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| <a href="foreach_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div> |
| <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// You may obtain a copy of the License at</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div> |
| <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// See the License for the specific language governing permissions and</span></div> |
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// limitations under the License.</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#ifndef __STOUT_FOREACH_HPP__</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor"></span><span class="preprocessor">#define __STOUT_FOREACH_HPP__</span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor"></span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <tuple></span></div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <utility></span></div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <<a class="code" href="preprocessor_8hpp.html">stout/preprocessor.hpp</a>></span></div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div> |
| <div class="line"><a name="l00021"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#a490273631f7a87286eb97e039acb6bd7"> 21</a></span> <span class="preprocessor">#define STOUT_FOREACH_PREFIX CAT(__foreach_, __LINE__)</span></div> |
| <div class="line"><a name="l00022"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#ad1515a2099bf691516e3567e1b2daabe"> 22</a></span> <span class="preprocessor"></span><span class="preprocessor">#define STOUT_FOREACH_BODY CAT(STOUT_FOREACH_PREFIX, _body__)</span></div> |
| <div class="line"><a name="l00023"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#ab5b9d86a4dd670c4d943f19eaa034a95"> 23</a></span> <span class="preprocessor"></span><span class="preprocessor">#define STOUT_FOREACH_BREAK CAT(STOUT_FOREACH_PREFIX, _break__)</span></div> |
| <div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#a37bb3270a89730b267c724f02da6a4a3"> 24</a></span> <span class="preprocessor"></span><span class="preprocessor">#define STOUT_FOREACH_CONTINUE CAT(STOUT_FOREACH_PREFIX, _continue__)</span></div> |
| <div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#a10a782133408245cc954deb9dbe9feee"> 25</a></span> <span class="preprocessor"></span><span class="preprocessor">#define STOUT_FOREACH_ELEM CAT(STOUT_FOREACH_PREFIX, _elem__)</span></div> |
| <div class="line"><a name="l00026"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#abbdcadceed9418ae9dc025a1205bafa9"> 26</a></span> <span class="preprocessor"></span><span class="preprocessor">#define STOUT_FOREACH_ONCE CAT(STOUT_FOREACH_PREFIX, _once__)</span></div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor"></span></div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// `foreach` is a trivial expansion to the range-based `for`.</span></div> |
| <div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#abc57d06899e91a60a3a35de756d337ba"> 30</a></span> <span class="preprocessor">#define foreach(ELEM, ELEMS) for (ELEM : ELEMS)</span></div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor"></span></div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// `foreachpair` is used to unpack the key and value of the pairs coming out of</span></div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// a sequence. e.g., std::map.</span></div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// Control flow:</span></div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// Labels:</span></div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">// * `STOUT_FOREACH_BREAK` is the label that when jumped to, breaks out of</span></div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">// the loop.</span></div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">// * `STOUT_FOREACH_BODY` is the label that helps to skip the loop exit checks</span></div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// (break or continue) until we finish the current iteration.</span></div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">// Flags:</span></div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">// * `STOUT_FOREACH_CONTINUE` determines whether the loop should continue or</span></div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment">// not. If we encounter a `break`, this will be `false`. If we encounter a</span></div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// `continue` or run the current iteration to completion,</span></div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// `STOUT_FOREACH_CONTINUE` will be set to `true`.</span></div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// * `STOUT_FOREACH_ONCE` is used to execute a `for` loop exactly once.</span></div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#a66900b166526abe66464d6597536b111"> 51</a></span> <span class="preprocessor">#define foreachpair(KEY, VALUE, ELEMS) \</span></div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor"> foreach (auto&& STOUT_FOREACH_ELEM, ELEMS) \</span></div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor"> if (false) STOUT_FOREACH_BREAK: break; </span><span class="comment">/* set up the break path */</span><span class="preprocessor"> \</span></div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor"> else if (bool STOUT_FOREACH_CONTINUE = false) {} </span><span class="comment">/* var decl */</span><span class="preprocessor"> \</span></div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor"> else if (true) goto STOUT_FOREACH_BODY; </span><span class="comment">/* skip the loop exit checks */</span><span class="preprocessor"> \</span></div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor"> else for (;;) </span><span class="comment">/* determine whether we should break or continue. */</span><span class="preprocessor"> \</span></div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor"> if (!STOUT_FOREACH_CONTINUE) goto STOUT_FOREACH_BREAK; </span><span class="comment">/* break */</span><span class="preprocessor"> \</span></div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor"> else if (true) break; </span><span class="comment">/* continue */</span><span class="preprocessor"> \</span></div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor"> else \</span></div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor"> STOUT_FOREACH_BODY: \</span></div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor"> if (bool STOUT_FOREACH_ONCE = false) {} </span><span class="comment">/* var decl */</span><span class="preprocessor"> \</span></div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor"> else for (KEY = std::get<0>( \</span></div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor"> std::forward<decltype(STOUT_FOREACH_ELEM)>( \</span></div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor"> STOUT_FOREACH_ELEM)); \</span></div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor"> !STOUT_FOREACH_ONCE; \</span></div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor"> STOUT_FOREACH_ONCE = true) \</span></div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor"> for (VALUE = std::get<1>( \</span></div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor"> std::forward<decltype(STOUT_FOREACH_ELEM)>( \</span></div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor"> STOUT_FOREACH_ELEM)); \</span></div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor"> !STOUT_FOREACH_CONTINUE; \</span></div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor"> STOUT_FOREACH_CONTINUE = true)</span></div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor"></span></div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div> |
| <div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#acac417231a256d7c6164a86db970da86"> 74</a></span> <span class="preprocessor">#define foreachkey(KEY, ELEMS) foreachpair (KEY, std::ignore, ELEMS)</span></div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="preprocessor"></span></div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div> |
| <div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="foreach_8hpp.html#a28670619e64a84270d76f07b0f6eb3b6"> 77</a></span> <span class="preprocessor">#define foreachvalue(VALUE, ELEMS) foreachpair (std::ignore, VALUE, ELEMS)</span></div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor"></span></div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#endif // __STOUT_FOREACH_HPP__</span></div> |
| <div class="ttc" id="preprocessor_8hpp_html"><div class="ttname"><a href="preprocessor_8hpp.html">preprocessor.hpp</a></div></div> |
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