--- /dev/null
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2009, 2011 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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