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<li class="navelem"><a class="el" href="../../dir_3f8eec2fc361645de4b1ec14c19fffc7.html">packager</a></li><li class="navelem"><a class="el" href="../../dir_f99dae54fe7170f791f339b952d5067a.html">media</a></li><li class="navelem"><a class="el" href="../../dir_e3bda0bde998a4d5063328245b9909be.html">base</a></li> </ul>
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<div class="title">macros.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2016 Google Inc. All rights reserved.</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Use of this source code is governed by a BSD-style</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// license that can be found in the LICENSE file or at</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// https://developers.google.com/open-source/licenses/bsd</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#ifndef PACKAGER_MEDIA_BASE_MACROS_H_</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#define PACKAGER_MEDIA_BASE_MACROS_H_</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// The FALLTHROUGH_INTENDED macro can be used to annotate implicit fall-through</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// between switch labels:</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// switch (x) {</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// case 40:</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// case 41:</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// if (truth_is_out_there) {</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// ++x;</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// FALLTHROUGH_INTENDED; // Use instead of/along with annotations in</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// // comments.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">// } else {</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// return x;</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// }</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// case 42:</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// ...</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">//</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// As shown in the example above, the FALLTHROUGH_INTENDED macro should be</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">// followed by a semicolon. It is designed to mimic control-flow statements</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// like 'break;', so it can be placed in most places where 'break;' can, but</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// only if there are no statements on the execution path between it and the</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// next switch label.</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">//</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// When compiled with clang in C++11 mode, the FALLTHROUGH_INTENDED macro is</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// expanded to [[clang::fallthrough]] attribute, which is analysed when</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// performing switch labels fall-through diagnostic ('-Wimplicit-fallthrough').</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// See clang documentation on language extensions for details:</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// http://clang.llvm.org/docs/AttributeReference.html#fallthrough-clang-fallthrough</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">//</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// When used with unsupported compilers, the FALLTHROUGH_INTENDED macro has no</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// effect on diagnostics.</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">//</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">// In either case this macro has no effect on runtime behavior and performance</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">// of code.</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#if defined(__clang__) && __cplusplus >= 201103L && defined(__has_warning)</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#define FALLTHROUGH_INTENDED [[clang::fallthrough]] // NOLINT</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#ifndef FALLTHROUGH_INTENDED</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#define FALLTHROUGH_INTENDED \</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor"> do { \</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor"> } while (0)</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor">#endif // PACKAGER_MEDIA_BASE_MACROS_H_</span></div></div><!-- fragment --></div><!-- contents -->
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