Re: [boost] Additions to utility.hpp?

From: David Abrahams (abrahams_at_[hidden])
Date: 2000-07-08 00:04:08

----- Original Message -----
From: "Daryle Walker" <darylew_at_[hidden]>

> I have suggestions to add classes to "utility.hpp."  They are like the
> noncopyable class, except they are for the other automatic operators
> (address and comma).
>
> 1.  unaddressable
>     + blocks (unary) &
>     + has private declarations (within a class/struct) of
>         T* operator&();
>         T const * operator&() const;
>
> 2.  default_inoperable
>     + blocks = & ,
>     + has private declarations (within a class/struct) of
>         T& operator=( const T& );
>         T* operator&();
>         T const * operator&() const;
>         T operator,( const T& ) const;
>         template <typename U>
>             U operator,( const U& ) const;
>
> I don't know whether or not both forms of operators , or & are needed.  I
> guess their (default) constructor and destructor would be protected and
> inline and be defined to do nothing, like in noncopyable.

Interesting, but are they useful?
It's easy to write a class whose default construction or copy-assignment
semantics don't work right, but operator, and operator& pretty much always
do the right thing. Do you have a motivating example for these?

-Dave