How to implement an easy_bind() that automagically inserts implied placeholders?

Question

I recently found this nifty snippet on the web - it allows you to bind without having to pass in explicit placeholders:

template 

        

Answer 1

This was troubling me a lot, since I had to bind a function in a situation when I did not know the arguments at the time. (A factory such as shown here How to implement serialization in C++)

For example (assume TSubClass::create is static)

template
class Factory
{
public:
    template
    void register(int id)
    {
         _map.insert(std::make_pair(id, std::bind(&TClass::create, /*how to give TArgs as placeholders??*/)));
    }
}

instead I was able to replace the std::bind with a lambda expression without having to use all these helper classes!

template
class Factory
{
public:
    template
    void register(int id)
    {
         _map.insert(std::make_pair(id, [](TArgs... args) { TSubClass::create(args...); }));
    }
}

as a bonus, you can also "bind" to constructors with this mechanism