48 lines
3.4 KiB
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48 lines
3.4 KiB
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<title>std::error_code error_from_exception(std::exception_ptr &&ep = std::current_exception(), std::error_code not_matched = std::make_error_code(std::errc::resource_unavailable_try_again)) noexcept - Boost.Outcome documentation</title>
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<div class="titlepage"><div><div><h1 style="clear: both"><code>std::error_code error_from_exception(std::exception_ptr &&ep = std::current_exception(), std::error_code not_matched = std::make_error_code(std::errc::resource_unavailable_try_again)) noexcept</code></h1></div></div></div>
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<p>This function saves writing boilerplate by rethrowing <code>ep</code> within a <code>try</code>
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block, with a long sequence of <code>catch()</code> handlers, one for every standard
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C++ exception type which has a near or exact equivalent code in
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<a href="https://en.cppreference.com/w/cpp/error/errc" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::errc</code></a>
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.</p>
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<p>If matched, <code>ep</code> is set to a default constructed
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<a href="https://en.cppreference.com/w/cpp/error/exception_ptr" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::exception_ptr</code></a>
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,
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and a
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<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
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is constructed using the ADL discovered free
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function <code>make_error_code()</code> upon the <code>std::errc</code> enumeration value matching the
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thrown exception.</p>
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<p>If not matched, <code>ep</code> is left intact, and the <code>not_matched</code> error code supplied
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is returned instead.</p>
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<p><em>Overridable</em>: Not overridable.</p>
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<p><em>Requires</em>: C++ exceptions to be globally enabled.</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/utils.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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