[Bug libstdc++/48472] New: some flavors of std::bind are included in the global namespace when you include <functional> with -std=c++0x

[Bug libstdc++/48472] New: some flavors of std::bind are included in the global namespace when you include <functional> with -std=c++0x

[blaise at suitabletech dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48472

           Summary: some flavors of std::bind are included in the global
                    namespace when you include <functional> with
                    -std=c++0x
           Product: gcc
           Version: 4.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: blaise@suitabletech.com


The following program compiles correctly. I believe it should not because bind
should not be in the global namespace. (If you take A out of std this program
fails as one would expect.)

-------------------------------------
// Compile with: g++ test.cpp -std=c++0x -c
#include <functional>

namespace std
{
class A
{};
}

void f(std::A a)
{
  bind(&f, a);
}
-------------------------------------

Output of g++ -v:
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.3-4ubuntu5'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-plugin --enable-objc-gc
--disable-werror --with-arch-32=i486 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)

[Bug libstdc++/48472] some flavors of std::bind are included in the global namespace when you include <functional> with -std=c++0x

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48472

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-04-05 21:22:03 UTC ---
No this is not in the global namespace but rather namelookup looks at std::bind
when one of the arguments are in std namespace.

namespace std
{
class A
{};
}

namespace std
{
  template<typename A>
  void g(void (*a)(A), A);
}

void h(std::A a)
{
  g(&h, a);
}

[Bug c++/48472] some flavors of std::bind are included in the global namespace when you include <functional> with -std=c++0x

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48472

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

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

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-05 22:08:21 UTC ---
right, this is Argument Dependent Lookup and is a feature of C++