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/*=============================================================================
Copyright (c) 2010 Tim Blechmann
Use, modification and distribution is subject to 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)
=============================================================================*/
#include <iostream>
#include <iomanip>
#include "../../../boost/heap/fibonacci_heap.hpp"
using std::cout;
using std::endl;
using namespace boost::heap;
//[ basic_interface
// PriorityQueue is expected to be a max-heap of integer values
template <typename PriorityQueue>
void basic_interface(void)
{
PriorityQueue pq;
pq.push(2);
pq.push(3);
pq.push(1);
cout << "Priority Queue: popped elements" << endl;
cout << pq.top() << " "; // 3
pq.pop();
cout << pq.top() << " "; // 2
pq.pop();
cout << pq.top() << " "; // 1
pq.pop();
cout << endl;
}
//]
//[ iterator_interface
// PriorityQueue is expected to be a max-heap of integer values
template <typename PriorityQueue>
void iterator_interface(void)
{
PriorityQueue pq;
pq.push(2);
pq.push(3);
pq.push(1);
typename PriorityQueue::iterator begin = pq.begin();
typename PriorityQueue::iterator end = pq.end();
cout << "Priority Queue: iteration" << endl;
for (typename PriorityQueue::iterator it = begin; it != end; ++it)
cout << *it << " "; // 1, 2, 3 in unspecified order
cout << endl;
}
//]
//[ ordered_iterator_interface
// PriorityQueue is expected to be a max-heap of integer values
template <typename PriorityQueue>
void ordered_iterator_interface(void)
{
PriorityQueue pq;
pq.push(2);
pq.push(3);
pq.push(1);
typename PriorityQueue::ordered_iterator begin = pq.ordered_begin();
typename PriorityQueue::ordered_iterator end = pq.ordered_end();
cout << "Priority Queue: ordered iteration" << endl;
for (typename PriorityQueue::ordered_iterator it = begin; it != end; ++it)
cout << *it << " "; // 3, 2, 1 (i.e. 1, 2, 3 in heap order)
cout << endl;
}
//]
//[ merge_interface
// PriorityQueue is expected to be a max-heap of integer values
template <typename PriorityQueue>
void merge_interface(void)
{
PriorityQueue pq;
pq.push(3);
pq.push(5);
pq.push(1);
PriorityQueue pq2;
pq2.push(2);
pq2.push(4);
pq2.push(0);
pq.merge(pq2);
cout << "Priority Queue: merge" << endl;
cout << "first queue: ";
while (!pq.empty()) {
cout << pq.top() << " "; // 5 4 3 2 1 0
pq.pop();
}
cout << endl;
cout << "second queue: ";
while (!pq2.empty()) {
cout << pq2.top() << " "; // 4 2 0
pq2.pop();
}
cout << endl;
}
//]
//[ heap_merge_algorithm
// PriorityQueue is expected to be a max-heap of integer values
template <typename PriorityQueue>
void heap_merge_algorithm(void)
{
PriorityQueue pq;
pq.push(3);
pq.push(5);
pq.push(1);
PriorityQueue pq2;
pq2.push(2);
pq2.push(4);
pq2.push(0);
boost::heap::heap_merge(pq, pq2);
cout << "Priority Queue: merge" << endl;
cout << "first queue: ";
while (!pq.empty()) {
cout << pq.top() << " "; // 5 4 3 2 1 0
pq.pop();
}
cout << endl;
cout << "second queue: ";
while (!pq2.empty()) {
cout << pq2.top() << " "; // 4 2 0
pq2.pop();
}
cout << endl;
}
//]
//[ mutable_interface
// PriorityQueue is expected to be a max-heap of integer values
template <typename PriorityQueue>
void mutable_interface(void)
{
PriorityQueue pq;
typedef typename PriorityQueue::handle_type handle_t;
handle_t t3 = pq.push(3);
handle_t t5 = pq.push(5);
handle_t t1 = pq.push(1);
pq.update(t3, 4);
pq.increase(t5, 7);
pq.decrease(t1, 0);
cout << "Priority Queue: update" << endl;
while (!pq.empty()) {
cout << pq.top() << " "; // 7, 4, 0
pq.pop();
}
cout << endl;
}
//]
//[ mutable_fixup_interface
// PriorityQueue is expected to be a max-heap of integer values
template <typename PriorityQueue>
void mutable_fixup_interface(void)
{
PriorityQueue pq;
typedef typename PriorityQueue::handle_type handle_t;
handle_t t3 = pq.push(3);
handle_t t5 = pq.push(5);
handle_t t1 = pq.push(1);
*t3 = 4;
pq.update(t3);
*t5 = 7;
pq.increase(t5);
*t1 = 0;
pq.decrease(t1);
cout << "Priority Queue: update with fixup" << endl;
while (!pq.empty()) {
cout << pq.top() << " "; // 7, 4, 0
pq.pop();
}
cout << endl;
}
//]
//[ mutable_interface_handle_in_value
struct heap_data
{
fibonacci_heap<heap_data>::handle_type handle;
int payload;
heap_data(int i):
payload(i)
{}
bool operator<(heap_data const & rhs) const
{
return payload < rhs.payload;
}
};
void mutable_interface_handle_in_value(void)
{
fibonacci_heap<heap_data> heap;
heap_data f(2);
fibonacci_heap<heap_data>::handle_type handle = heap.push(f);
(*handle).handle = handle; // store handle in node
}
//]
int main(void)
{
using boost::heap::fibonacci_heap;
cout << std::setw(2);
basic_interface<fibonacci_heap<int> >();
cout << endl;
iterator_interface<fibonacci_heap<int> >();
cout << endl;
ordered_iterator_interface<fibonacci_heap<int> >();
cout << endl;
merge_interface<fibonacci_heap<int> >();
cout << endl;
mutable_interface<fibonacci_heap<int> >();
cout << endl;
mutable_fixup_interface<fibonacci_heap<int> >();
mutable_interface_handle_in_value();
}
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