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Date: Wed, 26 Mar 2003 12:00:47 -0500
From: Hyman Rosen <hyrosen@mail.com>
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Subject: Re: Imitation is the sincerest form of flattery
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Date: 2003-03-26T12:00:47-05:00
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Dmitry A. Kazakov wrote:
> It is no more a normal subroutine taking Element a parameter.

Oh, sorry - I thought we were passing the array around.
Anyway, in C++ you just need to have a conversion to
reference to element type in the proxy class.

template <typename Element>
struct funky_array
{
     struct index_proxy
     {
         funky_array &a;
         int i;
         index_proxy(funky_array &a, int i) : a(a), i(i) { }
         operator Element &() { return a.get_element(i); }
     };
     Element &get_element(int i) { /* find and return the element */ }
     index_proxy operator[](int i) { return index_proxy(*this, i); }
};