exhaustive_loop.hh 1.96 KB
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// graph-tool -- a general graph modification and manipulation thingy
//
// Copyright (C) 2006-2016 Tiago de Paula Peixoto <tiago@skewed.de>
//
// This program 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.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.

#ifndef EXHAUSTIVE_LOOP_HH
#define EXHAUSTIVE_LOOP_HH

#include "config.h"

namespace graph_tool
{

template <class ExhaustiveState, class Callback>
void exhaustive_sweep(ExhaustiveState& state, Callback&& callback)
{
    auto& vlist = state._vlist;

    double& S = state._S;
    double& S_min = state._S_min;

    size_t pos = 0;
    size_t B = state.get_B();
    size_t count = 0;

    callback(state);
    while (pos < vlist.size())
    {
        auto v = vlist[pos];
        size_t r = state.node_state(v);
        if (r < B - 1)
        {
            S += state.virtual_move_dS(pos, r + 1);
            state.perform_move(pos, r + 1);
            if (S < S_min)
            {
                S_min = S;
                parallel_vertex_loop
                    (state._g,
                     [&](auto v){ state._b_min[v] = state.node_state(v); });
            }
            pos = 0;
            callback(state);
            count++;
            if (count == state._max_iter)
                break;
        }
        else
        {
            S += state.virtual_move_dS(pos, 0);
            state.perform_move(pos, 0);
            pos++;
        }
    }
}

} // graph_tool namespace

#endif //EXHAUSTIVE_LOOP_HH