Re: [boost] Array support [was SmartPtr (Loki) - auto_ptr/move c'torissue]

[Howard Hinnant]

On Sunday, February 2, 2003, at 03:48  PM, Beman Dawes wrote:

Here is the problem:

   If T is not an array, the interface must supply:

       T& operator*() const;
       T* operator->() const;

   If T is an array && conversion to T* is not desired, the
   interface must supply:

       T& operator[](size_t i) const;

   If conversion to T* is desired, the interface must supply:

       operator T*() const;

In other words, there are four interface combinations:

   When T is not an array && conversion to T* is not desired:

       T& operator*() const;
       T* operator->() const;

   When T is not an array && conversion to T* is desired:

       T& operator*() const;
       T* operator->() const;
       operator T*() const;

   When T is an array && conversion to T* is not desired:

       T& operator[](size_t i) const;

   When T is an array && conversion to T* is desired:

       operator T*() const;

Could someone review the motivations for wanting an implicit conversion to T* ? I'm failing to come up with any myself.

Thanks,
-Howard

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