Pass a lamda expression in a thread pool - multithreading

Question

I try yo compile in C++11 the following piece of code without success. My goal is to use lambda expression instead of bind in order to fill a queue with tasks.
Could you please help me?
Is any case to create a dangling reference ?
#include <iostream>
#include <functional>
#include <queue>
using namespace std;
std::queue<std::function<void()>> funcs;
class A
{
public:
void foo(int a )
{
cout << "Hello word" << endl;
}
};
class ThePool
{
public:
template<typename _Callable, typename Object, typename... _Args>
void QueueFunction(_Callable __f, Object obj, _Args... __args)
{
funcs.push([=]()
{
(obj.*__f)((__args...));
});
}
void print(int i )
{
cout << "Hello Word"<< i <<endl;
}
};
int main(int argc, char** argv) {
ThePool t;
A a ;
t.QueueFunction(&A::foo,a,5);
std::function<void()> func = funcs.back();
func();
return 0;
}
The error that is generated is the following
main.cpp:24:38: error:
parameter packs not expanded with '...':
(obj.__f)((__args...));
^ main.cpp:24:38: note: '__args' main.cpp:24:44: error: expected ')' before '...' token
(obj.__f)((__args...));
^ main.cpp:24:49: error: expected ')' before ';' token
(obj.*__f)((__args...));
^ main.cpp: In function 'int main(int, char**)': main.cpp:39:45: error: conversion
from 'std::function' to non-scalar type
'std::function' requested
std::function func = funcs.back();
^ main.cpp: In instantiation of 'struct ThePool::QueueFunction(_Callable, Object,
_Args ...) [with _Callable = void (A::)(int); Object = A; _Args = {int}]::__lambda0': main.cpp:22:12: required from 'void
ThePool::QueueFunction(_Callable, Object, _Args ...) [with _Callable =
void (A::)(int); Object = A; _Args = {int}]' main.cpp:38:32:
required from here main.cpp:24:38: error: using invalid field
'ThePool::QueueFunction(_Callable, Object, _Args
...)::__lambda0::____args'
(obj.*__f)((__args...));