From: "David Abrahams" <[EMAIL PROTECTED]>
>
> Here's what I think might be a correct implementation:
>
>      template <class T, class U> T implicit_cast(U const& x) { return x; }
>      template <class T, class U> T implicit_cast(U& x) { return x; }

The correct implementation IIRC is

template<class T> T implicit_cast(typename identity<T>::type x) { return
x; }

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