Re: [boost] Empty member optimization

From: John Maddock (john_at_[hidden])
Date: 2004-09-09 05:23:43

> I have written a small utility class to provide "empty member 
> optimization" for arbitrary types. The implementation makes use of the 
> empty base class optimization (EBCO) but avoids injection of the class. 
> A uniform and contained interface is exposed wether the optimization 
> applies or not:

> I believe this could be used as the basis for a compressed_tuple.
> 
> Here's a sample use:
> 
>    template <typename T0, typename T1>
>    struct A
>    : private compressed_member<T0>
>    , private compressed_member<T1, 1>
>    {
>        typedef compressed_member<T0> member0;
>        typedef compressed_member<T1, 1> member1;
> 
>        T0 const & first() { return base0::get(); }
>        T1 const & second() { return base1::get(); }
>    };

How does this differ from boost::compressed_pair ?

John.