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