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<div class="title">status_macros.h</div> </div>
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<a href="status__macros_8h.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">// Copyright 2010-2018 Google LLC</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// You may obtain a copy of the License at</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// See the License for the specific language governing permissions and</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// limitations under the License.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#ifndef OR_TOOLS_BASE_STATUS_MACROS_H_</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#define OR_TOOLS_BASE_STATUS_MACROS_H_</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "absl/status/status.h"</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include "absl/status/statusor.h"</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">namespace </span><a class="code" href="namespaceabsl.html">absl</a> {</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// Run a command that returns a absl::Status. If the called code returns an</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// error status, return that status up out of this method too.</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// Example:</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">// RETURN_IF_ERROR(DoThings(4));</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="status__macros_8h.html#acdc223d8c59d5c591dc6b4e88257627b"> 27</a></span> <span class="preprocessor">#define RETURN_IF_ERROR(expr) \</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor"> do { \</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor"> </span><span class="comment">/* Using _status below to avoid capture problems if expr is "status". */</span><span class="preprocessor"> \</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor"> const ::absl::Status _status = (expr); \</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor"> if (!_status.ok()) return _status; \</span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor"> } while (0)</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// Internal helper for concatenating macro values.</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="status__macros_8h.html#ade3b99b542ec8f9cd84e438fb3759929"> 35</a></span> <span class="preprocessor">#define STATUS_MACROS_CONCAT_NAME_INNER(x, y) x##y</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="status__macros_8h.html#adfa1b5068b2bb4dcfd48879d7af43e21"> 36</a></span> <span class="preprocessor">#define STATUS_MACROS_CONCAT_NAME(x, y) STATUS_MACROS_CONCAT_NAME_INNER(x, y)</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  </div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
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<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="namespaceabsl.html#a604a347b8b2f7cad73343e3959f7de7d"> 39</a></span> ::absl::Status <a class="code" href="namespaceabsl.html#a604a347b8b2f7cad73343e3959f7de7d">DoAssignOrReturn</a>(T& lhs, ::absl::StatusOr<T> result) { <span class="comment">// NOLINT</span></div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">if</span> (result.ok()) {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  lhs = result.value();</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  }</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">return</span> result.status();</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> }</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  </div>
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<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="status__macros_8h.html#afa5b28a30dd7715c6a827f42f936e9b0"> 46</a></span> <span class="preprocessor">#define ASSIGN_OR_RETURN_IMPL(status, lhs, rexpr) \</span></div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor"> ::absl::Status status = DoAssignOrReturn(lhs, (rexpr)); \</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor"> if (!status.ok()) return status;</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// Executes an expression that returns an absl::StatusOr, extracting its value</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">// into the variable defined by lhs (or returning on error).</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment">// Example: Assigning to an existing value</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">// ValueType value;</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">// ASSIGN_OR_RETURN(value, MaybeGetValue(arg));</span></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">// WARNING: ASSIGN_OR_RETURN expands into multiple statements; it cannot be used</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">// in a single statement (e.g. as the body of an if statement without {})!</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="status__macros_8h.html#a600de4b8f65fe0a4b1898041634f9011"> 59</a></span> <span class="preprocessor">#define ASSIGN_OR_RETURN(lhs, rexpr) \</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor"> ASSIGN_OR_RETURN_IMPL( \</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor"> STATUS_MACROS_CONCAT_NAME(_status_or_value, __COUNTER__), lhs, rexpr);</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> } <span class="comment">// namespace absl</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#endif </span><span class="comment">// OR_TOOLS_BASE_STATUS_MACROS_H_</span></div>
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<div class="ttc" id="anamespaceabsl_html"><div class="ttname"><a href="namespaceabsl.html">absl</a></div><div class="ttdef"><b>Definition:</b> <a href="cleanup_8h_source.html#l00022">cleanup.h:22</a></div></div>
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<div class="ttc" id="anamespaceabsl_html_a604a347b8b2f7cad73343e3959f7de7d"><div class="ttname"><a href="namespaceabsl.html#a604a347b8b2f7cad73343e3959f7de7d">absl::DoAssignOrReturn</a></div><div class="ttdeci">::absl::Status DoAssignOrReturn(T &lhs, ::absl::StatusOr< T > result)</div><div class="ttdef"><b>Definition:</b> <a href="status__macros_8h_source.html#l00039">status_macros.h:39</a></div></div>
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