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35 lines
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<div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result<T></code></h1></div></div></div>
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<p>If on C++ 20 or the Concepts TS is enabled, a boolean concept matching types which have <code>value_type</code>, <code>error_type</code> and <code>no_value_policy_type</code> member typedefs; that the type is convertible to <code>basic_result<value_type, error_type, no_value_policy_type></code>; that <code>basic_result<value_type, error_type, no_value_policy_type></code> is a base of the type.</p>
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<p>If without Concepts, a static constexpr bool which is true for types matching the same requirements, using a SFINAE based emulation.</p>
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<p>This concept matches any type which provides the same typedefs as a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result<T, E, NoValuePolicy></code></a>
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, has that <code>basic_result</code> as a base class, and is implicitly convertible to <code>basic_result</code>. Whilst not guaranteed, it is very likely that the type is a <code>basic_result</code>, or inherits publicly from a <code>basic_result</code>. If you want something which matches any value-or-error type, consider <a href="../../reference/concepts/value_or_error.html" class="api-reference"><code>value_or_error<T></code></a>
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. If you want something which exactly matches <code>basic_result</code>, use <a href="../../reference/traits/is_basic_result.html" class="api-reference"><code>is_basic_result<T></code></a>
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.</p>
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<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::concepts</code></p>
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<p><em>Header</em>: <code><boost/outcome/basic_result.hpp></code></p>
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</div><p><small>Last revised: May 24, 2020 at 12:48:39 +0100</small></p>
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