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- <div class="titlepage"><div><div><h1 style="clear: both"><code>failure_type<EC, EP = void></code></h1></div></div></div>
- <p>Type sugar for constructing an unsuccessful result or outcome. Generally not constructed directly, but via the free function <a href="../../reference/functions/failure.html" class="api-reference"><code>failure(T &&, ...)</code></a>
- . Detectable using <a href="../../reference/traits/is_failure_type.html" class="api-reference"><code>is_failure_type<T></code></a>
- .</p>
- <p>This is a regular wrapper type, with defaulted default, copy and move constructor, defaulted assignment, and defaulted destructor.</p>
- <p>Member type aliases <code>error_type</code> and <code>exception_type</code> indicate <code>EC</code> and <code>E</code>.</p>
- <p>There is an explicit initialising constructor taking any types <code>U</code> and <code>V</code> which will forward construct the contained <code>error_type</code> and <code>exception_type</code> respectively.</p>
- <p>There are two tagged initialising constructors taking <code>in_place_type_t<error_type></code> or <code>in_place_type_t<exception_type></code>, and a <code>U</code> which will forward construct the contained <code>error_type</code> and <code>exception_type</code> respectively.</p>
- <p>There are <code>.error()</code> and <code>.exception()</code> reference observers with the usual constexpr lvalue, const lvalue, rvalue and const rvalue overloads. One can discover which or both of these is valid using the usual <code>.has_error()</code> and <code>.has_exception()</code> observers.</p>
- <p>There are specialisations <code>failure_type<EC, void></code> and <code>failure_type<void, E></code> which store nothing for the voided type and do not provide their observer functions.</p>
- <p><em>Requires</em>: Nothing.</p>
- <p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
- <p><em>Header</em>: <code><boost/outcome/success_failure.hpp></code></p>
- </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
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