[Bug libstdc++/111327] std::bind_front (and std::not_fn) doesn't always perfectly forward according to value category of the call wrapper object

[de34 at live dot cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111327

Jiang An <de34 at live dot cn> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |de34 at live dot cn

--- Comment #5 from Jiang An <de34 at live dot cn> ---
The current fix doesn't seem sufficient (https://godbolt.org/z/rs5oYxjTc):

#include <functional>
#include <utility>

struct Weird {
    void operator()() {}
    bool operator()() const { return true; }
};

int main()
{
    auto nf = std::not_fn(Weird{});
    nf(); // should be rejected, but calls the const overload
    std::as_const(nf)();
}