179 lines
7.3 KiB
C++
179 lines
7.3 KiB
C++
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/*==============================================================================
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Copyright (c) 2005-2010 Joel de Guzman
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Copyright (c) 2010 Thomas Heller
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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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==============================================================================*/
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#ifndef BOOST_PHOENIX_SCOPE_SCOPED_ENVIRONMENT_HPP
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#define BOOST_PHOENIX_SCOPE_SCOPED_ENVIRONMENT_HPP
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#include <boost/phoenix/core/limits.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/fusion/sequence/sequence_facade.hpp>
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
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#include <boost/fusion/sequence/intrinsic/end.hpp>
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#include <boost/fusion/sequence/intrinsic/size.hpp>
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#include <boost/fusion/sequence/intrinsic/value_at.hpp>
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#include <boost/fusion/sequence/intrinsic/at.hpp>
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#include <boost/fusion/support/category_of.hpp>
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#include <boost/fusion/include/pop_front.hpp>
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#include <boost/utility/result_of.hpp>
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namespace boost { namespace phoenix
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{
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template<typename Env, typename OuterEnv, typename Locals, typename Map>
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struct scoped_environment
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: fusion::sequence_facade<
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scoped_environment<Env, OuterEnv, Locals, Map>
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, fusion::random_access_traversal_tag
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>
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{
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typedef Env env_type;
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typedef OuterEnv outer_env_type;
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typedef Locals locals_type;
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typedef Map map_type;
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scoped_environment(
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Env const & env_
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, OuterEnv const &outer_env_
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, Locals const &locals_
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)
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: env(env_)
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, outer_env(outer_env_)
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, locals(locals_)
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{}
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scoped_environment(scoped_environment const & o)
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: env(o.env)
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, outer_env(o.outer_env)
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, locals(o.locals)
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{}
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Env const & env;
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OuterEnv const & outer_env;
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Locals const & locals;
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typedef typename
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fusion::result_of::pop_front<
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typename add_const<
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typename proto::detail::uncvref<Env>::type
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>::type
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>::type
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args_type;
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args_type args() const
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{
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return fusion::pop_front(env);
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}
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#define BOOST_PHOENIX_ADAPT_SCOPED_ENVIRONMENT(INTRINSIC) \
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template <typename Seq> \
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struct INTRINSIC \
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{ \
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typedef \
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typename fusion::result_of::INTRINSIC< \
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typename mpl::eval_if_c< \
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is_const< \
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typename remove_reference< \
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typename Seq::env_type \
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>::type \
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>::value \
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, add_const< \
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typename proto::detail::uncvref< \
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typename Seq::env_type \
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>::type \
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> \
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, proto::detail::uncvref< \
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typename Seq::env_type \
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> \
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>::type \
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>::type \
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type; \
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\
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static type call(Seq & seq) \
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{ \
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return fusion::INTRINSIC(seq.env); \
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} \
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} \
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/**/
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BOOST_PHOENIX_ADAPT_SCOPED_ENVIRONMENT(begin);
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BOOST_PHOENIX_ADAPT_SCOPED_ENVIRONMENT(end);
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BOOST_PHOENIX_ADAPT_SCOPED_ENVIRONMENT(size);
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#undef BOOST_PHOENIX_ADAPT_SCOPED_ENVIRONMENT
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template <typename Seq, typename N>
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struct value_at
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{
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typedef
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typename fusion::result_of::value_at<
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typename mpl::eval_if_c<
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is_const<
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typename remove_reference<
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typename Seq::env_type
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>::type
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>::value
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, add_const<
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typename proto::detail::uncvref<
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typename Seq::env_type
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>::type
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>
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, proto::detail::uncvref<
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typename Seq::env_type
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>
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>::type
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, N
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>::type
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type;
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};
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template <typename Seq, typename N>
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struct at
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{
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typedef
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typename fusion::result_of::at<
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typename mpl::eval_if_c<
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is_const<
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typename remove_reference<
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typename Seq::env_type
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>::type
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>::value
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, add_const<
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typename proto::detail::uncvref<
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typename Seq::env_type
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>::type
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>
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, proto::detail::uncvref<
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typename Seq::env_type
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>
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>::type
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, N
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>::type
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type;
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static type call(Seq & seq)
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{
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return fusion::at<N>(seq.env);
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}
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};
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};
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template <typename Env, typename Dummy = void>
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struct is_scoped_environment : mpl::false_ {};
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template <typename Env>
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struct is_scoped_environment<Env&> : is_scoped_environment<Env> {};
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template <typename Env, typename OuterEnv, typename Locals, typename Map>
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struct is_scoped_environment<scoped_environment<Env, OuterEnv, Locals, Map> >
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: mpl::true_
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{};
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template <typename Env, typename OuterEnv, typename Locals, typename Map>
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struct is_scoped_environment<scoped_environment<Env, OuterEnv, Locals, Map> const>
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: mpl::true_
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{};
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}}
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#endif
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