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/*==============================================================================
Copyright (c) 2001-2010 Joel de Guzman
Copyright (c) 2004 Daniel Wallin
Copyright (c) 2010 Thomas Heller
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)
==============================================================================*/
#ifndef BOOST_PHOENIX_SCOPE_LET_HPP
#define BOOST_PHOENIX_SCOPE_LET_HPP
#include <boost/phoenix/core/limits.hpp>
#include <boost/fusion/include/transform.hpp>
#include <boost/fusion/include/as_vector.hpp>
#include <boost/phoenix/core/call.hpp>
#include <boost/phoenix/core/expression.hpp>
#include <boost/phoenix/core/meta_grammar.hpp>
#include <boost/phoenix/scope/scoped_environment.hpp>
#include <boost/phoenix/scope/local_variable.hpp>
#include <boost/phoenix/support/iterate.hpp>
#include <boost/phoenix/support/vector.hpp>
BOOST_PHOENIX_DEFINE_EXPRESSION(
(boost)(phoenix)(let_)
, (proto::terminal<proto::_>) // Locals
(proto::terminal<proto::_>) // Map
(meta_grammar)
)
namespace boost { namespace phoenix
{
struct let_eval
{
template <typename Sig>
struct result;
template <typename This, typename Vars, typename Map, typename Expr, typename Context>
struct result<This(Vars, Map, Expr, Context)>
{
typedef
typename proto::detail::uncvref<
typename result_of::env<Context>::type
>::type
env_type;
typedef
typename proto::detail::uncvref<
typename result_of::actions<Context>::type
>::type
actions_type;
typedef
typename proto::detail::uncvref<
typename proto::result_of::value<Vars>::type
>::type
vars_type;
typedef
typename proto::detail::uncvref<
typename proto::result_of::value<Map>::type
>::type
map_type;
typedef typename
detail::result_of::initialize_locals<
vars_type
, Context
>::type
locals_type;
typedef typename
result_of::eval<
Expr
, typename result_of::context<
scoped_environment<
env_type
, env_type
, locals_type
, map_type
>
, actions_type
>::type
>::type
type;
};
template <typename Vars, typename Map, typename Expr, typename Context>
typename result<let_eval(Vars const&, Map const&, Expr const &, Context const &)>::type const
operator()(Vars const & vars, Map, Expr const & expr, Context const & ctx) const
{
typedef
typename proto::detail::uncvref<
typename result_of::env<Context>::type
>::type
env_type;
typedef
typename proto::detail::uncvref<
typename proto::result_of::value<Vars>::type
>::type
vars_type;
typedef
typename proto::detail::uncvref<
typename proto::result_of::value<Map>::type
>::type
map_type;
typedef typename
detail::result_of::initialize_locals<
vars_type
, Context
>::type
locals_type;
locals_type locals = initialize_locals(proto::value(vars), ctx);
scoped_environment<
env_type
, env_type
, locals_type
, map_type
>
env(phoenix::env(ctx), phoenix::env(ctx), locals);
return eval(expr, phoenix::context(env, phoenix::actions(ctx)));
}
};
template <typename Dummy>
struct default_actions::when<rule::let_, Dummy>
: call<let_eval, Dummy>
{};
template <typename Locals, typename Map>
struct let_actor_gen
{
let_actor_gen(Locals const & locals)
: locals(locals)
{}
let_actor_gen(let_actor_gen const & o)
: locals(o.locals)
{}
template <typename Expr>
typename expression::let_<
Locals
, Map
, Expr
>::type const
operator[](Expr const & expr) const
{
return expression::let_<Locals, Map, Expr>::make(locals, Map(), expr);
}
Locals locals;
};
#define BOOST_PHOENIX_SCOPE_ACTOR_GEN_NAME let_actor_gen
#define BOOST_PHOENIX_SCOPE_ACTOR_GEN_FUNCTION let
#define BOOST_PHOENIX_SCOPE_ACTOR_GEN_CONST
#include <boost/phoenix/scope/detail/local_gen.hpp>
#undef BOOST_PHOENIX_SCOPE_ACTOR_GEN_NAME
#undef BOOST_PHOENIX_SCOPE_ACTOR_GEN_FUNCTION
#undef BOOST_PHOENIX_SCOPE_ACTOR_GEN_CONST
template <typename Dummy>
struct is_nullary::when<rule::let_, Dummy>
: proto::make<
mpl::and_<
proto::fold<
proto::call<proto::_value(proto::_child_c<0>)>
, proto::make<mpl::true_()>
, proto::make<
mpl::and_<
proto::_state
, proto::call<
evaluator(
proto::_
, _context
, proto::make<proto::empty_env()>
)
>
>()
>
>
, evaluator(
proto::_child_c<2>
, proto::call<
functional::context(
proto::make<
mpl::true_()
>
, proto::make<
detail::scope_is_nullary_actions()
>
)
>
, proto::make<
proto::empty_env()
>
)
>()
>
{};
}}
#endif
|
Swift