[llvm-bugs] [Bug 44449] New: Implicit conversion error, adding qualifiers (non-const to const), with reference to array.

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jan 3 00:54:38 PST 2020


https://bugs.llvm.org/show_bug.cgi?id=44449

            Bug ID: 44449
           Summary: Implicit conversion error, adding qualifiers
                    (non-const to const), with reference to array.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: choon-ho.choe at vitrox.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

As title, refer to example, https://godbolt.org/z/yFx-Zz

/////////////////////////////////

#include <type_traits>

void f(const void* const (*)[1]);

void g(const void* const (&)[1]);

void test()
{
    static_assert(std::is_convertible<void* (*)[], const void* const
(*)[]>::value, ""); // fails in msvc.
    static_assert(std::is_convertible<void* (&)[], const void* const
(&)[]>::value, ""); // fails in msvc, clang.

    void* x[1];

    f(&x); // fails in msvc.
    g( x); // fails in msvc, clang.
}

/////////////////////////////////

MSVC aside, GCC (trunk) passes both cases, Clang rejects the reference case.
I find this inconsistency weird, could this be a potential bug or the language
left it unspecified.

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