Re: [boost] [parameter] function types as named template parameters?

Subject: Re: [boost] [parameter] function types as named template parameters?
From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2009-01-23 13:13:42

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Friday 23 January 2009 12:39 pm, David Abrahams wrote:
> This can't really be minimal, can it?  Can you reduce it any further?

Ok, how about this version?
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFJegjY5vihyNWuA4URArnCAKCpuRX9RIfFumpxh5UKjzKaXST+rQCgyI6S
EabXtZi3zH4aW4wsYrdX8YM=
=msBh
-----END PGP SIGNATURE-----

--Boundary-00=_YjgeJGhSYqrDD6r
Content-Type: text/x-c++src; charset="iso-8859-1";
        name="parameter_function_type_test.cpp"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
        filename="parameter_function_type_test.cpp"

// Copyright Frank Mori Hess 2009.
// Distributed under the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#include <boost/parameter.hpp>

namespace boost
{
  namespace fake_signals2
  {
    namespace keywords
    {
      BOOST_PARAMETER_TEMPLATE_KEYWORD(signature_type)
    } // namespace keywords

    template <
        typename A0
      >
    class signal_type
    {
      typedef parameter::parameters<
          parameter::required<keywords::tag::signature_type>
        > parameter_spec;

    public:
      // ArgumentPack
      typedef typename
        parameter_spec::bind<A0>::type
        args;

      typedef typename parameter::binding<args, keywords::tag::signature_type>::type
        signature_type;
    };
  } // namespace fake_signals2
} // namespace boost

namespace bs2 = boost::fake_signals2;

int main(int, char*[])
{
  using namespace bs2::keywords;
  bs2::signal_type<signature_type<void ()> >::signature_type *mysig;
  return 0;
}

--Boundary-00=_YjgeJGhSYqrDD6r--