"Beman Dawes" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> At 04:18 PM 2/2/2003, David Abrahams wrote:
> >[...]
> >Why can't operator T*() and operator[](size_t) coexist?
>
> They are ambiguous, or at least GCC, Intel, and Microsoft compilers
> think so, although Borland only warns and Metrowerks accepts.
I see. That's what Comeau says too. I was testing it with an int
parameter, in which case it compiles.
> [...]
> The only way to get it to work with both VC++ 6.0 and 7.0 is to
> remove the operator T*().
Ok. I think this is possible without changing the inheritance hierarchy,
though. We can disable operator T* using the disallow_conversion
policy, and I suspect we can disable operator[] by tweaking the
argument type like so (pseudocode):
class smart_ptr
{
private:
class disable_index { };
typedef if_<
array_policy && disallow_conversion,
std::size_t,
disable_index const&
>::type index_arg;
// ...
public:
T& operator[](index_arg)
{ ... }
// ...
};
Dave
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