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tryv_failure_likely.html

tryv_failure_likely.html 3.9 KB
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  3. <title>BOOST_OUTCOME_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_TRY_FAILURE_LIKELY(expr) - Boost.Outcome documentation</title>
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  13.   <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_TRY_FAILURE_LIKELY(expr)</code></h1></div></div></div>
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  14.   <p>Evaluate an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
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  15.  from the calling function if unsuccessful:</p>
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  17. <ul>
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  18. <li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
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  19. </li>
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  20. <li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
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  21. </li>
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  22. <li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
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  23. </li>
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  26. <p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
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  28. <p>The difference between the <code>BOOST_OUTCOME_TRYV(expr)</code> and <code>BOOST_OUTCOME_TRY(expr)</code> editions is that the latter will set a variable if two or more macro arguments are present (see <a href="../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
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  29. ). The former requires the <code>T</code> to be <code>void</code>.</p>
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  31. <p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)</code></a>
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  32.  instead.</p>
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  34. <p><em>Overridable</em>: Not overridable.</p>
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  36. <p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>auto &amp;&amp;</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
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  38. <p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
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  41.         </div><p><small>Last revised: October 16, 2019 at 10:26:35 &#43;0100</small></p>
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