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From: David Abrahams (dave_at_[hidden])
Date: 2003-02-03 14:57:33

Beman Dawes <bdawes_at_[hidden]> writes:

> At 09:46 PM 2/2/2003, Howard Hinnant wrote:
> To me, a major benefit of a policy based design is to
> be able to accommodate a wide range of features,
> including those which find only limited use.
> If a policy based smart pointer can't accommodate a
> wide range of features, I start to wonder if the design
> itself is inflexible and flawed. That's why I worry a
> lot about whether a given PBSP design can handle
> apparently marginal uses.

There's no reason we have to be restricted to a single idiom AFAICT.
The GenVoca-style design we're using for the new iterator_adaptors is
great for adding new interface in the most-derived class. A blend of
techniques is often more effective than trying to cram everything into
a single approach. If you want a smart_ptr with implicit conversion,
one way might be:

  template <class T>
  struct legacy_ptr
    : smart_ptr<blah, blah, blah...>
    legacy_ptr(T* p) : smart_ptr<blah...>(p) {}
    T* operator()() const { return this->get(); }


                       David Abrahams
   dave_at_[hidden] *
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