--- /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 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 <ext/pb_ds/detail/left_child_next_sibling_heap_/null_metadata.hpp>
+#include <debug/debug.h>
+
+namespace __gnu_pbds
+{
+ namespace detail
+ {
+
+#define PB_DS_CLASS_T_DEC \
+ template<typename Value_Type, class Cmp_Fn, class Allocator>
+
+#define PB_DS_CLASS_C_DEC \
+ pairing_heap_<Value_Type, Cmp_Fn, Allocator>
+
+#ifdef _GLIBCXX_DEBUG
+#define PB_DS_BASE_C_DEC \
+ left_child_next_sibling_heap_< \
+ Value_Type, \
+ Cmp_Fn, \
+ null_left_child_next_sibling_heap_node_metadata, \
+ Allocator, \
+ false>
+#else
+#define PB_DS_BASE_C_DEC \
+ left_child_next_sibling_heap_< \
+ Value_Type, \
+ Cmp_Fn, \
+ null_left_child_next_sibling_heap_node_metadata, \
+ Allocator>
+#endif
+
+ /**
+ * class description = "P4ri|\|g h3ap$">
+ **/
+ template<typename Value_Type, class Cmp_Fn, class Allocator>
+ class pairing_heap_ : public PB_DS_BASE_C_DEC
+ {
+
+ private:
+ typedef PB_DS_BASE_C_DEC base_type;
+
+ typedef typename base_type::node_pointer node_pointer;
+
+ public:
+
+ typedef typename Allocator::size_type size_type;
+
+ typedef typename Allocator::difference_type difference_type;
+
+ typedef Value_Type value_type;
+
+ typedef
+ typename Allocator::template rebind<
+ value_type>::other::pointer
+ pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ value_type>::other::const_pointer
+ const_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ value_type>::other::reference
+ reference;
+
+ typedef
+ typename Allocator::template rebind<
+ value_type>::other::const_reference
+ const_reference;
+
+ typedef
+ typename PB_DS_BASE_C_DEC::const_point_iterator
+ const_point_iterator;
+
+ typedef typename PB_DS_BASE_C_DEC::point_iterator point_iterator;
+
+ typedef typename PB_DS_BASE_C_DEC::const_iterator const_iterator;
+
+ typedef typename PB_DS_BASE_C_DEC::iterator iterator;
+
+ typedef Cmp_Fn cmp_fn;
+
+ typedef Allocator allocator_type;
+
+
+ pairing_heap_();
+
+ pairing_heap_(const Cmp_Fn& r_cmp_fn);
+
+ pairing_heap_(const PB_DS_CLASS_C_DEC& other);
+
+ void
+ swap(PB_DS_CLASS_C_DEC& other);
+
+ ~pairing_heap_();
+
+ inline point_iterator
+ push(const_reference r_val);
+
+ void
+ modify(point_iterator it, const_reference r_new_val);
+
+ inline const_reference
+ top() const;
+
+ void
+ pop();
+
+ void
+ erase(point_iterator it);
+
+ template<typename Pred>
+ size_type
+ erase_if(Pred pred);
+
+ template<typename Pred>
+ void
+ split(Pred pred, PB_DS_CLASS_C_DEC& other);
+
+ void
+ join(PB_DS_CLASS_C_DEC& other);
+
+ protected:
+
+ template<typename It>
+ void
+ copy_from_range(It first_it, It last_it);
+
+#ifdef _GLIBCXX_DEBUG
+ void
+ assert_valid() const;
+#endif
+
+ private:
+
+ inline void
+ push_imp(node_pointer p_nd);
+
+ node_pointer
+ join_node_children(node_pointer p_nd);
+
+ node_pointer
+ forward_join(node_pointer p_nd, node_pointer p_next);
+
+ node_pointer
+ back_join(node_pointer p_nd, node_pointer p_next);
+
+ void
+ remove_node(node_pointer p_nd);
+
+ };
+
+#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_CLASS_C_DEC
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_BASE_C_DEC
+
+ } // namespace detail
+} // namespace __gnu_pbds
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