TONGARI J <tongari95@gmail.com> writes:

>  template<typename Signature>
>  class library_function
>  {
>  public:
>      library_function(
>          shared_ptr<HMODULE> library, Signature* library_funtion)
>          :
>      m_library(library),
>      m_function(library_function)
>      {}
>
>      operator Signature*() const { return m_function; }
>
>
>  private:
>      shared_ptr<HMODULE> m_library;     Signature* m_function;
>  };Note: code not tested

This works well.  The key was `operator Signature*()`.  Clever idea,
thanks!

I didn't expect it to work because I though `boost::function` would pull
out the `Signature*` via the cooersion operator, and then the
`library_function` would be destroyed before the call was made.
However, this code proves that it has the desired behaviour, so it must
be keeping a copy of the `library_function` instance inside
`boost::function`: http://ideone.com/BZvuk9.

I didn't use`make_library_function` because inferring the signature
from the raw function isn't something I need.

If you would like to add this answer to the Stack Overflow qusetion,
I'll happily give you the brownie points :)