https://bugs.llvm.org/show_bug.cgi?id=43732
Bug ID: 43732
Summary: static constexpr member is not a constant expression
when read from a reference
Product: clang
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++17
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
#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
https://godbolt.org/z/NiIz02
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