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39 lines
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<title>auto failure(T &&, …) - Boost.Outcome documentation</title>
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<div class="titlepage"><div><div><h1 style="clear: both"><code>auto failure(T &&, ...)</code></h1></div></div></div>
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<p>Returns appropriate type sugar for constructing an unsuccessful result or outcome, usually <a href="../../reference/types/failure_type.html" class="api-reference"><code>failure_type<EC, EP = void></code></a>
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with a decayed <code>T</code>.</p>
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<p>Two default overloads are provided, one taking a single parameter returning <code>failure_type<std::decay_t<T>></code>, the other taking two parameters returning <code>failure_type<std::decay_t<T>, std::decay_t<U>></code>. Both overloads perfectly forward their inputs.</p>
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<p>Note that <code>failure()</code> overloads are permitted by Outcome to return something other than <code>failure_type</code>. For example, <code>basic_result</code>’s <a href="../../reference/types/basic_result/as_failure_lvalue.html" class="api-reference"><code>auto as_failure() const &</code></a>
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returns whatever type <code>failure()</code> returns, and <a href="../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
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by default returns for failure whatever <code>.as_failure()</code> returns. This can be useful to have <code>BOOST_OUTCOME_TRY(...}</code> propagate on failure something custom for some specific input <code>basic_result</code> or <code>basic_outcome</code>.</p>
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<p><em>Overridable</em>: By Argument Dependent Lookup (ADL).</p>
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<p><em>Requires</em>: Always available.</p>
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<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
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<p><em>Header</em>: <code><boost/outcome/success_failure.hpp></code></p>
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</div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
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