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// -*- C++ -*-
// Copyright (C) 2005-2021 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
// 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
// <>.
// 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 priority_queue.hpp
* Contains priority_queues.
#include <bits/c++config.h>
#include <ext/pb_ds/tag_and_trait.hpp>
#include <ext/pb_ds/detail/priority_queue_base_dispatch.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>
namespace __gnu_pbds
* @defgroup heap-based Heap-Based
* @ingroup containers-pbds
* @{
* @defgroup heap-detail Base and Policy Classes
* @ingroup heap-based
* A priority queue composed of one specific heap policy.
* @tparam _Tv Value type.
* @tparam Cmp_Fn Comparison functor.
* @tparam Tag Instantiating data structure type,
* see container_tag.
* @tparam _Alloc Allocator type.
* Base is dispatched at compile time via Tag, from the following
* choices: binary_heap_tag, binomial_heap_tag, pairing_heap_tag,
* rc_binomial_heap_tag, thin_heap_tag
* Base choices are: detail::binary_heap, detail::binomial_heap,
* detail::pairing_heap, detail::rc_binomial_heap,
* detail::thin_heap.
template<typename _Tv,
typename Cmp_Fn = std::less<_Tv>,
typename Tag = pairing_heap_tag,
typename _Alloc = std::allocator<char> >
class priority_queue
: public detail::container_base_dispatch<_Tv, Cmp_Fn, _Alloc, Tag>::type
typedef _Tv value_type;
typedef Cmp_Fn cmp_fn;
typedef Tag container_category;
typedef _Alloc allocator_type;
typedef typename allocator_type::size_type size_type;
typedef typename allocator_type::difference_type difference_type;
typedef typename detail::container_base_dispatch<_Tv, Cmp_Fn, _Alloc,
typedef detail::rebind_traits<_Alloc, _Tv> __rebind_va;
typedef typename __rebind_va::reference reference;
typedef typename __rebind_va::const_reference const_reference;
typedef typename __rebind_va::pointer pointer;
typedef typename __rebind_va::const_pointer const_pointer;
typedef typename base_type::point_iterator point_iterator;
typedef typename base_type::point_const_iterator point_const_iterator;
typedef typename base_type::iterator iterator;
typedef typename base_type::const_iterator const_iterator;
priority_queue() { }
/// Constructor taking some policy objects. r_cmp_fn will be
/// copied by the Cmp_Fn object of the container object.
priority_queue(const cmp_fn& r_cmp_fn) : base_type(r_cmp_fn) { }
/// Constructor taking __iterators to a range of value_types. The
/// value_types between first_it and last_it will be inserted into
/// the container object.
template<typename It>
priority_queue(It first_it, It last_it)
{ base_type::copy_from_range(first_it, last_it); }
/// Constructor taking __iterators to a range of value_types and
/// some policy objects The value_types between first_it and
/// last_it will be inserted into the container object. r_cmp_fn
/// will be copied by the cmp_fn object of the container object.
template<typename It>
priority_queue(It first_it, It last_it, const cmp_fn& r_cmp_fn)
: base_type(r_cmp_fn)
{ base_type::copy_from_range(first_it, last_it); }
priority_queue(const priority_queue& other)
: base_type((const base_type& )other) { }
~priority_queue() { }
operator=(const priority_queue& other)
if (this != &other)
priority_queue tmp(other);
return *this;
swap(priority_queue& other)
{ base_type::swap(other); }
///@} heap-based
} // namespace __gnu_pbds