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14  <div class="titlepage"><div><div><h1 style="clear: both">Concepts</h1></div></div></div>
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16	<a href="../reference/concepts/basic_outcome.html" ><code>basic_outcome&lt;T&gt;</code></a>
17<p>A boolean concept matching types which are convertible to a <code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code>.</p><li>
18	<a href="../reference/concepts/basic_result.html" ><code>basic_result&lt;T&gt;</code></a>
19<p>A boolean concept matching types which are convertible to a <code>basic_result&lt;T, E, NoValuePolicy&gt;</code>.</p><li>
20	<a href="../reference/concepts/value_or_error.html" ><code>value_or_error&lt;T&gt;</code></a>
21<p>A boolean concept matching types with either a value or an error.</p><li>
22	<a href="../reference/concepts/value_or_none.html" ><code>value_or_none&lt;T&gt;</code></a>
23<p>A boolean concept matching types with an optional value.</p></li></ol>
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32        </div><p><small>Last revised: December 11, 2018 at 14:56:04 UTC</small></p>
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