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<div class="title">minisat_derivation.h</div> </div>
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<a href="minisat__derivation_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_derivation.h</span>
<a name="l00004"></a>00004 <span class="comment"> *\brief MiniSat proof logging</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: Sun Dec 07 11:09:00 2007</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="preprocessor">#ifndef _cvc3__sat__minisat_derivation_h_</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor">#define _cvc3__sat__minisat_derivation_h_</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="minisat__types_8h.html" title="MiniSat internal types.">minisat_types.h</a>"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <<a class="code" href="hash__map_8h.html" title="hash map implementation">hash_map.h</a>></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <<a class="code" href="hash__set_8h.html" title="hash map implementation">hash_set.h</a>></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <set></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <vector></span>
<a name="l00030"></a>00030 <span class="preprocessor">#include <deque></span>
<a name="l00031"></a>00031 <span class="preprocessor">#include <algorithm></span>
<a name="l00032"></a>00032 <span class="preprocessor">#include <string></span>
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="keyword">namespace </span>SAT {
<a name="l00035"></a>00035 <span class="keyword">class </span>SatProof;
<a name="l00036"></a>00036 }
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">namespace </span>MiniSat {
<a name="l00039"></a>00039 <span class="comment">// a resolution inference as a sequence of binary resolution steps</span>
<a name="l00040"></a><a class="code" href="classMiniSat_1_1Inference.html">00040</a> <span class="keyword">class </span><a class="code" href="classMiniSat_1_1Inference.html">Inference</a> {
<a name="l00041"></a>00041 <span class="keyword">public</span>:
<a name="l00042"></a><a class="code" href="classMiniSat_1_1Inference.html#a0eef845f209a9bc406fe887c34f82553">00042</a> <span class="keyword">typedef</span> std::vector<std::pair<Lit, int> > <a class="code" href="classMiniSat_1_1Inference.html#a0eef845f209a9bc406fe887c34f82553">TSteps</a>;
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="keyword">private</span>:
<a name="l00045"></a>00045 <span class="comment">// id of first clause</span>
<a name="l00046"></a><a class="code" href="classMiniSat_1_1Inference.html#accb661eccfd99a099e87826cd4de1401">00046</a> <span class="keywordtype">int</span> <a class="code" href="classMiniSat_1_1Inference.html#accb661eccfd99a099e87826cd4de1401">d_start</a>;
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="comment">// binary resolution step:</span>
<a name="l00049"></a>00049 <span class="comment">// result of previous step (or d_start)</span>
<a name="l00050"></a>00050 <span class="comment">// on literal with next clause (given by id)</span>
<a name="l00051"></a><a class="code" href="classMiniSat_1_1Inference.html#abc3a42c6b8b055f9b5b021590a3f1a00">00051</a> <a class="code" href="classMiniSat_1_1Inference.html#a0eef845f209a9bc406fe887c34f82553">TSteps</a> <a class="code" href="classMiniSat_1_1Inference.html#abc3a42c6b8b055f9b5b021590a3f1a00">d_steps</a>;
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="keyword">public</span>:
<a name="l00054"></a><a class="code" href="classMiniSat_1_1Inference.html#aacd20460934eca56417f7add43e9150c">00054</a> <a class="code" href="classMiniSat_1_1Inference.html#aacd20460934eca56417f7add43e9150c">Inference</a>(<span class="keywordtype">int</span> clauseID) : <a class="code" href="classMiniSat_1_1Inference.html#accb661eccfd99a099e87826cd4de1401">d_start</a>(clauseID) {
<a name="l00055"></a>00055 <span class="comment">// std::cout << "Start inference: " << clauseID << std::endl;</span>
<a name="l00056"></a>00056 };
<a name="l00057"></a>00057
<a name="l00058"></a><a class="code" href="classMiniSat_1_1Inference.html#a61184032373fe3049198f8e3a71e436f">00058</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Inference.html#a61184032373fe3049198f8e3a71e436f">add</a>(<a class="code" href="classMiniSat_1_1Lit.html">Lit</a> lit, <span class="keywordtype">int</span> clauseID) {
<a name="l00059"></a>00059 <a class="code" href="classMiniSat_1_1Inference.html#abc3a42c6b8b055f9b5b021590a3f1a00">d_steps</a>.push_back(std::make_pair(lit, clauseID));
<a name="l00060"></a>00060 };
<a name="l00061"></a>00061
<a name="l00062"></a><a class="code" href="classMiniSat_1_1Inference.html#aa1ae6b861dd2a7dc80348d96e204bd8b">00062</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Inference.html#aa1ae6b861dd2a7dc80348d96e204bd8b">add</a>(<a class="code" href="classMiniSat_1_1Lit.html">Lit</a> lit, <a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause) {
<a name="l00063"></a>00063 <a class="code" href="classMiniSat_1_1Inference.html#a61184032373fe3049198f8e3a71e436f">add</a>(lit, clause-><a class="code" href="classMiniSat_1_1Clause.html#aeb8881da1f982f5bc58bac190ab2f2a4">id</a>());
<a name="l00064"></a>00064 };
<a name="l00065"></a>00065
<a name="l00066"></a><a class="code" href="classMiniSat_1_1Inference.html#a932d4071d9f794757ad9db27cb3fd1a3">00066</a> <span class="keywordtype">int</span> <a class="code" href="classMiniSat_1_1Inference.html#a932d4071d9f794757ad9db27cb3fd1a3">getStart</a>()<span class="keyword"> const </span>{
<a name="l00067"></a>00067 <span class="keywordflow">return</span> <a class="code" href="classMiniSat_1_1Inference.html#accb661eccfd99a099e87826cd4de1401">d_start</a>;
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069
<a name="l00070"></a><a class="code" href="classMiniSat_1_1Inference.html#a4111b13d1401b38cbe749357793883fa">00070</a> <span class="keyword">const</span> <a class="code" href="classMiniSat_1_1Inference.html#a0eef845f209a9bc406fe887c34f82553">TSteps</a>& <a class="code" href="classMiniSat_1_1Inference.html#a4111b13d1401b38cbe749357793883fa">getSteps</a>()<span class="keyword"> const </span>{
<a name="l00071"></a>00071 <span class="keywordflow">return</span> <a class="code" href="classMiniSat_1_1Inference.html#abc3a42c6b8b055f9b5b021590a3f1a00">d_steps</a>;
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="comment">// returns steps as a lits: clauseId0 literal0.toString clauseID1 ...</span>
<a name="l00075"></a>00075 std::string <a class="code" href="classMiniSat_1_1Inference.html#aacd9c375bc7b8b0d87a15bcd9b5d35ce">toString</a>() <span class="keyword">const</span>;
<a name="l00076"></a>00076 };
<a name="l00077"></a>00077
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keyword">class </span>Solver;
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="comment">// Heavily based on the proof logging version of MiniSat (1.14p)</span>
<a name="l00082"></a>00082 <span class="comment">//</span>
<a name="l00083"></a>00083 <span class="comment">// Note: this implementation keeps the whole derivation in memory -</span>
<a name="l00084"></a>00084 <span class="comment">// for many problems this is not feasible.</span>
<a name="l00085"></a>00085 <span class="comment">// should provide an alternative implementation that logs the derivation</span>
<a name="l00086"></a>00086 <span class="comment">// to a file and constructs the proof from it.</span>
<a name="l00087"></a><a class="code" href="classMiniSat_1_1Derivation.html">00087</a> <span class="keyword">class </span><a class="code" href="classMiniSat_1_1Derivation.html">Derivation</a> {
<a name="l00088"></a>00088 <span class="keyword">public</span>:
<a name="l00089"></a><a class="code" href="classMiniSat_1_1Derivation.html#ae65f535354bdc282a534bbc545020939">00089</a> <span class="keyword">typedef</span> <a class="code" href="classHash_1_1hash__map.html">Hash::hash_map<int, Clause*></a> <a class="code" href="classMiniSat_1_1Derivation.html#ae65f535354bdc282a534bbc545020939">TClauses</a>;
<a name="l00090"></a><a class="code" href="classMiniSat_1_1Derivation.html#aeb7fb6543cb0d529aaa2bfc841e0aa47">00090</a> <span class="keyword">typedef</span> <a class="code" href="classHash_1_1hash__set.html">Hash::hash_set<int></a> <a class="code" href="classMiniSat_1_1Derivation.html#aeb7fb6543cb0d529aaa2bfc841e0aa47">TInputClauses</a>;
<a name="l00091"></a><a class="code" href="classMiniSat_1_1Derivation.html#a4f8e0c51560466d4a511c048dc6f046d">00091</a> <span class="keyword">typedef</span> <a class="code" href="classHash_1_1hash__map.html">Hash::hash_map<int, Inference*></a> <a class="code" href="classMiniSat_1_1Derivation.html#a4f8e0c51560466d4a511c048dc6f046d">TInferences</a>;
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keyword">private</span>:
<a name="l00094"></a>00094 <span class="comment">// mapping from id to clause</span>
<a name="l00095"></a><a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">00095</a> <a class="code" href="classHash_1_1hash__map.html">TClauses</a> <a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">d_clauses</a>;
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="comment">// as an additional check, explicitely mark which clauses are input clauses</span>
<a name="l00098"></a>00098 <span class="comment">// by adding their id to this set.</span>
<a name="l00099"></a>00099 <span class="comment">//</span>
<a name="l00100"></a>00100 <span class="comment">// as an invariant an id should be either in d_inferences or d_inputClauses,</span>
<a name="l00101"></a>00101 <span class="comment">// as a clause does exactly have no inference attached if it is an input clause.</span>
<a name="l00102"></a><a class="code" href="classMiniSat_1_1Derivation.html#abb29d2dd68d48989190d3356da2d0ae4">00102</a> <a class="code" href="classHash_1_1hash__set.html">TInputClauses</a> <a class="code" href="classMiniSat_1_1Derivation.html#abb29d2dd68d48989190d3356da2d0ae4">d_inputClauses</a>;
<a name="l00103"></a>00103
<a name="l00104"></a>00104 <span class="comment">// unit clauses derived with computeRootReason</span>
<a name="l00105"></a>00105 <span class="comment">// mapping from index of literal to clause</span>
<a name="l00106"></a><a class="code" href="classMiniSat_1_1Derivation.html#ae1fc34cb0a0c68bd82d2d1c80892f466">00106</a> <a class="code" href="classHash_1_1hash__map.html">TClauses</a> <a class="code" href="classMiniSat_1_1Derivation.html#ae1fc34cb0a0c68bd82d2d1c80892f466">d_unitClauses</a>;
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="comment">// mapping from clause id to the inference it was derived by</span>
<a name="l00109"></a><a class="code" href="classMiniSat_1_1Derivation.html#a5dc6e9795fc769f2c2665b3667dbdc7d">00109</a> <a class="code" href="classHash_1_1hash__map.html">TInferences</a> <a class="code" href="classMiniSat_1_1Derivation.html#a5dc6e9795fc769f2c2665b3667dbdc7d">d_inferences</a>;
<a name="l00110"></a>00110
<a name="l00111"></a>00111 <span class="comment">// clauses removed from the solver</span>
<a name="l00112"></a><a class="code" href="classMiniSat_1_1Derivation.html#a643c4cd61616c700b5e97c82aa55e062">00112</a> std::deque<Clause*> <a class="code" href="classMiniSat_1_1Derivation.html#a643c4cd61616c700b5e97c82aa55e062">d_removedClauses</a>;
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="comment">// empty clause of derivation, if derived</span>
<a name="l00115"></a><a class="code" href="classMiniSat_1_1Derivation.html#a7f00bbd5b002f55eea71e62b06209021">00115</a> <a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* <a class="code" href="classMiniSat_1_1Derivation.html#a7f00bbd5b002f55eea71e62b06209021">d_emptyClause</a>;
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="keyword">public</span>:
<a name="l00118"></a><a class="code" href="classMiniSat_1_1Derivation.html#af89db5799084d51dcb97bd24847d9633">00118</a> <a class="code" href="classMiniSat_1_1Derivation.html#af89db5799084d51dcb97bd24847d9633">Derivation</a>() : <a class="code" href="classMiniSat_1_1Derivation.html#a7f00bbd5b002f55eea71e62b06209021">d_emptyClause</a>(NULL) {};
<a name="l00119"></a>00119 <a class="code" href="classMiniSat_1_1Derivation.html#a72d5632fb889b903e8f88891943e5562">~Derivation</a>();
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="comment">// note: allow for duplicate insertion of clauses registerClause and registerInputClause,</span>
<a name="l00122"></a>00122 <span class="comment">// as this can happen in the current implementation</span>
<a name="l00123"></a>00123 <span class="comment">// for theory clauses which are inconsistent on insertion.</span>
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">// register a new clause</span>
<a name="l00126"></a><a class="code" href="classMiniSat_1_1Derivation.html#a86b49978f3ea0aa72cd4815e241ff7ad">00126</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a86b49978f3ea0aa72cd4815e241ff7ad">registerClause</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause) {
<a name="l00127"></a>00127 <span class="comment">// std::cout << "register clause : " << clause->id() << " : " << clause->toString() << std::endl;</span>
<a name="l00128"></a>00128
<a name="l00129"></a>00129 <span class="comment">//IF_DEBUG (</span>
<a name="l00130"></a>00130 <span class="keywordflow">if</span> (<a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">d_clauses</a>.<a class="code" href="classHash_1_1hash__map.html#a48feee7c5690c9cd9ba1b0817ca3ae9f" title="status">contains</a>(clause-><a class="code" href="classMiniSat_1_1Clause.html#aeb8881da1f982f5bc58bac190ab2f2a4">id</a>())) {
<a name="l00131"></a>00131 <span class="comment">// if clause with id does already exist,</span>
<a name="l00132"></a>00132 <span class="comment">// then it must be a simplification of the original clause</span>
<a name="l00133"></a>00133 <a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* old = <a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">d_clauses</a>[clause-><a class="code" href="classMiniSat_1_1Clause.html#aeb8881da1f982f5bc58bac190ab2f2a4">id</a>()];
<a name="l00134"></a>00134 <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(old-><a class="code" href="classMiniSat_1_1Clause.html#adf5aa50a639b4b5bb71e5ea76d45b8e2">size</a>() == clause-><a class="code" href="classMiniSat_1_1Clause.html#adf5aa50a639b4b5bb71e5ea76d45b8e2">size</a>(),
<a name="l00135"></a>00135 <span class="stringliteral">"MiniSat::Derivation::registerClause: new clause of different size than old clause of same id"</span>);
<a name="l00136"></a>00136
<a name="l00137"></a>00137 std::set<Lit> oldS;
<a name="l00138"></a>00138 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < old-><a class="code" href="classMiniSat_1_1Clause.html#adf5aa50a639b4b5bb71e5ea76d45b8e2">size</a>(); ++i) {
<a name="l00139"></a>00139 oldS.insert((*old)[i]);
<a name="l00140"></a>00140 }
<a name="l00141"></a>00141
<a name="l00142"></a>00142 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < clause-><a class="code" href="classMiniSat_1_1Clause.html#adf5aa50a639b4b5bb71e5ea76d45b8e2">size</a>(); ++i) {
<a name="l00143"></a>00143 <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(oldS.find((*clause)[i]) != oldS.end(),
<a name="l00144"></a>00144 <span class="stringliteral">"MiniSat::Derivation::registerClause: new clause not subset of old clause of same id"</span>);
<a name="l00145"></a>00145 oldS.erase((*clause)[i]);
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147 <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(oldS.empty(),
<a name="l00148"></a>00148 <span class="stringliteral">"MiniSat::Derivation::registerClause: old clause not subset of new clause of same id"</span>);
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150 <span class="comment">//)</span>
<a name="l00151"></a>00151 <a class="code" href="classMiniSat_1_1Derivation.html#a2c42531abc26a1e8de7f81025e083214">d_clauses</a>[clause-><a class="code" href="classMiniSat_1_1Clause.html#aeb8881da1f982f5bc58bac190ab2f2a4">id</a>()] = clause;
<a name="l00152"></a>00152 };
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="comment">// mark clause as input clause, i.e. true without premises</span>
<a name="l00155"></a><a class="code" href="classMiniSat_1_1Derivation.html#a8f1063fe441a90d388e56ca4002a87e1">00155</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a8f1063fe441a90d388e56ca4002a87e1">registerInputClause</a>(<span class="keywordtype">int</span> clauseID) {
<a name="l00156"></a>00156 <span class="comment">// std::cout << "registerInputClause: " << clauseID << std::endl;</span>
<a name="l00157"></a>00157 <a class="code" href="classMiniSat_1_1Derivation.html#abb29d2dd68d48989190d3356da2d0ae4">d_inputClauses</a>.<a class="code" href="classHash_1_1hash__set.html#a156c40ba629d5aba7f7cacf4eeab1e2d">insert</a>(clauseID);
<a name="l00158"></a>00158 };
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="comment">// clause has been removed from the solver or created internally in Derivation,</span>
<a name="l00161"></a>00161 <span class="comment">// so store it here for later garbage collection.</span>
<a name="l00162"></a><a class="code" href="classMiniSat_1_1Derivation.html#a98bcad6982734612b1afd68e38dea7b8">00162</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a98bcad6982734612b1afd68e38dea7b8">removedClause</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause) {
<a name="l00163"></a>00163 <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(clause != NULL, <span class="stringliteral">"MiniSat::derivation:removedClause: NULL"</span>);
<a name="l00164"></a>00164 <a class="code" href="classMiniSat_1_1Derivation.html#a643c4cd61616c700b5e97c82aa55e062">d_removedClauses</a>.push_back(clause);
<a name="l00165"></a>00165 };
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="comment">// register the inference of a clause; takes ownership of inference</span>
<a name="l00168"></a><a class="code" href="classMiniSat_1_1Derivation.html#a7c0cfa1103212b370236814a4923dec5">00168</a> <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a7c0cfa1103212b370236814a4923dec5">registerInference</a>(<span class="keywordtype">int</span> clauseID, <a class="code" href="classMiniSat_1_1Inference.html">Inference</a>* inference) {
<a name="l00169"></a>00169 <a class="code" href="debug_8h.html#a2637b2fffa22e3c9fad40cda8fcc3bce" title="If something goes horribly wrong, print a message and abort immediately with exit(1).">FatalAssert</a>(!<a class="code" href="classMiniSat_1_1Derivation.html#a5dc6e9795fc769f2c2665b3667dbdc7d">d_inferences</a>.<a class="code" href="classHash_1_1hash__map.html#a48feee7c5690c9cd9ba1b0817ca3ae9f" title="status">contains</a>(clauseID),
<a name="l00170"></a>00170 <span class="stringliteral">"MiniSat::Derivation::registerInference: inference for clauseID already registered"</span>);
<a name="l00171"></a>00171 <span class="comment">// std::cout << "Register inference: " << clauseID << " : " << inference->toString() << std::endl;</span>
<a name="l00172"></a>00172 <a class="code" href="classMiniSat_1_1Derivation.html#a5dc6e9795fc769f2c2665b3667dbdc7d">d_inferences</a>[clauseID] = inference;
<a name="l00173"></a>00173 };
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="comment">// implied is a literal that is implied at the root level.</span>
<a name="l00176"></a>00176 <span class="comment">// return the id of the implying unit clause [literal], if it exists.</span>
<a name="l00177"></a>00177 <span class="comment">//</span>
<a name="l00178"></a>00178 <span class="comment">// otherwise derive it from its reasons and return the new clause id.</span>
<a name="l00179"></a>00179 <span class="comment">// derived unit clauses are stored internally, independently of the Solver</span>
<a name="l00180"></a>00180 <span class="comment">//</span>
<a name="l00181"></a>00181 <span class="comment">// may resolve theory implications with Solver::resolveTheoryImplication</span>
<a name="l00182"></a>00182 <span class="keywordtype">int</span> <a class="code" href="classMiniSat_1_1Derivation.html#ac5cf738303de9c9c2b15d7d9e0b44cce">computeRootReason</a>(<a class="code" href="classMiniSat_1_1Lit.html">Lit</a> implied, <a class="code" href="classMiniSat_1_1Solver.html">Solver</a>* solver);
<a name="l00183"></a>00183
<a name="l00184"></a>00184
<a name="l00185"></a>00185 <span class="comment">// register the empty clause (or a clause falsified in the root level)</span>
<a name="l00186"></a>00186 <span class="comment">// showing that the clause set is unsatisfiable.</span>
<a name="l00187"></a>00187 <span class="comment">//</span>
<a name="l00188"></a>00188 <span class="comment">// if clause is not the empty clause, the empty clause is derived from it,</span>
<a name="l00189"></a>00189 <span class="comment">// possible using computeRootReason</span>
<a name="l00190"></a>00190 <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#ad17e91fe3a421ef68df9463710c5fdc9">finish</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause, <a class="code" href="classMiniSat_1_1Solver.html">Solver</a>* solver);
<a name="l00191"></a>00191
<a name="l00192"></a>00192
<a name="l00193"></a>00193 <span class="comment">// print the derivation of the given clause</span>
<a name="l00194"></a>00194 <span class="comment">//</span>
<a name="l00195"></a>00195 <span class="comment">// output is of the form:</span>
<a name="l00196"></a>00196 <span class="comment">// ID D : L1 ... Ln : C1 K1 C2 K2 ... Cm</span>
<a name="l00197"></a>00197 <span class="comment">// where:</span>
<a name="l00198"></a>00198 <span class="comment">// ID - the id of a clause</span>
<a name="l00199"></a>00199 <span class="comment">// D - 'I' for an input clause, 'D' for a clause derived from other clauses</span>
<a name="l00200"></a>00200 <span class="comment">// Li - the clause literals</span>
<a name="l00201"></a>00201 <span class="comment">// Ci Ki - the clause is derived from these clauses by binary resolution on the given literals</span>
<a name="l00202"></a>00202 <span class="comment">//</span>
<a name="l00203"></a>00203 <span class="comment">// factoring is done after each resolution step, i.e. duplicate literals are removed from the clause.</span>
<a name="l00204"></a>00204 <span class="comment">//</span>
<a name="l00205"></a>00205 <span class="comment">// example:</span>
<a name="l00206"></a>00206 <span class="comment">// 3 D : +12 -2 -33 : 1 +10 2</span>
<a name="l00207"></a>00207 <span class="comment">// says that the clause with the id 3 consists of the literals +12, -2, -33,</span>
<a name="l00208"></a>00208 <span class="comment">// and was derived by resolution between the clauses with ids 1 and 2,</span>
<a name="l00209"></a>00209 <span class="comment">// where the literal +10 is in clause 1 and -10 is in clause 2.</span>
<a name="l00210"></a>00210 <span class="comment">//</span>
<a name="l00211"></a>00211 <span class="comment">// for example, 1 may be the clause +12 +10 -2, and 2 may be -10 -2 -33,</span>
<a name="l00212"></a>00212 <span class="comment">// which resolved on +10 yield the clause +12 -2 -2 -33,</span>
<a name="l00213"></a>00213 <span class="comment">// which after factoring simplified to +12 -2 -33.</span>
<a name="l00214"></a>00214 <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#aec406575f21e97084cffa7c05b566833">printDerivation</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause);
<a name="l00215"></a>00215
<a name="l00216"></a>00216 <span class="comment">// print the derivation of the empty clause.</span>
<a name="l00217"></a>00217 <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#aec406575f21e97084cffa7c05b566833">printDerivation</a>();
<a name="l00218"></a>00218
<a name="l00219"></a>00219 <span class="comment">// for debugging only</span>
<a name="l00220"></a>00220 <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#ac419e5de02d38bdc729487c82fa93de2">checkDerivation</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause);
<a name="l00221"></a>00221
<a name="l00222"></a>00222 <span class="comment">// creates a new proof; ownership transferred to caller</span>
<a name="l00223"></a>00223 <a class="code" href="classSAT_1_1SatProof.html">SAT::SatProof</a>* <a class="code" href="classMiniSat_1_1Derivation.html#a5436a42caaab1bf37d9355c5bd43d251">createProof</a>();
<a name="l00224"></a>00224 <a class="code" href="classSAT_1_1SatProof.html">SAT::SatProof</a>* <a class="code" href="classMiniSat_1_1Derivation.html#a5436a42caaab1bf37d9355c5bd43d251">createProof</a>(<a class="code" href="classMiniSat_1_1Clause.html">Clause</a>* clause);
<a name="l00225"></a>00225
<a name="l00226"></a>00226 <span class="comment">// see Solver::push - clauseID is the highest currently used clause id</span>
<a name="l00227"></a>00227 <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#a9b35e97fb7ff5de171eeb68bfe4dda6b">push</a>(<span class="keywordtype">int</span> clauseID);
<a name="l00228"></a>00228
<a name="l00229"></a>00229 <span class="comment">// see Solver::pop - clauseID corresponds to a clause id used in a push</span>
<a name="l00230"></a>00230 <span class="keywordtype">void</span> <a class="code" href="classMiniSat_1_1Derivation.html#af3782033a2412734e9a018877f71ce5d">pop</a>(<span class="keywordtype">int</span> clauseID);
<a name="l00231"></a>00231 };
<a name="l00232"></a>00232 }
<a name="l00233"></a>00233
<a name="l00234"></a>00234
<a name="l00235"></a>00235 <span class="preprocessor">#endif</span>
</pre></div></div>
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