[Bug c++/47851] New: [4.6 Regression] [C++0x] Incorrect decltype result for conditional operator

[Bug c++/47851] New: [4.6 Regression] [C++0x] Incorrect decltype result for conditional operator

[mimomorin at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47851

           Summary: [4.6 Regression] [C++0x] Incorrect decltype result for
                    conditional operator
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mimomorin@gmail.com


Created attachment 23436
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23436
Test case

Suppose we have a code

    struct Type {};

    typedef Type const ConstType;

    struct ConvertibleToType {
        operator Type&() { return *reinterpret_cast<Type*>(this); }
    };

Then expression `true ? ConvertibleToType() : ConstType()` has type `Type`.
But `decltype(true ? ConvertibleToType() : ConstType())` is `Type const`.

Note that, in gcc 4.5, both the type of the expression and its `decltype` are
`Type`.
(In clang TOT, both are `Type const`.)

[Bug c++/47851] [4.6 Regression] [C++0x] Incorrect decltype result for conditional operator

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47851

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-02-22 18:04:47 UTC ---
Let's ask Jason to have a look.

[Bug c++/47851] [4.6 Regression] [C++0x] Incorrect decltype result for conditional operator

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47851

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-01 22:44:41 UTC ---
Author: jason
Date: Tue Mar  1 22:44:35 2011
New Revision: 170601

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=170601
Log:
    PR c++/47851
    * call.c (standard_conversion): Provide requested cv-quals on
    class rvalue conversion.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/decltype25.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/call.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/47851] [4.6 Regression] [C++0x] Incorrect decltype result for conditional operator

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47851

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-01 22:47:47 UTC ---
Fixed (so that both are Type const).

[Bug c++/47851] [4.6 Regression] [C++0x] Incorrect decltype result for conditional operator

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47851

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.6.0

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-03-01 23:28:45 UTC ---
Thanks!