[Bug libstdc++/60564] New: [C++11] The std::packaged_task constructor taking a reference to a functor does not copy its argument.

[ralph.tandetzky at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60564

            Bug ID: 60564
           Summary: [C++11] The std::packaged_task constructor taking a
                    reference to a functor does not copy its argument.
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ralph.tandetzky at gmail dot com

The following code compiles successfully:

~~~~~~~~~~~~~~~~~~~~~
#include <future>
#include <iostream>

using namespace std;

struct Test
{
    Test()               { cout << "constructed." << endl; }
    Test( const Test & ) { cout << "copied."      << endl; }
    Test( Test && )      { cout << "moved."       << endl; }
    void operator()() const {}
};

int main()
{
    Test t;
    packaged_task<void()> pt1( t );
}
~~~~~~~~~~~~~~~~~~~~~

It produces the following output:

~~~~~~~~~~~~~~~~~~~~~
constructed.
moved.
~~~~~~~~~~~~~~~~~~~~~

However, the constructor of std::packaged_task<void()> should copy it's
argument into its internally stored task object according to 30.6.9.1 of the
C++11 standard (I'm referring to N3485, actually). 

Settings: I've used the online-compiler of http://en.cppreference.com/ with the
compiler GCC 4.8 (C++11). GCC 4.7 (C++11) does not have the bug, but produces a
correct output copying the object passed into the constructor.