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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Rejects valid code with requires clause accepting bool expression on copy / move"
href="https://bugs.llvm.org/show_bug.cgi?id=44657">44657</a>
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<th>Summary</th>
<td>Rejects valid code with requires clause accepting bool expression on copy / move
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david@doublewise.net
</td>
</tr>
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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>The following code
```
template<typename>
constexpr bool true_ = true;
template<typename Ts>
struct s {
s(int)
{
}
s(s const &) requires(true_<Ts>) {}
};
auto v = s<int>(5);
```
Outputs
```
main.cpp:11:24: error: substitution into constraint expression resulted in a
non-constant expression
s(s const &) requires(true_<Ts>) {}
^~~~~~~~~
main.cpp:11:24: note: subexpression not valid in a constant expression
1 error generated.
```
When compiled with `clang++ -std=c++2a -o /dev/null -c main.cpp`
The error goes away if I define `true_` as a concept rather than a bool. This
seems to apply only to copy / move constructors / assignment operators.</pre>
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