40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
/*
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* Copyright (C) 2005 Maarten Keijzer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "NodeSelector.h"
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#include "Sym.h"
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#include <utils/eoRNG.h>
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unsigned RandomNodeSelector::select_node(Sym sym) const {
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return rng.random(sym.size());
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}
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unsigned BiasedNodeSelector::select_node(Sym sym) const {
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unsigned p = rng.random(sym.size());
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for (unsigned i = 0; i < nRounds; ++i) {
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Sym res = get_subtree(sym, p);
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if (res.args().size() > 0) break;
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p = rng.random(sym.size());
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}
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return p;
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}
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