+ class ranged_hash_fn<Key, Hash_Fn, Allocator, Comb_Hash_Fn, true>
+ : public Hash_Fn, public Comb_Hash_Fn
+ {
+ protected:
+ typedef typename Allocator::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 Allocator::template rebind<Key>::other key_allocator;
+ typedef typename key_allocator::const_reference const_key_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()(const_key_reference) const;
+
+ inline comp_hash
+ operator()(const_key_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()(const_key_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
+ (const_key_reference r_key, size_type hash) const
+#else
+ (const_key_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 Allocator, typename Comb_Hash_Fn>
+
+#define PB_DS_CLASS_C_DEC \
+ ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, false>
+
+ /**
+ * Specialization 3
+ * The client does not supply a hash function (by specifying
+ * null_hash_fn as the Hash_Fn parameter), and requests that hash
+ * values not be stored.
+ **/
+ template<typename Key, typename Allocator, typename Comb_Hash_Fn>
+ class ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, false>
+ : public null_hash_fn, public Comb_Hash_Fn
+ {
+ protected:
+ typedef typename Allocator::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_hash_fn&, 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_hash_fn& r_null_hash_fn,
+ 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 Allocator, typename Comb_Hash_Fn>
+
+#define PB_DS_CLASS_C_DEC \
+ ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, true>
+
+ /**
+ * Specialization 4
+ * The client does not supply a hash function (by specifying
+ * null_hash_fn as the Hash_Fn parameter), and requests that hash
+ * values be stored.
+ **/
+ template<typename Key, typename Allocator, typename Comb_Hash_Fn>
+ class ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, true>
+ : public null_hash_fn, public Comb_Hash_Fn
+ {
+ protected:
+ typedef typename Allocator::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_hash_fn&, 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_hash_fn& r_null_hash_fn,
+ 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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