[Bug libstdc++/48521] New: [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[Bug libstdc++/48521] New: [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

           Summary: [4.5/4.6/4.7 Regression] [C++0x] std::result_of
                    doesn't work with pointer to member
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: redi@gcc.gnu.org


This is supposed to work, and did with 4.4:

#include <functional>
struct X
{
  int foo();
};

typedef int (X::*pm)();
std::result_of<pm()>::type i = 0;

This means we don't accept std::async(X::foo, ...) which is defined in terms of
result_of

I think I intentionally removed support for pointers to members from result_of,
because an earlier C++0x draft said it shouldn't work

[Bug libstdc++/48521] [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.04.08 21:16:52
         AssignedTo|unassigned at gcc dot       |redi at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

[Bug libstdc++/48521] [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-09 10:55:02 UTC ---
(In reply to comment #0)
> This means we don't accept std::async(X::foo, ...)

Oops, meant to say std::async(&X::foo, ...)

[Bug libstdc++/48521] [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-16 19:53:27 UTC ---
I have a fix for this now, as well as a few issues in <functional> such as LWG
2017, 2021, missing deleted ref/cref overloads etc.

[Bug libstdc++/48521] [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-04-16 23:11:57 UTC ---
Excellent!

[Bug libstdc++/48521] [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-17 20:28:36 UTC ---
I'm just trying to figure out whether to enumerate every type of member
function w.r.t cv-qualifiers and ref-qualifiers and varargs as I think that's 8
partial specializations (24 when we get support for ref-qualifiers on member
functions!) some of which are missing for mem_fn/_Mem_fn (see my mails to the
reflector)

[Bug libstdc++/48521] [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-18 21:43:36 UTC ---
(In reply to comment #0)
> This is supposed to work, and did with 4.4:
> 
> #include <functional>
> struct X
> {
>   int foo();
> };
> 
> typedef int (X::*pm)();
> std::result_of<pm()>::type i = 0;

Bah, that shouldn't work! But this should:

std::result_of<pm(X)>::type i = 0;

[Bug libstdc++/48521] [4.5/4.6/4.7 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-19 13:26:15 UTC ---
Author: redi
Date: Tue Apr 19 13:26:08 2011
New Revision: 172709

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=172709
Log:
2011-04-19  Jonathan Wakely  <jwakely.gcc@gmail.com>

    PR libstdc++/48521
    * include/std/type_traits (result_of): Handle pointer to member.
    * include/std/functional (__invoke): Likewise.
    (_Function_to_function_pointer): Remove.
    (_Reference_wrapper_base): Provide nested types independent of
    unary_function and binary_function.
    (reference_wrapper::operator()): DR 2017.
    (ref(const A&&), cref(const A&&): Define as deleted.
    * include/std/future (async): Simplify SFINAE and use result_of to
    support pointer to member.
    * testsuite/20_util/reference_wrapper/invoke.cc: Test pointer to 
    member.
    * testsuite/20_util/reference_wrapper/24803.cc: Likewise.
    * testsuite/20_util/reference_wrapper/typedefs.cc: Test for types
    instead of derivation from unary_function and binary_function.
    * testsuite/20_util/declval/requirements/1_neg.cc: Adjust.
    * testsuite/20_util/reference_wrapper/invoke-2.cc: New.
    * testsuite/20_util/reference_wrapper/ref_neg.c: New.
    * testsuite/20_util/reference_wrapper/typedefs-3.c: New.

Added:
    trunk/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke-2.cc
    trunk/libstdc++-v3/testsuite/20_util/reference_wrapper/ref_neg.cc
    trunk/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/functional
    trunk/libstdc++-v3/include/std/future
    trunk/libstdc++-v3/include/std/type_traits
    trunk/libstdc++-v3/testsuite/20_util/declval/requirements/1_neg.cc
    trunk/libstdc++-v3/testsuite/20_util/reference_wrapper/24803.cc
    trunk/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke.cc
    trunk/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs.cc

[Bug libstdc++/48521] [4.5/4.6 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.7.0
   Target Milestone|---                         |4.6.1
            Summary|[4.5/4.6/4.7 Regression]    |[4.5/4.6 Regression]
                   |[C++0x] std::result_of      |[C++0x] std::result_of
                   |doesn't work with pointer   |doesn't work with pointer
                   |to member                   |to member

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-19 13:28:33 UTC ---
Fixed on trunk so far

[Bug libstdc++/48521] [4.5/4.6 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-23 17:51:34 UTC ---
Author: redi
Date: Sat Apr 23 17:51:31 2011
New Revision: 172901

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=172901
Log:
2011-04-23  Jonathan Wakely  <jwakely.gcc@gmail.com>

    PR libstdc++/48521
    * include/std/type_traits (result_of): Handle pointer to member.
    * include/std/functional (__invoke): Likewise.
    (_Function_to_function_pointer): Remove.
    (_Reference_wrapper_base): Provide nested types independent of
    unary_function and binary_function.
    (reference_wrapper::operator()): DR 2017.
    (ref(const A&&), cref(const A&&): Define as deleted.
    * include/std/future (async): Simplify SFINAE and use result_of to
    support pointer to member.
    * testsuite/20_util/reference_wrapper/invoke.cc: Test pointer to 
    member.
    * testsuite/20_util/reference_wrapper/24803.cc: Likewise.
    * testsuite/20_util/reference_wrapper/typedefs.cc: Test for types
    instead of derivation from unary_function and binary_function.
    * testsuite/20_util/reference_wrapper/invoke-2.cc: New.
    * testsuite/20_util/reference_wrapper/ref_neg.c: New.
    * testsuite/20_util/reference_wrapper/typedefs-3.c: New.


Added:
   
branches/gcc-4_6-branch/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke-2.cc
   
branches/gcc-4_6-branch/libstdc++-v3/testsuite/20_util/reference_wrapper/ref_neg.cc
   
branches/gcc-4_6-branch/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc
Modified:
    branches/gcc-4_6-branch/libstdc++-v3/ChangeLog
    branches/gcc-4_6-branch/libstdc++-v3/include/std/functional
    branches/gcc-4_6-branch/libstdc++-v3/include/std/future
    branches/gcc-4_6-branch/libstdc++-v3/include/std/type_traits
   
branches/gcc-4_6-branch/libstdc++-v3/testsuite/20_util/reference_wrapper/24803.cc
   
branches/gcc-4_6-branch/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke.cc
   
branches/gcc-4_6-branch/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs.cc

[Bug libstdc++/48521] [4.5 Regression] [C++0x] std::result_of doesn't work with pointer to member

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48521

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
      Known to work|                            |4.6.1
         Resolution|                            |FIXED
            Summary|[4.5/4.6 Regression]        |[4.5 Regression] [C++0x]
                   |[C++0x] std::result_of      |std::result_of doesn't work
                   |doesn't work with pointer   |with pointer to member
                   |to member                   |

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-23 17:54:45 UTC ---
fixed for 4.6.1

I don't plan to fix this on the 4.5 branch