CPP/Boost/BGL/IndirectPriorityQueue

IndirectPriorityQueue.cpp

#include <iostream>
#include <iomanip>
 
#include <boost/graph/grid_graph.hpp>
#include <boost/graph/detail/d_ary_heap.hpp>
#include <boost/property_map/property_map.hpp>
 
#include <cstdlib>
 
int main(int, char*[])
{
  srand((unsigned int)time(NULL));
 
  boost::array<std::size_t, 2> lengths = { { 5,5 } };
  typedef boost::grid_graph<2> GraphType;
  GraphType graph(lengths);
  typedef boost::graph_traits<GraphType>::vertex_descriptor Vertex;
  typedef boost::property_map<GraphType, boost::vertex_index_t>::const_type GridIndexMapType;
  GridIndexMapType gridIndexMap(get(boost::vertex_index, graph));
 
  typedef boost::vector_property_map<std::size_t, GridIndexMapType> IndexInHeapMap;
  IndexInHeapMap index_in_heap(gridIndexMap);
 
  typedef boost::graph_traits<GraphType>::vertex_iterator VertexIteratorType;
 
  typedef boost::vector_property_map<float, GridIndexMapType> PriorityMapType;
  PriorityMapType priorityMap(gridIndexMap);
  VertexIteratorType vertexIterator, vertexIteratorEnd;
 
  typedef std::greater<float> ComparisonFunctor;
  typedef boost::d_ary_heap_indirect<Vertex, 4, IndexInHeapMap, PriorityMapType, ComparisonFunctor > MutableQueue;
 
  ComparisonFunctor comparisonFunctor;
  MutableQueue mutableQueue(priorityMap, index_in_heap, comparisonFunctor);
 
  std::cout << "There are " << mutableQueue.size() << " items in the queue." << std::endl;
 
  // Add random values to the vertices and add them to the queue
  for( tie(vertexIterator, vertexIteratorEnd) = vertices(graph); vertexIterator != vertexIteratorEnd; ++vertexIterator)
  {
    put(priorityMap, *vertexIterator, rand() % 1000);
  }
 
  for( tie(vertexIterator, vertexIteratorEnd) = vertices(graph); vertexIterator != vertexIteratorEnd; ++vertexIterator)
  {
    mutableQueue.push(*vertexIterator);
  }
 
  std::cout << "There are " << mutableQueue.size() << " items in the queue." << std::endl;
 
  // Insert another set of random values for each vertex
  for( tie(vertexIterator, vertexIteratorEnd) = vertices(graph); vertexIterator != vertexIteratorEnd; ++vertexIterator)
  {
    put(priorityMap, *vertexIterator, rand() % 1000);
  }
 
  for( tie(vertexIterator, vertexIteratorEnd) = vertices(graph); vertexIterator != vertexIteratorEnd; ++vertexIterator)
  {
    mutableQueue.push(*vertexIterator);
  }
 
  std::cout << "There are " << mutableQueue.size() << " items in the queue." << std::endl;
 
  std::cout << "The priority queue is: " << std::endl;
  while( ! mutableQueue.empty() )
  {
    Vertex u = mutableQueue.top();
 
    // These two lines are equivalent
    std::cout << "vertex: " << u[0] << " " << u[1] << " priority: " << get(priorityMap, u) << std::endl;
 
    mutableQueue.pop();
  }
 
  std::cout << std::endl;
 
  return 0;
}
 
/* Output:
There are 0 items in the queue.
There are 25 items in the queue.
There are 50 items in the queue.
The priority queue is: 
vertex: 2 4 priority: 967
vertex: 0 0 priority: 945
vertex: 0 0 priority: 945
vertex: 1 3 priority: 922
vertex: 0 2 priority: 907
vertex: 4 4 priority: 901
vertex: 2 4 priority: 967
vertex: 4 4 priority: 901
vertex: 0 1 priority: 858
vertex: 0 2 priority: 907
vertex: 0 1 priority: 858
vertex: 3 4 priority: 852
vertex: 3 4 priority: 852
vertex: 2 2 priority: 793
vertex: 2 2 priority: 793
vertex: 1 3 priority: 922
vertex: 1 1 priority: 791
vertex: 1 1 priority: 791
vertex: 4 2 priority: 781
vertex: 4 2 priority: 781
vertex: 1 2 priority: 748
vertex: 1 2 priority: 748
vertex: 2 3 priority: 734
vertex: 4 3 priority: 661
vertex: 4 3 priority: 661
vertex: 2 3 priority: 734
vertex: 3 3 priority: 652
vertex: 3 3 priority: 652
vertex: 3 2 priority: 529
vertex: 3 2 priority: 529
vertex: 3 0 priority: 493
vertex: 3 0 priority: 493
vertex: 2 0 priority: 488
vertex: 2 0 priority: 488
vertex: 4 1 priority: 450
vertex: 4 1 priority: 450
vertex: 4 0 priority: 346
vertex: 4 0 priority: 346
vertex: 0 3 priority: 328
vertex: 0 3 priority: 328
vertex: 1 4 priority: 245
vertex: 1 4 priority: 245
vertex: 1 0 priority: 216
vertex: 1 0 priority: 216
vertex: 0 4 priority: 64
vertex: 0 4 priority: 64
vertex: 2 1 priority: 47
vertex: 2 1 priority: 47
vertex: 3 1 priority: 14
vertex: 3 1 priority: 14
 
*/

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
 
Project(IndirectPriorityQueue)
 
set(Boost_USE_MULTITHREADED ON)
FIND_PACKAGE(Boost 1.38 COMPONENTS)
 
INCLUDE_DIRECTORIES(${INCLUDE_DIRECTORIES} ${Boost_INCLUDE_DIRS})
LINK_DIRECTORIES(${LINK_DIRECTORIES} ${Boost_LIBRARY_DIRS})
 
ADD_EXECUTABLE(IndirectPriorityQueue IndirectPriorityQueue.cpp)