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<div id="projectname">CVC3 <span id="projectnumber">2.4.1</span></div>
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<div class="title">minisat_varorder.h</div> </div>
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<a href="minisat__varorder_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*****************************************************************************/</span><span class="comment"></span>
<a name="l00002"></a>00002 <span class="comment">/*!</span>
<a name="l00003"></a>00003 <span class="comment"> *\file minisat_varorder.h</span>
<a name="l00004"></a>00004 <span class="comment"> *\brief MiniSat decision heuristics</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> * Author: Alexander Fuchs</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> * Created: Fri Sep 08 11:04:00 2006</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * <hr></span>
<a name="l00011"></a>00011 <span class="comment"> *</span>
<a name="l00012"></a>00012 <span class="comment"> * License to use, copy, modify, sell and/or distribute this software</span>
<a name="l00013"></a>00013 <span class="comment"> * and its documentation for any purpose is hereby granted without</span>
<a name="l00014"></a>00014 <span class="comment"> * royalty, subject to the terms and conditions defined in the \ref</span>
<a name="l00015"></a>00015 <span class="comment"> * LICENSE file provided with this distribution.</span>
<a name="l00016"></a>00016 <span class="comment"> * </span>
<a name="l00017"></a>00017 <span class="comment"> * <hr></span>
<a name="l00018"></a>00018 <span class="comment"> */</span>
<a name="l00019"></a>00019 <span class="comment">/*****************************************************************************/</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="comment">/**************************************************************************************[VarOrder.h]</span>
<a name="l00022"></a>00022 <span class="comment">MiniSat -- Copyright (c) 2003-2005, Niklas Een, Niklas Sorensson</span>
<a name="l00023"></a>00023 <span class="comment"></span>
<a name="l00024"></a>00024 <span class="comment">Permission is hereby granted, free of charge, to any person obtaining a copy of this software and</span>
<a name="l00025"></a>00025 <span class="comment">associated documentation files (the "Software"), to deal in the Software without restriction,</span>
<a name="l00026"></a>00026 <span class="comment">including without limitation the rights to use, copy, modify, merge, publish, distribute,</span>
<a name="l00027"></a>00027 <span class="comment">sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is</span>
<a name="l00028"></a>00028 <span class="comment">furnished to do so, subject to the following conditions:</span>
<a name="l00029"></a>00029 <span class="comment"></span>
<a name="l00030"></a>00030 <span class="comment">The above copyright notice and this permission notice shall be included in all copies or</span>
<a name="l00031"></a>00031 <span class="comment">substantial portions of the Software.</span>
<a name="l00032"></a>00032 <span class="comment"></span>
<a name="l00033"></a>00033 <span class="comment">THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT</span>
<a name="l00034"></a>00034 <span class="comment">NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span>
<a name="l00035"></a>00035 <span class="comment">NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,</span>
<a name="l00036"></a>00036 <span class="comment">DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT</span>
<a name="l00037"></a>00037 <span class="comment">OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>
<a name="l00038"></a>00038 <span class="comment">**************************************************************************************************/</span>
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="preprocessor">#ifndef _cvc3__minisat__varorder_h_</span>
<a name="l00041"></a>00041 <span class="preprocessor"></span><span class="preprocessor">#define _cvc3__minisat__varorder_h_</span>
<a name="l00042"></a>00042 <span class="preprocessor"></span>
<a name="l00043"></a>00043 <span class="comment">//=================================================================================================</span>
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="preprocessor">#include "<a class="code" href="minisat__types_8h.html" title="MiniSat internal types.">minisat_types.h</a>"</span>
<a name="l00046"></a>00046 <span class="preprocessor">#include "<a class="code" href="minisat__heap_8h.html" title="MiniSat internal heap implementation.">minisat_heap.h</a>"</span>
<a name="l00047"></a>00047 <span class="preprocessor">#include <iostream></span>
<a name="l00048"></a>00048 <span class="preprocessor">#include <vector></span>
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="comment">// implements the decision heuristics by using a heap over variable ids (which are ints)</span>
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="keyword">namespace </span>MiniSat {
<a name="l00053"></a>00053
<a name="l00054"></a><a class="code" href="structMiniSat_1_1VarOrder__lt.html">00054</a> <span class="keyword">struct </span><a class="code" href="structMiniSat_1_1VarOrder__lt.html">VarOrder_lt</a> {
<a name="l00055"></a><a class="code" href="structMiniSat_1_1VarOrder__lt.html#a923af1d9d5de1707c9e7fa22c5251144">00055</a> <span class="keyword">const</span> std::vector<double>& <a class="code" href="structMiniSat_1_1VarOrder__lt.html#a923af1d9d5de1707c9e7fa22c5251144">activity</a>;
<a name="l00056"></a><a class="code" href="structMiniSat_1_1VarOrder__lt.html#aa7550b38b4b09a980e6ad9e39e838333">00056</a> <span class="keywordtype">bool</span> <a class="code" href="structMiniSat_1_1VarOrder__lt.html#aa7550b38b4b09a980e6ad9e39e838333">operator () </a>(<a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> x, <a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> y) { <span class="keywordflow">return</span> <a class="code" href="structMiniSat_1_1VarOrder__lt.html#a923af1d9d5de1707c9e7fa22c5251144">activity</a>[x] > <a class="code" href="structMiniSat_1_1VarOrder__lt.html#a923af1d9d5de1707c9e7fa22c5251144">activity</a>[y]; }
<a name="l00057"></a><a class="code" href="structMiniSat_1_1VarOrder__lt.html#a93e4347a40a0a094ac815624c1094d27">00057</a> <a class="code" href="structMiniSat_1_1VarOrder__lt.html#a93e4347a40a0a094ac815624c1094d27">VarOrder_lt</a>(<span class="keyword">const</span> std::vector<double>& act) : <a class="code" href="structMiniSat_1_1VarOrder__lt.html#a923af1d9d5de1707c9e7fa22c5251144">activity</a>(act) { }
<a name="l00058"></a>00058 };
<a name="l00059"></a>00059
<a name="l00060"></a><a class="code" href="classMiniSat_1_1VarOrder.html">00060</a> <span class="keyword">class </span><a class="code" href="classMiniSat_1_1VarOrder.html">VarOrder</a> {
<a name="l00061"></a><a class="code" href="classMiniSat_1_1VarOrder.html#ae40766b30ce26ce909197d11346ea5b5">00061</a> <span class="keyword">const</span> std::vector<signed char>& <a class="code" href="classMiniSat_1_1VarOrder.html#ae40766b30ce26ce909197d11346ea5b5">assigns</a>; <span class="comment">// var->val. Pointer to external assignment table.</span>
<a name="l00062"></a><a class="code" href="classMiniSat_1_1VarOrder.html#af401cbd73bcf89a44ee694a483c4353f">00062</a> <span class="keyword">const</span> std::vector<double>& <a class="code" href="classMiniSat_1_1VarOrder.html#af401cbd73bcf89a44ee694a483c4353f">activity</a>; <span class="comment">// var->act. Pointer to external activity table.</span>
<a name="l00063"></a><a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">00063</a> <a class="code" href="classMiniSat_1_1Heap.html">Heap<VarOrder_lt></a> <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>;
<a name="l00064"></a><a class="code" href="classMiniSat_1_1VarOrder.html#a1e7499a094d1acff4fae337bd4e933d2">00064</a> <span class="keywordtype">double</span> <a class="code" href="classMiniSat_1_1VarOrder.html#a1e7499a094d1acff4fae337bd4e933d2">random_seed</a>; <span class="comment">// For the internal random number generator</span>
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="keyword">public</span>:
<a name="l00067"></a><a class="code" href="classMiniSat_1_1VarOrder.html#a1c3e0f59f6ab6c69f4e64a85fb7aa250">00067</a> <a class="code" href="classMiniSat_1_1VarOrder.html#a1c3e0f59f6ab6c69f4e64a85fb7aa250">VarOrder</a>(<span class="keyword">const</span> std::vector<signed char>& ass, <span class="keyword">const</span> std::vector<double>& act) :
<a name="l00068"></a>00068 <a class="code" href="classMiniSat_1_1VarOrder.html#ae40766b30ce26ce909197d11346ea5b5">assigns</a>(ass), <a class="code" href="classMiniSat_1_1VarOrder.html#af401cbd73bcf89a44ee694a483c4353f">activity</a>(act), <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>(<a class="code" href="structMiniSat_1_1VarOrder__lt.html">VarOrder_lt</a>(act)), <a class="code" href="classMiniSat_1_1VarOrder.html#a1e7499a094d1acff4fae337bd4e933d2">random_seed</a>(91648253)
<a name="l00069"></a>00069 { }
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1VarOrder.html#abbbb3b10b818db613dc1c9b9d18883d5">newVar</a>(<span class="keywordtype">void</span>);
<a name="l00072"></a>00072 <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1VarOrder.html#abbbb3b10b818db613dc1c9b9d18883d5">newVar</a>(<span class="keywordtype">int</span> varIndex);
<a name="l00073"></a>00073 <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1VarOrder.html#a75869a564989c014a16d43f4422f0316">update</a>(<a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> x); <span class="comment">// Called when variable increased in activity.</span>
<a name="l00074"></a>00074 <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1VarOrder.html#a9a5913c635dc1c57cd1127a8af30eefb">undo</a>(<a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> x); <span class="comment">// Called when variable is unassigned and may be selected again.</span>
<a name="l00075"></a>00075 <span class="keyword">inline</span> <a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> <a class="code" href="classMiniSat_1_1VarOrder.html#a108a646f3c1191a41f095d3ad9652e27">select</a>(<span class="keywordtype">double</span> random_freq =.0); <span class="comment">// Selects a new, unassigned variable (or 'var_Undef' if none exists).</span>
<a name="l00076"></a>00076 };
<a name="l00077"></a>00077
<a name="l00078"></a>00078
<a name="l00079"></a><a class="code" href="classMiniSat_1_1VarOrder.html#abbbb3b10b818db613dc1c9b9d18883d5">00079</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1VarOrder.html#abbbb3b10b818db613dc1c9b9d18883d5">VarOrder::newVar</a>(<span class="keywordtype">void</span>)
<a name="l00080"></a>00080 {
<a name="l00081"></a>00081 <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#a34effd6f134ab69b4b85457db75687c6">setBounds</a>(<a class="code" href="classMiniSat_1_1VarOrder.html#ae40766b30ce26ce909197d11346ea5b5">assigns</a>.size());
<a name="l00082"></a>00082 <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#ac7894aec7f2b7df8a7d8acc5c7b54cf0">insert</a>(<a class="code" href="classMiniSat_1_1VarOrder.html#ae40766b30ce26ce909197d11346ea5b5">assigns</a>.size()-1);
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084
<a name="l00085"></a><a class="code" href="classMiniSat_1_1VarOrder.html#afd8bfbc19931b8b8b03c875b05700f3d">00085</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1VarOrder.html#abbbb3b10b818db613dc1c9b9d18883d5">VarOrder::newVar</a>(<span class="keywordtype">int</span> varIndex)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087 <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#a34effd6f134ab69b4b85457db75687c6">setBounds</a>(<a class="code" href="classMiniSat_1_1VarOrder.html#ae40766b30ce26ce909197d11346ea5b5">assigns</a>.size());
<a name="l00088"></a>00088 <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#ac7894aec7f2b7df8a7d8acc5c7b54cf0">insert</a>(varIndex);
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090
<a name="l00091"></a><a class="code" href="classMiniSat_1_1VarOrder.html#a75869a564989c014a16d43f4422f0316">00091</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1VarOrder.html#a75869a564989c014a16d43f4422f0316">VarOrder::update</a>(<a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> x)
<a name="l00092"></a>00092 {
<a name="l00093"></a>00093 <span class="keywordflow">if</span> (<a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#a0077d89ebfc0fffac5570ed4fd31db0a">inHeap</a>(x))
<a name="l00094"></a>00094 <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#a310d2aa77c8eb04cb2043edaa7ec65cd">increase</a>(x);
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096
<a name="l00097"></a><a class="code" href="classMiniSat_1_1VarOrder.html#a9a5913c635dc1c57cd1127a8af30eefb">00097</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1VarOrder.html#a9a5913c635dc1c57cd1127a8af30eefb">VarOrder::undo</a>(<a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> x)
<a name="l00098"></a>00098 {
<a name="l00099"></a>00099 <span class="keywordflow">if</span> (!<a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#a0077d89ebfc0fffac5570ed4fd31db0a">inHeap</a>(x))
<a name="l00100"></a>00100 <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#ac7894aec7f2b7df8a7d8acc5c7b54cf0">insert</a>(x);
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102
<a name="l00103"></a>00103
<a name="l00104"></a><a class="code" href="classMiniSat_1_1VarOrder.html#a108a646f3c1191a41f095d3ad9652e27">00104</a> <a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> <a class="code" href="classMiniSat_1_1VarOrder.html#a108a646f3c1191a41f095d3ad9652e27">VarOrder::select</a>(<span class="keywordtype">double</span> random_var_freq)
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106 <span class="comment">// Random decision:</span>
<a name="l00107"></a>00107 <span class="comment">/*</span>
<a name="l00108"></a>00108 <span class="comment"> if (drand(random_seed) < random_var_freq && !heap.empty()){</span>
<a name="l00109"></a>00109 <span class="comment"> Var next = irand(random_seed,assigns.size());</span>
<a name="l00110"></a>00110 <span class="comment"> </span>
<a name="l00111"></a>00111 <span class="comment"> // find var which is not undefined or in the heap</span>
<a name="l00112"></a>00112 <span class="comment"> while (toLbool(assigns[next]) == l_Undef && !heap.inHeap(next)) {</span>
<a name="l00113"></a>00113 <span class="comment"> next = irand(random_seed,assigns.size());</span>
<a name="l00114"></a>00114 <span class="comment"> }</span>
<a name="l00115"></a>00115 <span class="comment"> if (toLbool(assigns[next]) == l_Undef) {</span>
<a name="l00116"></a>00116 <span class="comment"> return next;</span>
<a name="l00117"></a>00117 <span class="comment"> }</span>
<a name="l00118"></a>00118 <span class="comment"></span>
<a name="l00119"></a>00119 <span class="comment"> // cvc does not necessarily use all variable ids without gaps,</span>
<a name="l00120"></a>00120 <span class="comment"> // so need to check if the picked id is a valid variable.</span>
<a name="l00121"></a>00121 <span class="comment"> //if (toLbool(assigns[next]) == l_Undef && heap.inHeap(next)) {</span>
<a name="l00122"></a>00122 <span class="comment"> // return next;</span>
<a name="l00123"></a>00123 <span class="comment"> //}</span>
<a name="l00124"></a>00124 <span class="comment"> }</span>
<a name="l00125"></a>00125 <span class="comment"> */</span>
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="comment">// Activity based decision:</span>
<a name="l00128"></a>00128 <span class="keywordflow">while</span> (!<a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#a5ad9e09e6507ca710de3cee7ae973917">empty</a>()){
<a name="l00129"></a>00129 <a class="code" href="namespaceMiniSat.html#a0d9722420b2afd308dceda22c1b05a5e">Var</a> next = <a class="code" href="classMiniSat_1_1VarOrder.html#a0166d6074f1bdf22f2e7dfadb57d03e6">heap</a>.<a class="code" href="classMiniSat_1_1Heap.html#abe25b0482ce0c0822968e7149bb1f12d">getMin</a>();
<a name="l00130"></a>00130 <span class="keywordflow">if</span> (<a class="code" href="namespaceMiniSat.html#a1c28cb1733880d6dbc7aff894cb5527d">toLbool</a>(<a class="code" href="classMiniSat_1_1VarOrder.html#ae40766b30ce26ce909197d11346ea5b5">assigns</a>[next]) == <a class="code" href="namespaceMiniSat.html#aa6f5310857da28f01311aebd650a531f">l_Undef</a>)
<a name="l00131"></a>00131 <span class="keywordflow">return</span> next;
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="keywordflow">return</span> <a class="code" href="namespaceMiniSat.html#af0b81724f9c7f24ed9a52a4627b5db86">var_Undef</a>;
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="comment">//=================================================================================================</span>
<a name="l00140"></a>00140 <span class="preprocessor">#endif</span>
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