Chris@16: //  Copyright (c) 2001-2011 Hartmut Kaiser
Chris@16: // 
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See accompanying 
Chris@16: //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #if !defined(BOOST_SPIRIT_KARMA_PHOENIX_ATTRIBUTES_OCT_01_2009_1128AM)
Chris@16: #define BOOST_SPIRIT_KARMA_PHOENIX_ATTRIBUTES_OCT_01_2009_1128AM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/spirit/include/version.hpp>
Chris@16: 
Chris@16: // we support Phoenix attributes only starting with V2.2
Chris@16: #if SPIRIT_VERSION >= 0x2020
Chris@16: 
Chris@16: #include <boost/spirit/home/karma/detail/attributes.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/indirect_iterator.hpp>
Chris@16: #include <boost/spirit/home/support/container.hpp>
Chris@16: 
Chris@16: #include <boost/spirit/include/phoenix_core.hpp>
Chris@16: #include <boost/utility/result_of.hpp>
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: namespace boost { namespace spirit { namespace traits
Chris@16: {
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Provide customization points allowing the use of phoenix expressions as 
Chris@16:     // generator functions in the context of generators expecting a container 
Chris@16:     // attribute (Kleene, plus, list, repeat, etc.)
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Eval>
Chris@16:     struct is_container<phoenix::actor<Eval> const>
Chris@16:       : is_container<typename boost::result_of<phoenix::actor<Eval>()>::type>
Chris@16:     {};
Chris@16: 
Chris@16:     template <typename Eval>
Chris@16:     struct container_iterator<phoenix::actor<Eval> const>
Chris@16:     {
Chris@16:         typedef phoenix::actor<Eval> const& type;
Chris@16:     };
Chris@16: 
Chris@16:     template <typename Eval>
Chris@16:     struct begin_container<phoenix::actor<Eval> const>
Chris@16:     {
Chris@16:         typedef phoenix::actor<Eval> const& type;
Chris@16:         static type call(phoenix::actor<Eval> const& f)
Chris@16:         {
Chris@16:             return f;
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename Eval>
Chris@16:     struct end_container<phoenix::actor<Eval> const>
Chris@16:     {
Chris@16:         typedef phoenix::actor<Eval> const& type;
Chris@16:         static type call(phoenix::actor<Eval> const& f)
Chris@16:         {
Chris@16:             return f;
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename Eval>
Chris@16:     struct deref_iterator<phoenix::actor<Eval> const>
Chris@16:     {
Chris@16:         typedef typename boost::result_of<phoenix::actor<Eval>()>::type type;
Chris@16:         static type call(phoenix::actor<Eval> const& f)
Chris@16:         {
Chris@16:             return f();
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename Eval>
Chris@16:     struct next_iterator<phoenix::actor<Eval> const>
Chris@16:     {
Chris@16:         typedef phoenix::actor<Eval> const& type;
Chris@16:         static type call(phoenix::actor<Eval> const& f)
Chris@16:         {
Chris@16:             return f;
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename Eval>
Chris@16:     struct compare_iterators<phoenix::actor<Eval> const>
Chris@16:     {
Chris@16:         static bool 
Chris@16:         call(phoenix::actor<Eval> const&, phoenix::actor<Eval> const&)
Chris@16:         {
Chris@16:             return false;
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename Eval>
Chris@16:     struct container_value<phoenix::actor<Eval> >
Chris@16:     {
Chris@16:         typedef phoenix::actor<Eval> const& type;
Chris@16:     };
Chris@16: 
Chris@16:     template <typename Eval>
Chris@16:     struct make_indirect_iterator<phoenix::actor<Eval> const>
Chris@16:     {
Chris@16:         typedef phoenix::actor<Eval> const& type;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Handle Phoenix actors as attributes, just invoke the function object
Chris@16:     // and deal with the result as the attribute.
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Eval, typename Exposed>
Chris@16:     struct extract_from_attribute<phoenix::actor<Eval>, Exposed>
Chris@16:     {
Chris@16:         typedef typename boost::result_of<phoenix::actor<Eval>()>::type type;
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         static type call(phoenix::actor<Eval> const& f, Context& context)
Chris@16:         {
Chris@16:             return f(unused, context);
Chris@16:         }
Chris@16:     };
Chris@16: }}}
Chris@16: 
Chris@16: #endif
Chris@16: #endif