Re: [Boost-users] [boost-users] Boost.Parameter: ArgumentPack - is type contained

At Tue, 29 Mar 2011 21:22:04 +0200, Christoph Heindl wrote:

Hi,

I'm trying to test an ArgumentPack for containment of a certain parameter. Since an ArgumentPack is a valid MPL Sequence, I think boost::mpl::contains should do the trick, but I fail to specify the correct type. Consider the following

BOOST_PARAMETER_NAME(color);

template<class Opts> void function_with_opts(const Opts &opts) { boost::mpl::contains<Opts, /* what type goes here if I'd like to test if color is present in Opts ? */ > )); }

try !boost::is_void< typename parameter::binding<Opts, tag::color, void>::type , void

::value

HTH -- Dave Abrahams BoostPro Computing http://www.boostpro.com