[llvm-bugs] [Bug 26685] New: Possibility for function with cv-qualifier-seq be adjusted to function pointer

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26685

            Bug ID: 26685
           Summary: Possibility for function with cv-qualifier-seq be
                    adjusted to function pointer
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: droffset at yandex.ru
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Hello!

Simple code:

template <typename T>
struct test
{
    typedef void(* type)(T);
};

typedef void foo_t() const;

typedef test<foo_t>::type func_t; 

We've got a function type with cv-qualifier-seq acquires the properties of a
function pointer, although it's prohibited by Standard. This behavior occurs in
the entire range of compilers. 

Do I understand right that func_t (in this case) is invalid type, and it
shouldn't be compiled?
So we can use it to bypass the restrictions and create a pointer to
cv-qualified function:

template <typename F>
struct create_pointer
{
    typedef void func_t(F);

    template <typename X>
    struct extract 
    { typedef X type; };
    template <typename X>
    struct extract<void(X)> 
    { typedef X type; };

    typedef typename extract<func_t>::type type;
};

int main()
{
    create_pointer<void() const>::type p = 0;
}

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