381 lines
12 KiB
C++
381 lines
12 KiB
C++
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/*==============================================================================
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Copyright (c) 2001-2010 Joel de Guzman
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Copyright (c) 2004 Daniel Wallin
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Copyright (c) 2010 Thomas Heller
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Copyright (c) 2016 Kohei Takahashi
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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_LAMBDA_HPP
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#define BOOST_PHOENIX_SCOPE_LAMBDA_HPP
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#include <boost/phoenix/core/limits.hpp>
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#include <boost/fusion/include/transform.hpp>
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#include <boost/fusion/include/as_vector.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/phoenix/core/call.hpp>
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#include <boost/phoenix/core/expression.hpp>
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#include <boost/phoenix/core/meta_grammar.hpp>
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#include <boost/phoenix/scope/local_variable.hpp>
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#include <boost/phoenix/scope/scoped_environment.hpp>
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BOOST_PHOENIX_DEFINE_EXPRESSION(
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(boost)(phoenix)(lambda_actor)
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, (proto::terminal<proto::_>) // Locals
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(proto::terminal<proto::_>) // Map
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(meta_grammar) // Lambda
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)
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BOOST_PHOENIX_DEFINE_EXPRESSION(
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(boost)(phoenix)(lambda)
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, (proto::terminal<proto::_>) // OuterEnv
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(proto::terminal<proto::_>) // Locals
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(proto::terminal<proto::_>) // Map
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(meta_grammar) // Lambda
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)
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namespace boost { namespace phoenix
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{
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struct lambda_eval
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{
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BOOST_PROTO_CALLABLE()
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template <typename Sig>
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struct result;
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template <
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typename This
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, typename OuterEnv
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, typename Locals
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, typename Map
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, typename Lambda
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, typename Context
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>
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struct result<This(OuterEnv, Locals, Map, Lambda, Context)>
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{
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typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<
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OuterEnv
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>::type
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>::type
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outer_env_type;
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typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<
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Locals
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>::type
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>::type
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locals_type;
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typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<
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Map
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>::type
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>::type
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map_type;
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typedef
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typename proto::detail::uncvref<
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typename result_of::env<Context>::type
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>::type
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env_type;
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typedef
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typename result_of::eval<
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Lambda
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, typename result_of::context<
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scoped_environment<
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env_type
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, outer_env_type
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, locals_type
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, map_type
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>
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, typename result_of::actions<
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Context
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>::type
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>::type
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>::type
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type;
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};
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template <typename OuterEnv, typename Locals, typename Map, typename Lambda, typename Context>
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typename result<lambda_eval(OuterEnv const &, Locals const &, Map const &, Lambda const &, Context const &)>::type
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operator()(OuterEnv const & outer_env, Locals const & locals, Map const &, Lambda const & lambda, Context const & ctx) const
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{
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typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<
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OuterEnv
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>::type
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>::type
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outer_env_type;
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typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<
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Locals
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>::type
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>::type
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locals_type;
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typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<
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Map
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>::type
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>::type
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map_type;
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typedef
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typename proto::detail::uncvref<
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typename result_of::env<Context>::type
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>::type
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env_type;
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scoped_environment<
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env_type
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, outer_env_type
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, locals_type
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, map_type
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>
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env(phoenix::env(ctx), proto::value(outer_env), proto::value(locals));
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return eval(lambda, phoenix::context(env, phoenix::actions(ctx)));
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}
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};
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template <typename Dummy>
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struct default_actions::when<rule::lambda, Dummy>
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: call<lambda_eval, Dummy>
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{};
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template <typename Dummy>
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struct is_nullary::when<rule::lambda, Dummy>
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: proto::call<
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evaluator(
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proto::_child_c<3>
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, proto::call<
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functional::context(
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proto::make<
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mpl::true_()
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>
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, proto::make<
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detail::scope_is_nullary_actions()
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>
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)
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>
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, proto::make<
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proto::empty_env()
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>
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)
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>
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{};
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template <typename Dummy>
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struct is_nullary::when<rule::lambda_actor, Dummy>
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: proto::or_<
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proto::when<
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expression::lambda_actor<
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proto::terminal<vector0<> >
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, proto::terminal<proto::_>
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, meta_grammar
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>
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, mpl::true_()
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>
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, proto::when<
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expression::lambda_actor<
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proto::terminal<proto::_>
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, proto::terminal<proto::_>
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, meta_grammar
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>
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, proto::fold<
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proto::call<proto::_value(proto::_child_c<0>)>
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, proto::make<mpl::true_()>
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, proto::make<
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mpl::and_<
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proto::_state
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, proto::call<
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evaluator(
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proto::_
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, _context
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, proto::make<proto::empty_env()>
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)
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>
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>()
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>
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>
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>
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>
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{};
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struct lambda_actor_eval
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{
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template <typename Sig>
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struct result;
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template <typename This, typename Vars, typename Map, typename Lambda, typename Context>
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struct result<This(Vars, Map, Lambda, Context)>
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{
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typedef
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typename proto::detail::uncvref<
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typename result_of::env<Context>::type
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>::type
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env_type;
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typedef
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typename proto::detail::uncvref<
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typename result_of::actions<Context>::type
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>::type
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actions_type;
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typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<Vars>::type
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>::type
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vars_type;
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typedef typename
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detail::result_of::initialize_locals<
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vars_type
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, Context
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>::type
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locals_type;
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typedef
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typename expression::lambda<
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env_type
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, locals_type
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, Map
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, Lambda
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>::type const
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type;
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};
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template <
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typename Vars
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, typename Map
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, typename Lambda
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, typename Context
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>
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typename result<
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lambda_actor_eval(Vars const&, Map const &, Lambda const&, Context const &)
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>::type const
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operator()(Vars const& vars, Map const& map, Lambda const& lambda, Context const & ctx) const
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{
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typedef
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typename proto::detail::uncvref<
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typename result_of::env<Context>::type
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>::type
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env_type;
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/*typedef
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typename proto::detail::uncvref<
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typename result_of::actions<Context>::type
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>::type
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actions_type;*/
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typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<Vars>::type
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>::type
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vars_type;
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/*typedef
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typename proto::detail::uncvref<
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typename proto::result_of::value<Map>::type
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>::type
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map_type;*/
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typedef typename
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detail::result_of::initialize_locals<
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vars_type
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, Context
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>::type
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locals_type;
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locals_type locals = initialize_locals(proto::value(vars), ctx);
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return
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expression::
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lambda<env_type, locals_type, Map, Lambda>::
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make(phoenix::env(ctx), locals, map, lambda);
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}
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};
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template <typename Dummy>
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struct default_actions::when<rule::lambda_actor, Dummy>
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: call<lambda_actor_eval, Dummy>
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{};
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template <typename Locals = vector0<>,
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typename Map = detail::map_local_index_to_tuple<>,
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typename Dummy = void>
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struct lambda_actor_gen;
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template <>
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struct lambda_actor_gen<vector0<>, detail::map_local_index_to_tuple<>, void>
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{
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template <typename Expr>
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typename expression::lambda_actor<vector0<>, detail::map_local_index_to_tuple<>, Expr>::type const
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operator[](Expr const & expr) const
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{
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typedef vector0<> locals_type;
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typedef detail::map_local_index_to_tuple<> map_type;
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return expression::lambda_actor<locals_type, map_type, Expr>::make(locals_type(), map_type(), expr);
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}
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};
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template <typename Locals, typename Map>
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struct lambda_actor_gen<Locals, Map>
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{
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lambda_actor_gen(Locals const & locals_)
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: locals(locals_)
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{}
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lambda_actor_gen(lambda_actor_gen const & o)
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: locals(o.locals)
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{};
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template <typename Expr>
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typename expression::lambda_actor<
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Locals
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, Map
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, Expr
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>::type const
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operator[](Expr const & expr) const
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{
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return expression::lambda_actor<Locals, Map, Expr>::make(locals, Map(), expr);
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}
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Locals locals;
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};
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struct lambda_local_gen
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: lambda_actor_gen<>
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{
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#if defined(BOOST_PHOENIX_NO_VARIADIC_SCOPE)
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lambda_actor_gen<> const
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operator()() const
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{
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return lambda_actor_gen<>();
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}
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#include <boost/phoenix/scope/detail/cpp03/lambda.hpp>
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#else
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#define BOOST_PHOENIX_SCOPE_ACTOR_GEN_NAME lambda_actor_gen
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#define BOOST_PHOENIX_SCOPE_ACTOR_GEN_FUNCTION operator()
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#define BOOST_PHOENIX_SCOPE_ACTOR_GEN_CONST const
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#include <boost/phoenix/scope/detail/local_gen.hpp>
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#undef BOOST_PHOENIX_SCOPE_ACTOR_GEN_NAME
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#undef BOOST_PHOENIX_SCOPE_ACTOR_GEN_FUNCTION
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#undef BOOST_PHOENIX_SCOPE_ACTOR_GEN_CONST
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#endif
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};
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typedef lambda_local_gen lambda_type;
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lambda_local_gen const lambda = lambda_local_gen();
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}}
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#endif
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