[Bug c++/51210] New: [C++11][DR 547] std::type_info works incorrectly with function types with cv-qualifier-seq

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51210

             Bug #: 51210
           Summary: [C++11][DR 547] std::type_info works incorrectly with
                    function types with cv-qualifier-seq
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: daniel.krueg...@googlemail.com
                CC: ja...@gcc.gnu.org


gcc 4.7 20111112 (experimental) in C++11 mode outputs 

1

in the following program:

//---------------
#include <iostream>
#include <typeinfo>

typedef void FC() const;

int main() {
 std::cout << (typeid(void()) == typeid(FC)) << std::endl;
}
//---------------

As of C++11 it has been clarified that FC still contains the information of a
function that has a const qualifier. There is no evidence from 5.2.8 that says
that

void() const

and

void()

should give std::type_info objects that evaluate to equal.

The program should output

0

instead.

In regard to the upcoming implementation for functions with ref-qualifier the
same constraints should hold, i.e.

//---------------
#include <iostream>
#include <typeinfo>

typedef void FLR() &;
typedef void FRR() &&;

int main() {
 std::cout << (typeid(void()) == typeid(FLR)) << std::endl;
 std::cout << (typeid(void()) == typeid(FRR)) << std::endl;
}
//---------------

should output:

0
0