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#include <functional>
 
void third_party(int n, std::function<void(int)> f)
{
  f(n);
}
 
struct foo
{
  template <typename... Args>
  void invoke(int n, Args&&... args)
  {
    auto bound = std::bind(&foo::invoke_impl<Args&...>, this,
                           std::placeholders::_1, std::forward<Args>(args)...);
 
    third_party(n, bound);
  }
 
  template <typename... Args>
  void invoke_impl(int, Args&&...)
  {
  }
};
 
int main()
{
    foo f;
    int c = 2;
    f.invoke(1, std::ref(c));
}

prog.cpp: In instantiation of ‘void foo::invoke(int, Args&& ...) [with Args = {std::reference_wrapper<int>}]’:
prog.cpp:29:28:   required from here
prog.cpp:16:25: error: could not convert ‘bound’ from ‘std::_Bind<std::_Mem_fn<void (foo::*)(int, std::reference_wrapper<int>&)>(foo*, std::_Placeholder<1>, std::reference_wrapper<int>)>’ to ‘std::function<void(int)>’
     third_party(n, bound);
                         ^

Standard output is empty