[Bug libstdc++/56193] New: ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[Bug libstdc++/56193] New: ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[3dw4rd at verizon dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

             Bug #: 56193
           Summary: ios_base should replace operator void* with explicit
                    operator bool in C++11 onwards.
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: 3dw4rd@verizon.net


As pointed out on SO, g++ still compiles:

std::cout << std::cout

In C++11 the stream testing operator was changed from:
  operator void*() const;
to:
  explicit operator bool() const;

A quick patch is being tested now.
The target is 4.9 even though it is simple.

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-02-03
   Target Milestone|---                         |4.9.0
     Ever Confirmed|0                           |1

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[3dw4rd at verizon dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

--- Comment #1 from Ed Smith-Rowland <3dw4rd at verizon dot net> 2013-02-03 17:40:16 UTC ---
Created attachment 29343
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29343
Patch including testcase.

Here is a small patch.  I'm not ure the bast place to put the testcase.

Testing is underway.

The change builds and fails to compile the testcase as expected on
x86_64-unknown-linux.

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|4.9.0                       |4.8.0

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-02-07 15:13:27 UTC ---
Fixed by http://gcc.gnu.org/ml/gcc-cvs/2013-02/msg00222.html

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[paolo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

--- Comment #3 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> 2013-02-11 10:30:50 UTC ---
Author: paolo
Date: Mon Feb 11 10:30:43 2013
New Revision: 195939

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195939
Log:
2013-02-11  Paolo Carlini  <paolo.carlini@oracle.com>

    PR libstdc++/56282
    Revert:
    2013-02-06  Edward Smith-Rowland  <3dw4rd@verizon.net>

    PR libstdc++/56193
    * include/bits/basic_ios.h: Replace operator void*() const
    with explicit operator bool() const in C++11 and greater.
    * testsuite/27_io/basic_ios/pr56193.cc: New file.

Removed:
    trunk/libstdc++-v3/testsuite/27_io/basic_ios/pr56193.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/basic_ios.h

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

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

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

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-02-11 10:32:25 UTC ---
Patch reverted. Better simply do this in the next ABI.

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |4.8.0
   Target Milestone|4.8.0                       |---

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-02-11 11:22:53 UTC ---
PR 56282 has a patch that could serve as a starting point for the symbol
versions file

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

--- Comment #6 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-02-11 11:48:54 UTC ---
Indeed, thanks Jon.

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[david.abdurachmanov at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

David Abdurachmanov <david.abdurachmanov at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |david.abdurachmanov at gmail dot c
                   |                            |om

--- Comment #7 from David Abdurachmanov <david.abdurachmanov at gmail dot com> ---
Ping.

@Paolo, any ETA for this entering a trunk?

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[daniel.kruegler at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel.kruegler@googlemail.
                   |                            |com

--- Comment #8 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
ping 2014.

I just noticed the same problem that in C++11 code (and beyond) the following
code compiles due to the existence of the implicit conversion to void*:

#include <iostream>

bool test = (std::cout == std::cerr);
>From gcc-bugs-return-454975-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jun 26 06:15:07 2014
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Subject: [Bug libstdc++/61582] C++11 regex memory corruption
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida582

--- Comment #7 from Tim Shen <timshen at gcc dot gnu.org> ---
"(.*{100}{100}{100})" seems to be a stack overflow. It's because regex executor
uses recursion. It could be fixed (not segfault but memory exhaustion) by using
a std::stack and simulate recursion; IMH, however, directly throwing
regex_error::error_space is the right thing here to do.

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It will be ready when it's ready - there are bigger issues that are higher
priority

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[daniel.kruegler at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

--- Comment #10 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
(In reply to Jonathan Wakely from comment #9)
Yes, sure.
>From gcc-bugs-return-454994-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jun 26 09:18:36 2014
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From: "piotr5 at netscape dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/61617] New: add boost::coroutine
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida617

            Bug ID: 61617
           Summary: add boost::coroutine
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: piotr5 at netscape dot net

this has been suggested for addition in the next standard. it is an important
element of c++ because iterator-code can become quite incomprehensible
otherwise. but the main reason I'd like to see it as part of gcc is so that
programmers responsible for optimizations could start thinking up ways to
implement coroutines on the various platforms in creative ways. no need to wait
with optimization-ideas for the standard to include it, when it's already being
used in other programming languages. but if it isn't being used in c++ it
likely wont get much attention...

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |5.0

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Sep 24 22:13:35 2014
New Revision: 215571

URL: https://gcc.gnu.org/viewcvs?rev=215571&root=gcc&view=rev
Log:
    PR libstdc++/56193
    * config/abi/pre/gnu.ver: Add new exports.
    * include/bits/basic_ios.h (basic_ios::operator bool): Define.
    * src/c++98/ios_locale.cc (basic_ios::operator void*): Instantiate.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/config/abi/pre/gnu.ver
    trunk/libstdc++-v3/include/bits/basic_ios.h
    trunk/libstdc++-v3/src/c++98/ios_locale.cc

[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

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

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

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed.