packaged_task and thread

#include <iostream>
#include <future>
using namespace std;

int func(int m, int n) {
    return n*m;
}

int main() {
    std::packaged_task<int(int,int)> task(&func);
    auto f=task.get_future();
    std::thread t(std::move(task),3,11);
    t.join();
    std::cout<<f.get()<<std::endl;
}

/*
1>------ Build started: Project: ConsoleApplication7, Configuration: Debug Win32 ------
1>Build started 4/15/2012 11:14:47 PM.
1>InitializeBuildStatus:
1>  Touching "Debug\ConsoleApplication7.unsuccessfulbuild".
1>ClCompile:
1>  Source.cpp
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\functional(1140): error C2248: 'std::packaged_task<<unnamed-symbol>>::packaged_task' : cannot access private member declared in class 'std::packaged_task<<unnamed-symbol>>'
1>          with
1>          [
1>              <unnamed-symbol>=int (int,int)
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\future(1839) : see declaration of 'std::packaged_task<<unnamed-symbol>>::packaged_task'
1>          with
1>          [
1>              <unnamed-symbol>=int (int,int)
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\functional(1140) : while compiling class template member function 'std::_Bind<_Forced,_Ret,_Fun,_V0_t,_V1_t,_V2_t,_V3_t,_V4_t,_V5_t,<unnamed-symbol>>::_Bind(const std::_Bind<_Forced,_Ret,_Fun,_V0_t,_V1_t,_V2_t,_V3_t,_V4_t,_V5_t,<unnamed-symbol>> &)'
1>          with
1>          [
1>              _Forced=false,
1>              _Ret=void,
1>              _Fun=std::packaged_task<int (int,int)>,
1>              _V0_t=int,
1>              _V1_t=int,
1>              _V2_t=std::_Nil,
1>              _V3_t=std::_Nil,
1>              _V4_t=std::_Nil,
1>              _V5_t=std::_Nil,
1>              <unnamed-symbol>=std::_Nil
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\thread(50) : see reference to class template instantiation 'std::_Bind<_Forced,_Ret,_Fun,_V0_t,_V1_t,_V2_t,_V3_t,_V4_t,_V5_t,<unnamed-symbol>>' being compiled
1>          with
1>          [
1>              _Forced=false,
1>              _Ret=void,
1>              _Fun=std::packaged_task<int (int,int)>,
1>              _V0_t=int,
1>              _V1_t=int,
1>              _V2_t=std::_Nil,
1>              _V3_t=std::_Nil,
1>              _V4_t=std::_Nil,
1>              _V5_t=std::_Nil,
1>              <unnamed-symbol>=std::_Nil
1>          ]
1>          c:\users\petke\documents\visual studio 11\projects\consoleapplication7\consoleapplication7\source.cpp(12) : see reference to function template instantiation 'std::thread::thread<std::packaged_task<<unnamed-symbol>>,int,int>(_Fn,_V0_t &&,_V1_t &&)' being compiled
1>          with
1>          [
1>              <unnamed-symbol>=int (int,int),
1>              _Fn=std::packaged_task<int (int,int)>,
1>              _V0_t=int,
1>              _V1_t=int
1>          ]
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:01.64
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
*/