VariableDependencyGraph.cc

/*
 * Copyright © 2009-2020 Dynare Team
 *
 * This file is part of Dynare.
 *
 * Dynare 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 of the License, or
 * (at your option) any later version.
 *
 * Dynare 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <iostream>
#include <algorithm>

#include "VariableDependencyGraph.hh"

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wold-style-cast"
#pragma GCC diagnostic ignored "-Wsign-compare"
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#include <boost/graph/strong_components.hpp>
#include <boost/graph/topological_sort.hpp>
#pragma GCC diagnostic pop

using namespace boost;

VariableDependencyGraph::VariableDependencyGraph(int n) : base(n)
{
  /* It is necessary to manually initialize the vertex_index property since
     this graph uses listS and not vecS as underlying vertex container */
  auto v_index = get(vertex_index, *this);
  for (int i = 0; i < n; i++)
    put(v_index, vertex(i, *this), i);
}

void
VariableDependencyGraph::suppress(vertex_descriptor vertex_to_eliminate)
{
  clear_vertex(vertex_to_eliminate, *this);
  remove_vertex(vertex_to_eliminate, *this);
}

void
VariableDependencyGraph::suppress(int vertex_num)
{
  suppress(vertex(vertex_num, *this));
}

void
VariableDependencyGraph::eliminate(vertex_descriptor vertex_to_eliminate)
{
  if (in_degree(vertex_to_eliminate, *this) > 0 && out_degree(vertex_to_eliminate, *this) > 0)
    for (auto [it_in, in_end] = in_edges(vertex_to_eliminate, *this); it_in != in_end; ++it_in)
      for (auto [it_out, out_end] = out_edges(vertex_to_eliminate, *this); it_out != out_end; ++it_out)
        if (auto [ed, exist] = edge(source(*it_in, *this), target(*it_out, *this), *this);
            !exist)
          add_edge(source(*it_in, *this), target(*it_out, *this), *this);

  suppress(vertex_to_eliminate);
}

bool