Using unique_ptr to control a file descriptor

Question

In theory, I should be able to use a custom pointer type and deleter in order to have unique_ptr manage an object that is not a pointer. I tried the following c

Answer 1

Making Nicol Bolas class more general:

template
class Handle
    {
    public:
        Handle(T handle):m_handle(handle){}

        Handle(std::nullptr_t):m_handle(null_val){}

        operator T(){return m_handle;}

        bool operator==(const Handle& other) const
            {return other.m_handle==m_handle;}

    private:
        T m_handle;
    };

typedef Handle FileDescriptor;
typedef Handle GlResource; // according to http://stackoverflow.com/questions/7322147/what-is-the-range-of-opengl-texture-id
// ...

I am not sure if I should have default template parameter values or not.