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<h1>TreeBuilder.cpp</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/* </span>
00002 <span class="comment"> * Copyright (C) 2005 Maarten Keijzer</span>
00003 <span class="comment"> *</span>
00004 <span class="comment"> * This program is free software; you can redistribute it and/or modify</span>
00005 <span class="comment"> * it under the terms of version 2 of the GNU General Public License as </span>
00006 <span class="comment"> * published by the Free Software Foundation. </span>
00007 <span class="comment"> *</span>
00008 <span class="comment"> * This program is distributed in the hope that it will be useful,</span>
00009 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
00010 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
00011 <span class="comment"> * GNU General Public License for more details.</span>
00012 <span class="comment"> *</span>
00013 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
00014 <span class="comment"> * along with this program; if not, write to the Free Software</span>
00015 <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
00016 <span class="comment"> */</span>
00017
00018 <span class="preprocessor">#include &lt;utils/eoRNG.h&gt;</span>
00019 <span class="preprocessor">#include "TreeBuilder.h"</span>
00020
00021 Sym TreeBuilder::make_terminal()<span class="keyword"> const </span>{
00022 <span class="keywordflow">if</span> (rng.<a class="code" href="classeo_rng.html#a6">flip</a>(vcprob)) {
00023 <span class="keywordflow">return</span> table.get_random_var();
00024 }
00025
00026 <span class="keywordflow">return</span> table.get_random_const();
00027 }
00028
00029 Sym TreeBuilder::build_tree(<span class="keywordtype">unsigned</span> max_depth, <span class="keywordtype">bool</span> grow)<span class="keyword"> const </span>{
00030 <span class="keywordflow">if</span> (max_depth == 0 || grow &amp;&amp; rng.<a class="code" href="classeo_rng.html#a5">random</a>(2) == 0) {
00031 <span class="keywordflow">return</span> make_terminal();
00032 }
00033
00034 <span class="comment">// pick a random function, no matter what arity</span>
00035
00036 functor_t func = table.get_random_function();
00037
00038 SymVec args(func.arity);
00039
00040 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; args.size(); ++i) {
00041 args[i] = build_tree(max_depth-1, grow);
00042 }
00043
00044 <span class="keywordflow">return</span> Sym(func.token, args);
00045 }
00046
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