Re: [Boost-users] Absolute Quanfusion : was Re: [fusion] transform a vector of values to refs

9 Sep 2006


      Andy Little wrote:
...
"Joel de Guzman"  wrote
...
Andy Little wrote:
...
...
Maybe it would be a useful example in the fusion docs?. Anyway here it is
FWIW:
Yes, definitely! I'll have to ask for documentation though. A simple
readme file is ok, plus, lots of comments.
OK. Bear in mind that its reliant 3 functors, multiply, add, and add-and-assign.
In order to be agnostic regarding type deduction schemes ( my own, phoenix,
lambda etc), my thought is to present particular versions of the functors
implemented using Boost.Typeof.
For the assignment one it needs to be implemented in terms of
boost::reference_wrapper anyway and with the Lvalue as the right hand argument,
which is AFAICS particular to the use of fold in fusion.
for example :
struct example_multiply{
template 
        struct result{
                typedef BOOST_TYPEOF_TPL(A() * B()) type;
        };
template 
        typename result::type
        operator(A const & a, B const & b)
        {
            return  a * b;
        }
};
Boost.Typeof will after all be in the next release alongside Boost.Fusion
Is that acceptable?
Sounds good. Okidoki.

Cheers,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net