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// -*- C++ -*-
// Copyright (C) 2005-2019 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 pairing_heap_/pairing_heap_.hpp
* Contains an implementation class for a pairing heap.
*/
/*
* Pairing heap:
* Michael L. Fredman, Robert Sedgewick, Daniel Dominic Sleator,
* and Robert Endre Tarjan, The Pairing Heap:
* A New Form of Self-Adjusting Heap, Algorithmica, 1(1):111-129, 1986.
*/
#include <ext/pb_ds/detail/cond_dealtor.hpp>
#include <ext/pb_ds/detail/type_utils.hpp>
#include <ext/pb_ds/detail/left_child_next_sibling_heap_/left_child_next_sibling_heap_.hpp>
#include <debug/debug.h>
namespace __gnu_pbds
{
namespace detail
{
#define PB_DS_CLASS_T_DEC \
template<typename Value_Type, typename Cmp_Fn, typename _Alloc>
#define PB_DS_CLASS_C_DEC \
pairing_heap<Value_Type, Cmp_Fn, _Alloc>
#ifdef _GLIBCXX_DEBUG
#define PB_DS_P_HEAP_BASE \
left_child_next_sibling_heap<Value_Type, Cmp_Fn, null_type, _Alloc, false>
#else
#define PB_DS_P_HEAP_BASE \
left_child_next_sibling_heap<Value_Type, Cmp_Fn, null_type, _Alloc>
#endif
/**
* Pairing heap.
*
* @ingroup heap-detail
*/
template<typename Value_Type, typename Cmp_Fn, typename _Alloc>
class pairing_heap : public PB_DS_P_HEAP_BASE
{
private:
typedef PB_DS_P_HEAP_BASE base_type;
typedef typename base_type::node_pointer node_pointer;
typedef typename _Alloc::template rebind<Value_Type>::other __rebind_a;
public:
typedef Value_Type value_type;
typedef Cmp_Fn cmp_fn;
typedef _Alloc allocator_type;
typedef typename _Alloc::size_type size_type;
typedef typename _Alloc::difference_type difference_type;
typedef typename __rebind_a::pointer pointer;
typedef typename __rebind_a::const_pointer const_pointer;
typedef typename __rebind_a::reference reference;
typedef typename __rebind_a::const_reference const_reference;
typedef typename base_type::point_const_iterator point_const_iterator;
typedef typename base_type::point_iterator point_iterator;
typedef typename base_type::const_iterator const_iterator;
typedef typename base_type::iterator iterator;
pairing_heap();
pairing_heap(const Cmp_Fn&);
pairing_heap(const pairing_heap&);
void
swap(pairing_heap&);
~pairing_heap();
inline point_iterator
push(const_reference);
void
modify(point_iterator, const_reference);
inline const_reference
top() const;
void
pop();
void
erase(point_iterator);
template<typename Pred>
size_type
erase_if(Pred);
template<typename Pred>
void
split(Pred, pairing_heap&);
void
join(pairing_heap&);
protected:
template<typename It>
void
copy_from_range(It, It);
#ifdef _GLIBCXX_DEBUG
void
assert_valid(const char*, int) const;
#endif
private:
inline void
push_imp(node_pointer);
node_pointer
join_node_children(node_pointer);
node_pointer
forward_join(node_pointer, node_pointer);
node_pointer
back_join(node_pointer, node_pointer);
void
remove_node(node_pointer);
};
#define PB_DS_ASSERT_NODE_CONSISTENT(_Node, _Bool) \
_GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(_Node, _Bool, \
__FILE__, __LINE__);)
#include <ext/pb_ds/detail/pairing_heap_/constructors_destructor_fn_imps.hpp>
#include <ext/pb_ds/detail/pairing_heap_/debug_fn_imps.hpp>
#include <ext/pb_ds/detail/pairing_heap_/find_fn_imps.hpp>
#include <ext/pb_ds/detail/pairing_heap_/insert_fn_imps.hpp>
#include <ext/pb_ds/detail/pairing_heap_/erase_fn_imps.hpp>
#include <ext/pb_ds/detail/pairing_heap_/split_join_fn_imps.hpp>
#undef PB_DS_ASSERT_NODE_CONSISTENT
#undef PB_DS_CLASS_C_DEC
#undef PB_DS_CLASS_T_DEC
#undef PB_DS_P_HEAP_BASE
} // namespace detail
} // namespace __gnu_pbds
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