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// -*- C++ -*- |
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// Copyright (C) 2005-2015 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. |
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// 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. |
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// 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. |
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// 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/>. |
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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 |
// 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. |
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/** |
* @file ranged_hash_fn.hpp |
* Contains a unified ranged hash functor, allowing the hash tables |
* to deal with a single class for ranged hashing. |
*/ |
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#ifndef PB_DS_RANGED_HASH_FN_HPP |
#define PB_DS_RANGED_HASH_FN_HPP |
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#include <utility> |
#include <debug/debug.h> |
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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; |
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#define PB_DS_CLASS_T_DEC \ |
template<typename Key, typename Hash_Fn, typename _Alloc, \ |
typename Comb_Hash_Fn> |
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#define PB_DS_CLASS_C_DEC \ |
ranged_hash_fn<Key, Hash_Fn, _Alloc, Comb_Hash_Fn, false> |
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/** |
* 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; |
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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 |
swap(PB_DS_CLASS_C_DEC&); |
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void |
notify_resized(size_type); |
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inline size_type |
operator()(key_const_reference) const; |
}; |
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PB_DS_CLASS_T_DEC |
PB_DS_CLASS_C_DEC:: |
ranged_hash_fn(size_type size) |
{ Comb_Hash_Fn::notify_resized(size); } |
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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); } |
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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); } |
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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); |
} |
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PB_DS_CLASS_T_DEC |
void |
PB_DS_CLASS_C_DEC:: |
notify_resized(size_type size) |
{ comb_hash_fn_base::notify_resized(size); } |
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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)));} |
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#undef PB_DS_CLASS_T_DEC |
#undef PB_DS_CLASS_C_DEC |
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#define PB_DS_CLASS_T_DEC \ |
template<typename Key, typename Hash_Fn, typename _Alloc, \ |
typename Comb_Hash_Fn> |
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#define PB_DS_CLASS_C_DEC \ |
ranged_hash_fn<Key,Hash_Fn, _Alloc, Comb_Hash_Fn, true> |
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/** |
* 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; |
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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 |
swap(PB_DS_CLASS_C_DEC&); |
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void |
notify_resized(size_type); |
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inline comp_hash |
operator()(key_const_reference) const; |
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inline comp_hash |
operator()(key_const_reference, size_type) const; |
}; |
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PB_DS_CLASS_T_DEC |
PB_DS_CLASS_C_DEC:: |
ranged_hash_fn(size_type size) |
{ Comb_Hash_Fn::notify_resized(size); } |
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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); } |
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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); } |
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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); |
} |
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PB_DS_CLASS_T_DEC |
void |
PB_DS_CLASS_C_DEC:: |
notify_resized(size_type size) |
{ comb_hash_fn_base::notify_resized(size); } |
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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); |
} |
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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); |
} |
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#undef PB_DS_CLASS_T_DEC |
#undef PB_DS_CLASS_C_DEC |
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#define PB_DS_CLASS_T_DEC \ |
template<typename Key, typename _Alloc, typename Comb_Hash_Fn> |
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#define PB_DS_CLASS_C_DEC \ |
ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, false> |
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/** |
* 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; |
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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 |
swap(PB_DS_CLASS_C_DEC&); |
}; |
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PB_DS_CLASS_T_DEC |
PB_DS_CLASS_C_DEC:: |
ranged_hash_fn(size_type size) |
{ Comb_Hash_Fn::notify_resized(size); } |
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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) |
{ } |
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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) |
{ } |
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PB_DS_CLASS_T_DEC |
void |
PB_DS_CLASS_C_DEC:: |
swap(PB_DS_CLASS_C_DEC& other) |
{ comb_hash_fn_base::swap(other); } |
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#undef PB_DS_CLASS_T_DEC |
#undef PB_DS_CLASS_C_DEC |
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#define PB_DS_CLASS_T_DEC \ |
template<typename Key, typename _Alloc, typename Comb_Hash_Fn> |
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#define PB_DS_CLASS_C_DEC \ |
ranged_hash_fn<Key, null_type, _Alloc, Comb_Hash_Fn, true> |
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/** |
* 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; |
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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 |
swap(PB_DS_CLASS_C_DEC&); |
}; |
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PB_DS_CLASS_T_DEC |
PB_DS_CLASS_C_DEC:: |
ranged_hash_fn(size_type size) |
{ Comb_Hash_Fn::notify_resized(size); } |
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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) |
{ } |
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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) |
{ } |
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PB_DS_CLASS_T_DEC |
void |
PB_DS_CLASS_C_DEC:: |
swap(PB_DS_CLASS_C_DEC& other) |
{ comb_hash_fn_base::swap(other); } |
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#undef PB_DS_CLASS_T_DEC |
#undef PB_DS_CLASS_C_DEC |
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} // namespace detail |
} // namespace __gnu_pbds |
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#endif |