405 lines
11 KiB
C++
405 lines
11 KiB
C++
// boost heap: wrapper for stl heap
|
|
//
|
|
// Copyright (C) 2010 Tim Blechmann
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See
|
|
// accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#ifndef BOOST_HEAP_PRIORITY_QUEUE_HPP
|
|
#define BOOST_HEAP_PRIORITY_QUEUE_HPP
|
|
|
|
#include <algorithm>
|
|
#include <queue>
|
|
#include <vector>
|
|
|
|
#include <boost/assert.hpp>
|
|
|
|
#include <boost/heap/detail/heap_comparison.hpp>
|
|
#include <boost/heap/detail/stable_heap.hpp>
|
|
|
|
namespace boost {
|
|
namespace heap {
|
|
namespace detail {
|
|
|
|
typedef parameter::parameters<boost::parameter::optional<tag::allocator>,
|
|
boost::parameter::optional<tag::compare>,
|
|
boost::parameter::optional<tag::stable>,
|
|
boost::parameter::optional<tag::stability_counter_type>
|
|
> priority_queue_signature;
|
|
}
|
|
|
|
/**
|
|
* \class priority_queue
|
|
* \brief priority queue, based on stl heap functions
|
|
*
|
|
* The priority_queue class is a wrapper for the stl heap functions.<br>
|
|
* The template parameter T is the type to be managed by the container.
|
|
* The user can specify additional options and if no options are provided default options are used.
|
|
*
|
|
* The container supports the following options:
|
|
* - \c boost::heap::compare<>, defaults to \c compare<std::less<T> >
|
|
* - \c boost::heap::stable<>, defaults to \c stable<false>
|
|
* - \c boost::heap::stability_counter_type<>, defaults to \c stability_counter_type<boost::uintmax_t>
|
|
* - \c boost::heap::allocator<>, defaults to \c allocator<std::allocator<T> >
|
|
*
|
|
*/
|
|
#ifdef BOOST_DOXYGEN_INVOKED
|
|
template<class T, class ...Options>
|
|
#else
|
|
template <typename T,
|
|
class A0 = boost::parameter::void_,
|
|
class A1 = boost::parameter::void_,
|
|
class A2 = boost::parameter::void_,
|
|
class A3 = boost::parameter::void_
|
|
>
|
|
#endif
|
|
class priority_queue:
|
|
private detail::make_heap_base<T, typename detail::priority_queue_signature::bind<A0, A1, A2, A3>::type, false>::type
|
|
{
|
|
typedef detail::make_heap_base<T, typename detail::priority_queue_signature::bind<A0, A1, A2, A3>::type, false> heap_base_maker;
|
|
|
|
typedef typename heap_base_maker::type super_t;
|
|
typedef typename super_t::internal_type internal_type;
|
|
typedef typename heap_base_maker::allocator_argument::template rebind<internal_type>::other internal_type_allocator;
|
|
typedef std::vector<internal_type, internal_type_allocator> container_type;
|
|
|
|
template <typename Heap1, typename Heap2>
|
|
friend struct detail::heap_merge_emulate;
|
|
|
|
container_type q_;
|
|
|
|
#ifndef BOOST_DOXYGEN_INVOKED
|
|
struct implementation_defined:
|
|
detail::extract_allocator_types<typename heap_base_maker::allocator_argument>
|
|
{
|
|
typedef typename heap_base_maker::compare_argument value_compare;
|
|
typedef detail::stable_heap_iterator<T, typename container_type::const_iterator, super_t> iterator;
|
|
typedef iterator const_iterator;
|
|
typedef typename container_type::allocator_type allocator_type;
|
|
};
|
|
#endif
|
|
|
|
public:
|
|
typedef T value_type;
|
|
typedef typename implementation_defined::size_type size_type;
|
|
typedef typename implementation_defined::difference_type difference_type;
|
|
typedef typename implementation_defined::value_compare value_compare;
|
|
typedef typename implementation_defined::allocator_type allocator_type;
|
|
typedef typename implementation_defined::reference reference;
|
|
typedef typename implementation_defined::const_reference const_reference;
|
|
typedef typename implementation_defined::pointer pointer;
|
|
typedef typename implementation_defined::const_pointer const_pointer;
|
|
/**
|
|
* \b Note: The iterator does not traverse the priority queue in order of the priorities.
|
|
* */
|
|
typedef typename implementation_defined::iterator iterator;
|
|
typedef typename implementation_defined::const_iterator const_iterator;
|
|
|
|
static const bool constant_time_size = true;
|
|
static const bool has_ordered_iterators = false;
|
|
static const bool is_mergable = false;
|
|
static const bool is_stable = heap_base_maker::is_stable;
|
|
static const bool has_reserve = true;
|
|
|
|
/**
|
|
* \b Effects: constructs an empty priority queue.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
explicit priority_queue(value_compare const & cmp = value_compare()):
|
|
super_t(cmp)
|
|
{}
|
|
|
|
/**
|
|
* \b Effects: copy-constructs priority queue from rhs.
|
|
*
|
|
* \b Complexity: Linear.
|
|
*
|
|
* */
|
|
priority_queue (priority_queue const & rhs):
|
|
super_t(rhs), q_(rhs.q_)
|
|
{}
|
|
|
|
#ifdef BOOST_HAS_RVALUE_REFS
|
|
/**
|
|
* \b Effects: C++11-style move constructor.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* \b Note: Only available, if BOOST_HAS_RVALUE_REFS is defined
|
|
* */
|
|
priority_queue(priority_queue && rhs):
|
|
super_t(std::move(rhs)), q_(std::move(rhs.q_))
|
|
{}
|
|
|
|
/**
|
|
* \b Effects: C++11-style move assignment.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* \b Note: Only available, if BOOST_HAS_RVALUE_REFS is defined
|
|
* */
|
|
priority_queue & operator=(priority_queue && rhs)
|
|
{
|
|
super_t::operator=(std::move(rhs));
|
|
q_ = std::move(rhs.q_);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* \b Effects: Assigns priority queue from rhs.
|
|
*
|
|
* \b Complexity: Linear.
|
|
*
|
|
* */
|
|
priority_queue & operator=(priority_queue const & rhs)
|
|
{
|
|
static_cast<super_t&>(*this) = static_cast<super_t const &>(rhs);
|
|
q_ = rhs.q_;
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Returns true, if the priority queue contains no elements.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
bool empty(void) const
|
|
{
|
|
return q_.empty();
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Returns the number of elements contained in the priority queue.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
size_type size(void) const
|
|
{
|
|
return q_.size();
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Returns the maximum number of elements the priority queue can contain.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
size_type max_size(void) const
|
|
{
|
|
return q_.max_size();
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Removes all elements from the priority queue.
|
|
*
|
|
* \b Complexity: Linear.
|
|
*
|
|
* */
|
|
void clear(void)
|
|
{
|
|
q_.clear();
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Returns allocator.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
allocator_type get_allocator(void) const
|
|
{
|
|
return q_.get_allocator();
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Returns a const_reference to the maximum element.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
const_reference top(void) const
|
|
{
|
|
BOOST_ASSERT(!empty());
|
|
return super_t::get_value(q_.front());
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Adds a new element to the priority queue.
|
|
*
|
|
* \b Complexity: Logarithmic (amortized). Linear (worst case).
|
|
*
|
|
* */
|
|
void push(value_type const & v)
|
|
{
|
|
q_.push_back(super_t::make_node(v));
|
|
std::push_heap(q_.begin(), q_.end(), static_cast<super_t const &>(*this));
|
|
}
|
|
|
|
#if defined(BOOST_HAS_RVALUE_REFS) && !defined(BOOST_NO_VARIADIC_TEMPLATES)
|
|
/**
|
|
* \b Effects: Adds a new element to the priority queue. The element is directly constructed in-place.
|
|
*
|
|
* \b Complexity: Logarithmic (amortized). Linear (worst case).
|
|
*
|
|
* */
|
|
template <class... Args>
|
|
void emplace(Args&&... args)
|
|
{
|
|
q_.emplace_back(super_t::make_node(std::forward<Args>(args)...));
|
|
std::push_heap(q_.begin(), q_.end(), static_cast<super_t const &>(*this));
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* \b Effects: Removes the top element from the priority queue.
|
|
*
|
|
* \b Complexity: Logarithmic (amortized). Linear (worst case).
|
|
*
|
|
* */
|
|
void pop(void)
|
|
{
|
|
BOOST_ASSERT(!empty());
|
|
std::pop_heap(q_.begin(), q_.end(), static_cast<super_t const &>(*this));
|
|
q_.pop_back();
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Swaps two priority queues.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
void swap(priority_queue & rhs)
|
|
{
|
|
super_t::swap(rhs);
|
|
q_.swap(rhs.q_);
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Returns an iterator to the first element contained in the priority queue.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
iterator begin(void) const
|
|
{
|
|
return iterator(q_.begin());
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Returns an iterator to the end of the priority queue.
|
|
*
|
|
* \b Complexity: Constant.
|
|
*
|
|
* */
|
|
iterator end(void) const
|
|
{
|
|
return iterator(q_.end());
|
|
}
|
|
|
|
/**
|
|
* \b Effects: Reserves memory for element_count elements
|
|
*
|
|
* \b Complexity: Linear.
|
|
*
|
|
* \b Node: Invalidates iterators
|
|
*
|
|
* */
|
|
void reserve(size_type element_count)
|
|
{
|
|
q_.reserve(element_count);
|
|
}
|
|
|
|
/**
|
|
* \b Effect: Returns the value_compare object used by the priority queue
|
|
*
|
|
* */
|
|
value_compare const & value_comp(void) const
|
|
{
|
|
return super_t::value_comp();
|
|
}
|
|
|
|
/**
|
|
* \b Returns: Element-wise comparison of heap data structures
|
|
*
|
|
* \b Requirement: the \c value_compare object of both heaps must match.
|
|
*
|
|
* */
|
|
template <typename HeapType>
|
|
bool operator<(HeapType const & rhs) const
|
|
{
|
|
return detail::heap_compare(*this, rhs);
|
|
}
|
|
|
|
/**
|
|
* \b Returns: Element-wise comparison of heap data structures
|
|
*
|
|
* \b Requirement: the \c value_compare object of both heaps must match.
|
|
*
|
|
* */
|
|
template <typename HeapType>
|
|
bool operator>(HeapType const & rhs) const
|
|
{
|
|
return detail::heap_compare(rhs, *this);
|
|
}
|
|
|
|
/**
|
|
* \b Returns: Element-wise comparison of heap data structures
|
|
*
|
|
* \b Requirement: the \c value_compare object of both heaps must match.
|
|
*
|
|
* */
|
|
template <typename HeapType>
|
|
bool operator>=(HeapType const & rhs) const
|
|
{
|
|
return !operator<(rhs);
|
|
}
|
|
|
|
/**
|
|
* \b Returns: Element-wise comparison of heap data structures
|
|
*
|
|
* \b Requirement: the \c value_compare object of both heaps must match.
|
|
*
|
|
* */
|
|
template <typename HeapType>
|
|
bool operator<=(HeapType const & rhs) const
|
|
{
|
|
return !operator>(rhs);
|
|
}
|
|
|
|
/** \brief Equivalent comparison
|
|
* \b Returns: True, if both heap data structures are equivalent.
|
|
*
|
|
* \b Requirement: the \c value_compare object of both heaps must match.
|
|
*
|
|
* */
|
|
template <typename HeapType>
|
|
bool operator==(HeapType const & rhs) const
|
|
{
|
|
return detail::heap_equality(*this, rhs);
|
|
}
|
|
|
|
/** \brief Equivalent comparison
|
|
* \b Returns: True, if both heap data structures are not equivalent.
|
|
*
|
|
* \b Requirement: the \c value_compare object of both heaps must match.
|
|
*
|
|
* */
|
|
template <typename HeapType>
|
|
bool operator!=(HeapType const & rhs) const
|
|
{
|
|
return !(*this == rhs);
|
|
}
|
|
};
|
|
|
|
} /* namespace heap */
|
|
} /* namespace boost */
|
|
|
|
#endif /* BOOST_HEAP_PRIORITY_QUEUE_HPP */
|