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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Regression: std::variant is not a literal type"
href="https://bugs.llvm.org/show_bug.cgi?id=39232">39232</a>
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<th>Summary</th>
<td>Regression: std::variant is not a literal type
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
</tr>
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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>All
</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>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>ldionne@apple.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>The following program does not compile under Clang ToT:
================================================
#include <variant>
struct ValueBase {
protected:
constexpr ValueBase() noexcept { }
constexpr ValueBase(ValueBase const&) noexcept { }
constexpr ValueBase(ValueBase&&) noexcept { }
};
struct NoCtors : ValueBase {
NoCtors() = delete;
NoCtors(NoCtors const&) = delete;
};
int main() {
using V = std::variant<int, NoCtors>;
constexpr V v;
}
================================================
Live reproduction: <a href="https://wandbox.org/permlink/b0trjzltSeq2Hirb">https://wandbox.org/permlink/b0trjzltSeq2Hirb</a>
This reproducer was lifted from libc++'s test case
test/std/utilities/variant/variant.variant/variant.status/index.pass.cpp. It
started failing with Clang's r343131:
Author: Richard Smith <<a href="mailto:richard-llvm@metafoo.co.uk">richard-llvm@metafoo.co.uk</a>>
Date: Wed Sep 26 19:00:16 2018 +0000
P1008R1 Classes with user-declared constructors are never aggregates in
C++20.</pre>
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