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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang allows structured binding of a closure object inside its operator()"
href="https://bugs.llvm.org/show_bug.cgi?id=41765">41765</a>
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<th>Summary</th>
<td>Clang allows structured binding of a closure object inside its operator()
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Keywords</th>
<td>accepts-invalid
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++'17
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>language.lawyer@gmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Since <a href="https://wg21.link/P0969R0">https://wg21.link/P0969R0</a> (implemented in [1]) structured binding of a
class does not rely on publicity of the members, only accessibility. So it is
possible to decompose a closure from the inside of its operator().
int main()
{
int x = 1, y = 2;
auto f = [&](auto self) {
(void)x; (void)y; // make 'em used!
auto& [a, b] = *self; // a == 1, b == 2. Depends on the
previous line.
return b - a;
};
return f(&f); // returns 1
}
<a href="https://wandbox.org/permlink/CVlWjnDHPPMbRT2r">https://wandbox.org/permlink/CVlWjnDHPPMbRT2r</a>
[1]
<a href="https://github.com/llvm/llvm-project/commit/5c9b3b757623e6bea5b4929b2046a565ee2d11bc">https://github.com/llvm/llvm-project/commit/5c9b3b757623e6bea5b4929b2046a565ee2d11bc</a></pre>
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</p>
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