capture member variable by value

How would I catch a member variable by value when using C++11 lambda expressions?

Using the [my_member] syntax doesn't seem to work, and implicit capture uses the this pointer. What is need is a way to explicitly specify capture type of member variables. Is that possible?

My workaround for now is:

void member_function()
{
    std::shared_ptr<my_member_class> my_member_copy = my_member; // this shouldn't be necessary
    std::async([=]{ std::cout << *my_member_copy; });
    // std::async([=]{ std::cout << *my_member_; }); // wrong, my member could be potentially out of scope
}