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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - parameter passed to std::packaged_task byref stays wrapped with std::reference_wrapper"
href="https://bugs.llvm.org/show_bug.cgi?id=41032">41032</a>
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<th>Summary</th>
<td>parameter passed to std::packaged_task byref stays wrapped with std::reference_wrapper
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>kirshamir@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
<div>
<pre>auto task = std::packaged_task<int(const std::vector<int>&)>{
[] (const auto& vec) {
// clang pass into the method std::reference_wrapper
// correct behavior should be to unwrap it
return std::accumulate(vec.get().begin(), vec.get().end(), 0);
}};
// Code above works only because of the call to 'get' to retrieve the content
of the std::reference_wrapper
// Call the task with some std::vector<int> named vec:
std::thread t = std::thread(std::move(task), std::cref(vec));
Full code:
<a href="http://coliru.stacked-crooked.com/a/cc3b2c44ef5d9834">http://coliru.stacked-crooked.com/a/cc3b2c44ef5d9834</a></pre>
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