On Sun, Nov 6, 2011 at 8:52 PM, Robert Jones <robertgbjones@gmail.com> wrote:

The shared_ptr docs suggest that a smart pointer employing a null deleter can be
implemented using a functor. Why prefer a functor to a function?

Thanks Gents - The phrasing of my question was hopelessly lax: I appreciate in the

general case why one might choose to use a functor rather than a function as a callable

object, what I didn't grasp (and there may be nothing to grasp), was why this (from the

shared_ptr docs)

struct null_deleter

{

void operator()(void const *) const

{

}

};

Is implemented as a functor rather than a function. It's already void*, so I think no considerations

of static polymorphism or templating, and no state, but maybe there's something else I've not

thought of?

Thx

- Rob.