<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - static constexpr member is not a constant expression when read from a reference"
href="https://bugs.llvm.org/show_bug.cgi?id=43732">43732</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>static constexpr member is not a constant expression when read from a reference
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>9.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++17
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jonathan.poelen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>#include <type_traits>
struct A
{
static constexpr std::true_type value {};
};
int main()
{
A a;
A& ref = a;
auto v = ref.value;
constexpr bool r1 = a.value; //ok
constexpr bool r2 = ref.value; // error
constexpr bool r3 = v; // ok
}
This works with GCC and MSVC
<a href="https://godbolt.org/z/NiIz02">https://godbolt.org/z/NiIz02</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>