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45 lines
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<title>throw_bad_result_access<EC> - Boost.Outcome documentation</title>
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<div class="titlepage"><div><div><h1 style="clear: both"><code>throw_bad_result_access<EC></code></h1></div></div></div>
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<p>Policy class defining that <a href="../../reference/types/bad_result_access_with.html" class="api-reference"><code>bad_result_access_with<EC></code></a>
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should be thrown on incorrect wide value observation. The primary purpose of this policy is to enable standing in for
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<a href="https://wg21.link/P0323" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> P0323 <code>std::expected<T, E></code></a>
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which throws a <code>bad_expected_access<E></code> on incorrect wide value observation. This is why it is only ever <code>EC</code> which is thrown with <code>bad_result_access_with<EC></code> on value observation only, and only when there is an error available.</p>
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<p>If used in <code>basic_outcome</code>, and the outcome is exceptioned and so no error is available, incorrect wide value observation performs instead:</p>
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<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_result_access</span><span class="p">(</span><span class="s">"no value"</span><span class="p">));</span>
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</code></pre></div>
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<p>Incorrect wide error observation performs:</p>
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<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_result_access</span><span class="p">(</span><span class="s">"no error"</span><span class="p">));</span>
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</code></pre></div>
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<p>Incorrect wide exception observation performs:</p>
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<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_outcome_access</span><span class="p">(</span><span class="s">"no exception"</span><span class="p">));</span>
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</code></pre></div>
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<p>Inherits publicly from <a href="../../reference/policies/base.html" class="api-reference"><code>base</code></a>
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, and its narrow value, error and exception observer policies are inherited from there.</p>
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<p><em>Requires</em>: Nothing.</p>
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<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
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<p><em>Header</em>: <code><boost/outcome/policy/throw_bad_result_access.hpp></code></p>
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</div><p><small>Last revised: January 23, 2019 at 01:27:31 UTC</small></p>
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