Re: [Boost-users] [phoenix][units] make boost.phoenix play well with boost.units

Subject: Re: [Boost-users] [phoenix][units] make boost.phoenix play well with boost.units
From: alfC (alfredo.correa_at_[hidden])
Date: 2010-06-03 22:31:14

On Jun 3, 7:16 pm, Steven Watanabe <watanab..._at_[hidden]> wrote:
> Joel de Guzman wrote:
> > When you do a*a with quantity<si::length>, what is the expected
> > return type?
>
> quantity<si::area>
rigth.

and in case you wonder, Boost.Units has a bunch of template functions
to obtain
the result type of arithmetic operations. For example
boost::units::multiply_typeof_helper<X,Y>::type,
these are heavily used in boost/units/lambda.hpp, which makes lambda
play well with units.

>
> > (looks like a phoenix-2 limitation. hopefully, this will all get sorted
> > out with phoenix-3).

so, there is no hope with phoenix-2?
can't we do something temporary like boost/units/lambda.hpp to help
phoenix-2 to
deduce the type? is it possible?

Thank you,
Alfredo