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git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@40 331e1502-861f-0410-8da2-ba01fb791d7f
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<a class="el" href="dir_000020.html">app</a> / <a class="el" href="dir_000021.html">gpsymreg</a></div>
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<h1>node.h</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/*</span>
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00002 <span class="comment"> This library is free software; you can redistribute it and/or modify</span>
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00003 <span class="comment"> it under the terms of the GNU General Public License as published by</span>
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00004 <span class="comment"> the Free Software Foundation; either version 2 of the License, or</span>
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00005 <span class="comment"> (at your option) any later version.</span>
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00006 <span class="comment"> </span>
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00007 <span class="comment"> This library is distributed in the hope that it will be useful,</span>
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00008 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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00009 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
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00010 <span class="comment"> Lesser General Public License for more details.</span>
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00011 <span class="comment"> </span>
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00012 <span class="comment"> You should have received a copy of the GNU General Public License</span>
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00013 <span class="comment"> along with this library; if not, write to the Free Software</span>
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00014 <span class="comment"> Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
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00015 <span class="comment"> </span>
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00016 <span class="comment"> Contact: todos@geneura.ugr.es, http://geneura.ugr.es</span>
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00017 <span class="comment"> jeggermo@liacs.nl</span>
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00018 <span class="comment">*/</span>
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00019
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00020 <span class="preprocessor">#ifndef _NODE_H</span>
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00021 <span class="preprocessor"></span><span class="preprocessor">#define _NODE_H</span>
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00022 <span class="preprocessor"></span>
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00023
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00024
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00025 <span class="preprocessor">#include <iostream></span>
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00026 <span class="preprocessor">#include <string></span>
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00027 <span class="preprocessor">#include <cmath></span> <span class="comment">// for finite(double) function</span>
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00028
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00029 <span class="keyword">using</span> <span class="keyword">namespace </span>gp_parse_tree;
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00030 <span class="keyword">using</span> <span class="keyword">namespace </span>std;
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00031
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00032
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00033 <span class="comment">/* A new Operation and Node class for even more flexibility.</span>
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00034 <span class="comment"></span>
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00035 <span class="comment"> Improvements over the t-eoSymreg code are:</span>
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00036 <span class="comment"> </span>
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00037 <span class="comment"> * No hardcoded functions or operators. The Operation and Node class below</span>
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00038 <span class="comment"> allow you to specify your own unary and binary functions as well as</span>
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00039 <span class="comment"> binary operators (like +,-,*,/). Moreover you can detemine if you want</span>
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00040 <span class="comment"> to allow primitve subroutines with either one or two arguments.</span>
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00041 <span class="comment"> </span>
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00042 <span class="comment"> If a Node has a subroutine Operation it will take evaluate the first </span>
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00043 <span class="comment"> (and possible second) child branch and use them as input variables for</span>
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00044 <span class="comment"> the remaining second (or third) child branch.</span>
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00045 <span class="comment">*/</span>
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00046
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00047
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00048 <span class="keyword">typedef</span> <span class="keyword">enum</span> {Variable, UFunction, BFunction, BOperator, Const} Type;
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00049
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00050 <span class="keyword">typedef</span> double (*BinaryFunction)(<span class="keyword">const</span> double,<span class="keyword">const</span> double);
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00051 <span class="keyword">typedef</span> double (*UnaryFunction)(<span class="keyword">const</span> double);
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00052
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00053 <span class="keyword">struct </span>Operation
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00054 {
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00055 <span class="keyword">public</span>:
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00056
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00057 <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> VariableID;
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00058 <span class="keyword">typedef</span> string Label;
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00059
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00060
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00061 <span class="comment">// if your compiler allows you to have nameless unions you can make this a</span>
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00062 <span class="comment">// union by removing the //'s below</span>
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00063
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00064 <span class="comment">//union</span>
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00065 <span class="comment">//{</span>
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00066 UnaryFunction uFunction;
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00067 BinaryFunction bFunction;
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00068 VariableID id;
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00069 <span class="keywordtype">double</span> constant;
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00070 <span class="comment">//};</span>
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00071
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00072
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00073
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00074 Label label;
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00075 Type type;
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00076
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00077 <span class="comment">// the default constructor results in a constant with value 0</span>
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00078 Operation() : constant(0), label(<span class="stringliteral">"0"</span>), type(Const){};
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00079 <span class="comment">// two possible constructors for Unary Functions</span>
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00080 Operation(UnaryFunction _uf, Label _label): uFunction(_uf), label(_label), type(UFunction) {};
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00081 Operation(Label _label, UnaryFunction _uf): uFunction(_uf), label(_label), type(UFunction) {};
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00082
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00083 <span class="comment">// Watch out there are two constructors using pointers two binary functions:</span>
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00084 <span class="comment">// Binary Function (printed as label(subtree0,subtree1) (e.g. pow(x,y))</span>
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00085 <span class="comment">// Binary Operator (printed as (subtree0 label subtree1) (e.g. x^y)</span>
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00086 <span class="comment">// The difference is purely cosmetic.</span>
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00087
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00088 <span class="comment">// If you specify the label before the function pointer -> Binary Function</span>
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00089 Operation(Label _label, BinaryFunction _bf): bFunction(_bf), label(_label), type(BFunction) {};
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00090 <span class="comment">// If you specify the function pointer before the label -> Binary Operator</span>
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00091 Operation(BinaryFunction _bf, Label _label): bFunction(_bf), label(_label), type(BOperator) {};
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00092
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00093 <span class="comment">// A constructor for variables</span>
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00094 Operation(VariableID _id, Label _label): id(_id), label(_label), type(Variable) {};
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00095 <span class="comment">// A constructor for constants</span>
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00096 Operation(<span class="keywordtype">double</span> _constant, Label _label): constant(_constant), label(_label), type(Const) {};
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00097
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00098
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00099 Operation(<span class="keyword">const</span> Operation &_op)
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00100 {
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00101 <span class="keywordflow">switch</span>(_op.type)
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00102 {
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00103 <span class="keywordflow">case</span> Variable: <span class="keywordtype">id</span> = _op.id; <span class="keywordflow">break</span>;
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00104 <span class="keywordflow">case</span> UFunction: uFunction = _op.uFunction; <span class="keywordflow">break</span>;
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00105 <span class="keywordflow">case</span> BFunction: bFunction = _op.bFunction; <span class="keywordflow">break</span>;
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00106 <span class="keywordflow">case</span> BOperator: bFunction = _op.bFunction; <span class="keywordflow">break</span>;
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00107 <span class="keywordflow">case</span> Const: constant = _op.constant; <span class="keywordflow">break</span>;
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00108 }
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00109 type = _op.type;
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00110 label = _op.label;
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00111 };
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00112 <span class="keyword">virtual</span> ~Operation(){};
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00113
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00114 };
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00115
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00116
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00117 <span class="keyword">class </span>Node
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00118 {
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00119 <span class="keyword">private</span>:
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00120 Operation op;
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00121
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00122 <span class="keyword">public</span>:
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00123
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00124 Node(<span class="keywordtype">void</span>): op(Operation()){};
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00125 Node(Operation &_op) : op(_op){};
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00126 <span class="keyword">virtual</span> ~Node(<span class="keywordtype">void</span>) {}
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00127
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00128 <span class="keywordtype">int</span> arity(<span class="keywordtype">void</span>)<span class="keyword"> const </span>
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00129 <span class="keyword"> </span>{
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00130 <span class="keywordflow">switch</span>(op.type)
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00131 {
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00132 <span class="keywordflow">case</span> Variable: <span class="keywordflow">return</span> 0;
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00133 <span class="keywordflow">case</span> UFunction: <span class="keywordflow">return</span> 1;
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00134 <span class="keywordflow">case</span> BFunction: <span class="keywordflow">return</span> 2;
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00135 <span class="keywordflow">case</span> BOperator: <span class="keywordflow">return</span> 2;
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00136 <span class="keywordflow">case</span> Const: <span class="keywordflow">return</span> 0;
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00137 }
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00138 <span class="keywordflow">return</span> 0;
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00139 }
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00140
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00141 <span class="keywordtype">void</span> randomize(<span class="keywordtype">void</span>) {}
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00142
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00143 <span class="keyword">template</span><<span class="keyword">class</span> Children>
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00144 <span class="keywordtype">void</span> operator()(<span class="keywordtype">double</span>& result, Children args, vector<double> &var)<span class="keyword"> const</span>
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00145 <span class="keyword"> </span>{
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00146 <span class="keywordtype">double</span> result0;
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00147 <span class="keywordtype">double</span> result1;
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00148
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00149
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00150 <span class="keywordflow">switch</span>(op.type)
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00151 {
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00152 <span class="keywordflow">case</span> Variable: result = var[op.id%var.size()]; <span class="comment">//%var.size() used in the case of Subroutines and as a security measure</span>
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00153 <span class="keywordflow">break</span>;
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00154 <span class="keywordflow">case</span> UFunction: args[0].apply(result0, var);
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00155 result = op.uFunction(result0);
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00156 <span class="keywordflow">break</span>;
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00157 <span class="keywordflow">case</span> BFunction:
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00158 <span class="keywordflow">case</span> BOperator: args[0].apply(result0, var);
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00159 args[1].apply(result1, var);
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00160 result = op.bFunction(result0,result1);
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00161 <span class="keywordflow">break</span>;
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00162 <span class="keywordflow">case</span> Const: result = op.constant;
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00163 <span class="keywordflow">break</span>;
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00164
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00165 }
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00166
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00167 }
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00168
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00169 <span class="keyword">template</span><<span class="keyword">class</span> Children>
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00170 <span class="keywordtype">void</span> operator()(string& result, Children args)<span class="keyword"> const</span>
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00171 <span class="keyword"> </span>{
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00172
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00173 string subtree0;
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00174 string subtree1;
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00175 string subtree2;
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00176
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00177 <span class="keywordflow">switch</span>(op.type)
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00178 {
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00179
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00180 <span class="keywordflow">case</span> Variable:
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00181 <span class="keywordflow">case</span> Const: result += op.label;
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00182 <span class="keywordflow">break</span>;
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00183
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00184 <span class="keywordflow">case</span> UFunction: result += op.label;
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00185 result += <span class="stringliteral">"("</span>;
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00186 args[0].apply(subtree0);
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00187 result += subtree0;
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00188 result += <span class="stringliteral">")"</span>;
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00189 <span class="keywordflow">break</span>;
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00190 <span class="keywordflow">case</span> BFunction: result += op.label;
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00191 result += <span class="stringliteral">"("</span>;
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00192 args[0].apply(subtree0);
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00193 result += subtree0;
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00194 result += <span class="stringliteral">","</span>;
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00195 args[1].apply(subtree1);
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00196 result += subtree1;
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00197 result += <span class="stringliteral">")"</span>;
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00198 <span class="keywordflow">break</span>;
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00199 <span class="keywordflow">case</span> BOperator: result += <span class="stringliteral">"("</span>;
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00200 args[0].apply(subtree0);
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00201 result += subtree0;
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00202 result += op.label;
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00203 args[1].apply(subtree1);
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00204 result += subtree1;
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00205 result += <span class="stringliteral">")"</span>;
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00206 <span class="keywordflow">break</span>;
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00207 <span class="keywordflow">default</span>: result += <span class="stringliteral">"ERROR in Node::operator(string,...) \n"</span>; <span class="keywordflow">break</span>;
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00208 }
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00209 }
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00210
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00211 Operation getOp(<span class="keywordtype">void</span>)<span class="keyword"> const </span>{<span class="keywordflow">return</span> op;}
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00212
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00213 };
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00214
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00215
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00216
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00217
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00218
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00219
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00220
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00221
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00222
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00223
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00224
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00225 <span class="comment">//-----------------------------------------------------------</span>
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00226 <span class="comment">// saving, loading LETS LEAVE IT OUT FOR NOW</span>
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00227
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00228
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00229
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00230 std::ostream& operator<<(std::ostream& os, <span class="keyword">const</span> Node& eot)
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00231 {
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00232 Operation op(eot.getOp());
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00233
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00234 os << (eot.getOp()).label;
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00235 <span class="keywordflow">return</span> os;
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00236 }
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00237
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00238
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00239 <span class="comment">// we can't load because we are using function pointers. Instead we prevent a compiler warning by calling the arity() function.</span>
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00240 std::istream& operator>>(std::istream& is, Node& eot)
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00241 {
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00242 eot.arity();
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00243 <span class="keywordflow">return</span> is;
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00244 }
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00245
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00246
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00247
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00248 <span class="preprocessor">#endif</span>
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</pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Oct 19 05:06:41 2006 for EO by
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<a href="http://www.doxygen.org/index.html">
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.3.9.1 </small></address>
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