Re: [Boost-users] multi-inheritance from elements of mpl::vector? ==> inherit_scattered ( for Barton & Nackmann trick)

From: David Abrahams (dave_at_[hidden])
Date: 2005-10-27 08:25:36

<Oliver.Kowalke_at_[hidden]> writes:

> no reply - so I found a solution by myself (used for the Barton &
> Nackmann trick)!
> template< typename D >
> struct F
> {
> 	std::string f()
> 	{ return static_cast< D & >( * this).str_; }
> };
>
> template< typename D >
> struct G
> {
> 	std::string g()
> 	{ return static_cast< D & >( * this).str_; }
> };

That's not the B&N trick; it's simple CRTP.
The B&N trick is the one where you stick a friend function that
applies to the derived class in the base class.  See the operators
library for reference.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com