https://bugs.llvm.org/show_bug.cgi?id=44398
Bug ID: 44398
Summary: Unqualified calls of std::ref lead to ADL issues
Product: libc++
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: arthur.j.odw...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
https://bugs.llvm.org/show_bug.cgi?id=20092 is related, but for `get` instead
of `ref`.
// https://gcc.godbolt.org/z/8VfprT
#include <functional>
struct S {
friend void ref(S);
friend void deref(S);
};
int main() {
S s;
auto rw = std::ref(s); // OK
auto rw2 = std::ref(rw); // massive error spew
}
Currently <__functional_base> has
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
reference_wrapper<_Tp>
ref(reference_wrapper<_Tp> __t) _NOEXCEPT
{
return ref(__t.get());
}
It should have
return _VSTD::ref(__t.get());
or simply (LWG 3146)
return __t;
There's also an unqualified ADL `ref` in <memory>:
// https://gcc.godbolt.org/z/EHw3Gy
#include <memory>
#include <utility>
struct D {
void operator()(int *) const;
friend void ref(D);
friend void deref(D);
};
int main() {
D d;
std::unique_ptr<int, D&> u(nullptr, d);
std::shared_ptr<int> s = std::move(u);
}
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