[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[poletti.marco at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

poletti.marco at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |poletti.marco at gmail dot
                   |                            |com

--- Comment #4 from poletti.marco at gmail dot com 2012-09-17 17:53:36 UTC ---
Still an issue with GCC 4.7.1.
Clang does not have this issue.

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[poletti.marco at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

--- Comment #5 from poletti.marco at gmail dot com 2012-09-17 17:55:54 UTC ---
Still an issue with GCC 4.7.1.
Clang does not have this issue.

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[poletti.marco at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

--- Comment #6 from poletti.marco at gmail dot com 2012-09-17 17:57:58 UTC ---
Still an issue with GCC 4.7.1.
Clang does not have this issue.

Yet another example:


struct C {
    void operator[](C) {
    }
};

void f() {
    C x;
    (C()[x]);
}

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|gcc-bugs at gcc dot gnu.org        |
           Assignee|unassigned at gcc dot gnu.org      |paolo.carlini at oracle dot com
      Known to fail|                            |

--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Looking into it.

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Tentative patch here: http://gcc.gnu.org/ml/gcc-patches/2013-10/msg02536.html

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[paolo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

--- Comment #9 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Sat Nov  2 09:34:13 2013
New Revision: 204312

URL: http://gcc.gnu.org/viewcvs?rev=204312&root=gcc&view=rev
Log:
/cp
2013-11-02  Paolo Carlini  <paolo.carlini@oracle.com>

    PR c++/29234
    PR c++/56037
    * parser.c (cp_parser_cast_expression): If we aren't looking at
    a cast-expression don't call cp_parser_type_id.
    (cp_parser_postfix_expression): Likewise for compound-literal.
    (cp_parser_tokens_start_cast_expression): Adjust.

/testsuite
2013-11-02  Paolo Carlini  <paolo.carlini@oracle.com>

    PR c++/29234
    PR c++/56037
    * g++.dg/parse/pr29234.C: New.
    * g++.dg/parse/pr56037.C: Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/parse/pr29234.C
    trunk/gcc/testsuite/g++.dg/parse/pr56037.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/parser.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

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

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

--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed for 4.9.0.

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |niels at penneman dot org

--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> ---
*** Bug 55535 has been marked as a duplicate of this bug. ***

[Bug c++/29234] New: Cannot put temporary member functor calls inside brackets

[lloyd dot reed at vistec-semi dot com]

Putting calls of temporary member functors in brackets causes an error, "error:
`type name' declared as function returning a function". 


The following code:

struct S
{
    struct Member_functor
    {
        void operator () ()
        {
        }
    };
};

int main( int argc, char* argv[] )
{
    S::Member_functor()(); // OK
    ( S::Member_functor()() ); // error: `type name' declared as function
returning a function

    return 0;
}


produces this error using Cygwin gcc 3.4.4 on a WindowsXP Pro sp2 PC:

J:\>g++ -o gcc_test2.exe gcc_test2.cpp -Wall -save-temps -v
Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs
Configured with: /gcc/gcc-3.4.4/gcc-3.4.4-1/configure --verbose --prefix=/usr
--exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib
--mandir=/usr/share/man --infodir=/usr/share/info
--enable-languages=c,ada,c++,d,f77,java,objc --enable-nls
--without-included-gettext --enable-version-specific-runtime-libs --without-x
--enable-libgcj --disable-java-awt --with-system-zlib --enable-interpreter
--disable-libgcj-debug --enable-threads=posix --enable-java-gc=boehm
--disable-win32-registry --enable-sjlj-exceptions --enable-hash-synchronization
--enable-libstdcxx-debug : (reconfigured)
Thread model: posix
gcc version 3.4.4 (cygming special) (gdc 0.12, using dmd 0.125)
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/cc1plus.exe -E -quiet -v -D__CYGWIN32__
-D__CYGWIN__ -Dunix -D__unix__ -D__unix -idirafter
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api -idirafter
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/lib/../../include/w32api
gcc_test2.cpp -mtune=pentiumpro -Wall -o gcc_test2.ii
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/include"
ignoring duplicate directory
"/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/lib/../../include/w32api"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/i686-pc-cygwin
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/backward
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/include
 /usr/include
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api
End of search list.
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/cc1plus.exe -fpreprocessed gcc_test2.ii
-quiet -dumpbase gcc_test2.cpp -mtune=pentiumpro -auxbase gcc_test2 -Wall
-version -o gcc_test2.s
GNU C++ version 3.4.4 (cygming special) (gdc 0.12, using dmd 0.125)
(i686-pc-cygwin)
        compiled by GNU C version 3.4.4 (cygming special) (gdc 0.12, using dmd
0.125).
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
gcc_test2.cpp: In function `int main(int, char**)':
gcc_test2.cpp:14: error: `type name' declared as function returning a function
gcc_test2.cpp:14: error: `type name' declared as function returning a function


The same applies to functors returning values. 


The contents of the preprocessed file is given below:

# 1 "gcc_test2.cpp"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "gcc_test2.cpp"
struct S
{
    struct Member_functor
    {
        void operator () ()
        {
        }
    };
};

int main( int argc, char* argv[] )
{
    S::Member_functor()();
    ( S::Member_functor()() );

    return 0;
}


-- 
           Summary: Cannot put temporary member functor calls inside
                    brackets
           Product: gcc
           Version: 3.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: lloyd dot reed at vistec-semi dot com
  GCC host triplet: i686-pc-cygwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[bangerth at dealii dot org]

------- Comment #1 from bangerth at dealii dot org  2006-10-10 03:51 -------
Confirmed:
------------------
struct S { void operator () (); };

void foo ()
{
  ( S()() );
}
------------------

g/x> /home/bangerth/bin/gcc-4.2-pre/bin/c++ -c x.cc
x.cc: In function ‘void foo()’:
x.cc:5: error: ‘type name’ declared as function returning a
function
x.cc:5: error: ‘type name’ declared as function returning a
function

The error message also isn't particularly enlightening, and is duplicated
on top of that.

I think what is happening is that we parse the expression as the beginning
of a C-style cast to type
  S (*) ()
but when we don't find an argument for the cast, we should backtrack.

W.


-- 

bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bangerth at dealii dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |rejects-valid
           Priority|P3                          |P2
   Last reconfirmed|0000-00-00 00:00:00         |2006-10-10 03:51:44
               date|                            |
            Summary|Cannot put temporary member |Call to operator() of
                   |functor calls inside        |temporary object wrongly
                   |brackets                    |parsed


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[lidaobing at gmail dot com]

------- Comment #2 from lidaobing at gmail dot com  2007-02-07 05:13 -------
*** Bug 30725 has been marked as a duplicate of this bug. ***


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234

[Bug c++/29234] Call to operator() of temporary object wrongly parsed

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2009-11-13 21:07 -------
*** Bug 42034 has been marked as a duplicate of this bug. ***


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sc09q4 at bullseye dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29234