76 lines
2.1 KiB
C++
76 lines
2.1 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 <Sym.h>
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#include <NodeSelector.h>
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#include <eoSymCrossover.h>
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#include <utils/eoRNG.h>
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bool subtree_quad(Sym& a, Sym& b, NodeSelector& select) {
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unsigned i = select.select_node(a);
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unsigned j = select.select_node(b);
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Sym aprime = insert_subtree(a, i, get_subtree(b, j));
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Sym bprime = insert_subtree(b, j, get_subtree(a, i));
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a = aprime;
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b = bprime;
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return true;
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}
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bool subtree_bin(Sym& a, const Sym& b, NodeSelector& select) {
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unsigned i = select.select_node(a);
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unsigned j = select.select_node(b);
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a = insert_subtree(a, i, get_subtree(b,j));
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return true;
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}
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Sym homologous_binimpl(Sym a, Sym b) {
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bool use_a = rng.random(2);
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token_t head = (use_a? a : b).token();
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SymVec args = use_a?a.args() : b.args();
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const SymVec& a_args = a.args();
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const SymVec& b_args = b.args();
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unsigned mn = std::min(a_args.size(), b_args.size());
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bool changed = !use_a;
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for (unsigned i = 0; i < mn; ++i) {
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args[i] = homologous_binimpl(a_args[i], b_args[i]);
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if (args[i] != a_args[i]) {
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changed = true;
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}
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}
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return changed? Sym(head, args) : a;
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}
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bool homologous_bin(Sym& a, const Sym& b) {
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if (a==b) return false;
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Sym org = a;
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a = homologous_binimpl(a,b);
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return org != a;
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}
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