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<div id="projectbrief">C API for clingo providing high level functions to control grounding and solving.</div>
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<p>The example shows how to iteratively enumerate models.</p><h2>Output</h2>
<div class="fragment"><div class="line">./solve-iteratively 0</div><div class="line">Model: a</div><div class="line">Model: b</div></div><!-- fragment --><h2>Code</h2>
<div class="fragment"><div class="line"><span class="preprocessor">#include <<a class="code" href="clingo_8h.html">clingo.h</a>></span></div><div class="line"><span class="preprocessor">#include <stdlib.h></span></div><div class="line"><span class="preprocessor">#include <stdio.h></span></div><div class="line"></div><div class="line"><span class="keywordtype">bool</span> print_model(<a class="code" href="group__Model.html#gaaf9a93819f023f3cb8aa80598c46556b">clingo_model_t</a> *model) {</div><div class="line"> <span class="keywordtype">bool</span> ret = <span class="keyword">true</span>;</div><div class="line"> <a class="code" href="group__Symbols.html#ga6c75c60fa57c3b97505265ff08f6f951">clingo_symbol_t</a> *atoms = NULL;</div><div class="line"> <span class="keywordtype">size_t</span> atoms_n;</div><div class="line"> <a class="code" href="group__Symbols.html#ga6c75c60fa57c3b97505265ff08f6f951">clingo_symbol_t</a> <span class="keyword">const</span> *it, *ie;</div><div class="line"> <span class="keywordtype">char</span> *str = NULL;</div><div class="line"> <span class="keywordtype">size_t</span> str_n = 0;</div><div class="line"></div><div class="line"> <span class="comment">// determine the number of (shown) symbols in the model</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a0"></a><a class="code" href="group__Model.html#ga6fd012a9b6deb0d743701ceba35b65ec">clingo_model_symbols_size</a>(model, <a name="a1"></a><a class="code" href="group__Model.html#ggaa943fe81f0874ea63820b627bc19845ca82a698ef41cd919cb370d22fc0b44826">clingo_show_type_shown</a>, &atoms_n)) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> <span class="comment">// allocate required memory to hold all the symbols</span></div><div class="line"> <span class="keywordflow">if</span> (!(atoms = (<a class="code" href="group__Symbols.html#ga6c75c60fa57c3b97505265ff08f6f951">clingo_symbol_t</a>*)malloc(<span class="keyword">sizeof</span>(*atoms) * atoms_n))) {</div><div class="line"> <a name="a2"></a><a class="code" href="group__BasicTypes.html#ga861bc86ccee813d744920ac0de35ee11">clingo_set_error</a>(<a name="a3"></a><a class="code" href="group__BasicTypes.html#gga5adba1f5e366e7489ac4a3fb5266dba6aa14a0926eb3e653fcc13299b33d8d348">clingo_error_bad_alloc</a>, <span class="stringliteral">"could not allocate memory for atoms"</span>);</div><div class="line"> <span class="keywordflow">goto</span> error;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">// retrieve the symbols in the model</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a4"></a><a class="code" href="group__Model.html#gaa32137ad8fa747f5fa5dae3345ddf982">clingo_model_symbols</a>(model, <a class="code" href="group__Model.html#ggaa943fe81f0874ea63820b627bc19845ca82a698ef41cd919cb370d22fc0b44826">clingo_show_type_shown</a>, atoms, atoms_n)) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> printf(<span class="stringliteral">"Model:"</span>);</div><div class="line"></div><div class="line"> <span class="keywordflow">for</span> (it = atoms, ie = atoms + atoms_n; it != ie; ++it) {</div><div class="line"> <span class="keywordtype">size_t</span> n;</div><div class="line"> <span class="keywordtype">char</span> *str_new;</div><div class="line"></div><div class="line"> <span class="comment">// determine size of the string representation of the next symbol in the model</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a5"></a><a class="code" href="group__Symbols.html#gafba05ee305c698c687390ed2ee4f1562">clingo_symbol_to_string_size</a>(*it, &n)) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (str_n < n) {</div><div class="line"> <span class="comment">// allocate required memory to hold the symbol's string</span></div><div class="line"> <span class="keywordflow">if</span> (!(str_new = (<span class="keywordtype">char</span>*)realloc(str, <span class="keyword">sizeof</span>(*str) * n))) {</div><div class="line"> <a class="code" href="group__BasicTypes.html#ga861bc86ccee813d744920ac0de35ee11">clingo_set_error</a>(<a class="code" href="group__BasicTypes.html#gga5adba1f5e366e7489ac4a3fb5266dba6aa14a0926eb3e653fcc13299b33d8d348">clingo_error_bad_alloc</a>, <span class="stringliteral">"could not allocate memory for symbol's string"</span>);</div><div class="line"> <span class="keywordflow">goto</span> error;</div><div class="line"> }</div><div class="line"></div><div class="line"> str = str_new;</div><div class="line"> str_n = n;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">// retrieve the symbol's string</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a6"></a><a class="code" href="group__Symbols.html#ga7990b41b229320ac158fc428fa366000">clingo_symbol_to_string</a>(*it, str, n)) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> printf(<span class="stringliteral">" %s"</span>, str);</div><div class="line"> }</div><div class="line"></div><div class="line"> printf(<span class="stringliteral">"\n"</span>);</div><div class="line"> <span class="keywordflow">goto</span> out;</div><div class="line"></div><div class="line">error:</div><div class="line"> ret = <span class="keyword">false</span>;</div><div class="line"></div><div class="line">out:</div><div class="line"> <span class="keywordflow">if</span> (atoms) { free(atoms); }</div><div class="line"> <span class="keywordflow">if</span> (str) { free(str); }</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> ret;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> <span class="keyword">const</span> **argv) {</div><div class="line"> <span class="keywordtype">char</span> <span class="keyword">const</span> *error_message;</div><div class="line"> <span class="keywordtype">int</span> ret = 0;</div><div class="line"> <a class="code" href="group__SolveIter.html#gaa3c0489d80175f3f2a51a2a8f7cb9d03">clingo_solve_iteratively_t</a> *it = NULL;</div><div class="line"> <a class="code" href="group__Model.html#gaaf9a93819f023f3cb8aa80598c46556b">clingo_model_t</a> *model;</div><div class="line"> <a class="code" href="group__Control.html#gaf008e9db9dbb37b0b7ef039bb9d582f0">clingo_control_t</a> *ctl = NULL;</div><div class="line"> <a name="_a7"></a><a class="code" href="structclingo__part.html">clingo_part_t</a> parts[] = {{ <span class="stringliteral">"base"</span>, NULL, 0 }};</div><div class="line"></div><div class="line"> <span class="comment">// create a control object and pass command line arguments</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a8"></a><a class="code" href="group__Control.html#ga46254f92ddf864a5214cf1572402e2bc">clingo_control_new</a>(argv+1, argc-1, NULL, NULL, 20, &ctl) != 0) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> <span class="comment">// add a logic program to the base part</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a9"></a><a class="code" href="group__Control.html#gab65cc073ff9dbf71e53b71fb14bc9ec7">clingo_control_add</a>(ctl, <span class="stringliteral">"base"</span>, NULL, 0, <span class="stringliteral">"a :- not b. b :- not a."</span>)) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> <span class="comment">// ground the base part</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a10"></a><a class="code" href="group__Control.html#gad0d95c5766649ff2f00e4ee3507a679f">clingo_control_ground</a>(ctl, parts, 1, NULL, NULL)) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> <span class="comment">// solve using a model callback</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a11"></a><a class="code" href="group__Control.html#gab23442dc7576126b78422fc0554bf11d">clingo_control_solve_iteratively</a>(ctl, NULL, 0, &it)) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> <span class="keywordflow">for</span> (;;) {</div><div class="line"> <span class="comment">// get the next model</span></div><div class="line"> <span class="keywordflow">if</span> (!<a name="a12"></a><a class="code" href="group__SolveIter.html#gab01a023960eca822843cd323ff21db0e">clingo_solve_iteratively_next</a>(it, &model)) { <span class="keywordflow">goto</span> error; }</div><div class="line"></div><div class="line"> <span class="comment">// stop if the search space has been exhausted or the requested number of models found</span></div><div class="line"> <span class="keywordflow">if</span> (!model) { <span class="keywordflow">break</span>; }</div><div class="line"> <span class="keywordflow">if</span> (!print_model(model)) { <span class="keywordflow">goto</span> error; }</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordflow">goto</span> out;</div><div class="line"></div><div class="line">error:</div><div class="line"> <span class="keywordflow">if</span> (!(error_message = <a name="a13"></a><a class="code" href="group__BasicTypes.html#ga9732caf39396e15e7a2eb0e01d1a71b0">clingo_error_message</a>())) { error_message = <span class="stringliteral">"error"</span>; }</div><div class="line"></div><div class="line"> printf(<span class="stringliteral">"%s\n"</span>, error_message);</div><div class="line"> ret = <a name="a14"></a><a class="code" href="group__BasicTypes.html#ga94ce73fd010c0dbad708901a472f2c7a">clingo_error_code</a>();</div><div class="line"></div><div class="line">out:</div><div class="line"> <span class="keywordflow">if</span> (it) { <a name="a15"></a><a class="code" href="group__SolveIter.html#ga68671ff8611ff144adc24f5b809a1a3a">clingo_solve_iteratively_close</a>(it); }</div><div class="line"> <span class="keywordflow">if</span> (ctl) { <a name="a16"></a><a class="code" href="group__Control.html#gad1c4e8f6be76e1d3d8e34d71363dd067">clingo_control_free</a>(ctl); }</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> ret;</div><div class="line">}</div><div class="line"></div></div><!-- fragment --> </div><!-- contents -->
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