https://bugs.llvm.org/show_bug.cgi?id=39232
Bug ID: 39232
Summary: Regression: std::variant is not a literal type
Product: libc++
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: ldio...@apple.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com,
richard-l...@metafoo.co.uk
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: https://wandbox.org/permlink/b0trjzltSeq2Hirb
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 <richard-l...@metafoo.co.uk>
Date: Wed Sep 26 19:00:16 2018 +0000
P1008R1 Classes with user-declared constructors are never aggregates in
C++20.
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