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try_operation_return_as.html

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  3. <title>decltype(auto) try_operation_return_as(X) - Boost.Outcome documentation</title>
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  13.   <div class="titlepage"><div><div><h1 style="clear: both"><code>decltype(auto) try_operation_return_as(X)</code></h1></div></div></div>
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  14.   <p>This default implementation preferentially returns whatever the input type&rsquo;s <code>.as_failure()</code> member function returns.
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  15. <code>basic_result</code> and <code>basic_outcome</code> provide such a member function, see <a href="../../reference/types/basic_result/as_failure_lvalue.html" class="api-reference"><code>auto as_failure() const &amp;</code></a>
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  16. .</p>
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  18. <p>If <code>.as_failure()</code> is not available, it will also match any <code>.error()</code> member function, which it wraps into a failure type sugar using <a href="../../reference/functions/failure.html" class="api-reference"><code>failure(T &amp;&amp;, ...)</code></a>
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  19. .</p>
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  21. <p><em>Requires</em>: That the expression <code>std::declval&lt;T&gt;().as_failure()</code> and/or <code>std::declval&lt;T&gt;().error()</code> is a valid expression.</p>
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  23. <p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
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  25. <p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
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  28.         </div><p><small>Last revised: June 20, 2019 at 11:14:48 &#43;0100</small></p>
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