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/*=============================================================================
Copyright (c) 2001-2007 Joel de Guzman
Copyright (c) 2004 Daniel Wallin
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 PHOENIX_SCOPE_LET_HPP
#define PHOENIX_SCOPE_LET_HPP
#include <boost/spirit/home/phoenix/core/limits.hpp>
#include <boost/spirit/home/phoenix/core/composite.hpp>
#include <boost/spirit/home/phoenix/scope/scoped_environment.hpp>
#include <boost/spirit/home/phoenix/scope/detail/local_variable.hpp>
#include <boost/spirit/home/phoenix/detail/local_reference.hpp>
#include <boost/spirit/home/phoenix/core/actor.hpp>
#include <boost/fusion/include/transform.hpp>
#include <boost/fusion/include/as_vector.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/bool.hpp>
namespace boost { namespace phoenix
{
template <typename Base, typename Vars, typename Map>
struct let_actor : Base
{
typedef typename
mpl::fold<
Vars
, mpl::false_
, detail::compute_no_nullary
>::type
no_nullary;
template <typename Env>
struct result
{
typedef typename
fusion::result_of::as_vector<
typename fusion::result_of::transform<
Vars
, detail::initialize_local<Env>
>::type
>::type
locals_type;
typedef typename Base::template
result<scoped_environment<Env, Env, locals_type, Map> >::type
result_type;
typedef typename
detail::unwrap_local_reference<result_type>::type
type;
};
let_actor(Base const& base, Vars const& vars)
: Base(base), vars(vars) {}
template <typename Env>
typename result<Env>::type
eval(Env const& env) const
{
typedef typename
fusion::result_of::as_vector<
typename fusion::result_of::transform<
Vars
, detail::initialize_local<Env>
>::type
>::type
locals_type;
locals_type locals =
fusion::as_vector(
fusion::transform(
vars
, detail::initialize_local<Env>(env)));
typedef typename result<Env>::type RT;
return RT(Base::eval(
scoped_environment<Env, Env, locals_type, Map>(
env
, env
, locals)));
}
Vars vars;
};
template <typename Vars, typename Map>
struct let_actor_gen
{
template <typename Base>
actor<let_actor<Base, Vars, Map> > const
operator[](actor<Base> const& base) const
{
return let_actor<Base, Vars, Map>(base, vars);
}
let_actor_gen(Vars const& vars)
: vars(vars) {}
Vars vars;
};
template <typename Key>
struct local_variable; // forward
struct assign_eval; // forward
struct let_gen
{
template <typename K0, typename V0>
let_actor_gen<
fusion::vector<V0>
, detail::map_local_index_to_tuple<K0>
>
operator()(
actor<composite<assign_eval, fusion::vector<local_variable<K0>, V0> > > const& a0
) const
{
return fusion::vector<V0>(fusion::at_c<1>(a0));
}
template <typename K0, typename K1, typename V0, typename V1>
let_actor_gen<
fusion::vector<V0, V1>
, detail::map_local_index_to_tuple<K0, K1>
>
operator()(
actor<composite<assign_eval, fusion::vector<local_variable<K0>, V0> > > const& a0
, actor<composite<assign_eval, fusion::vector<local_variable<K1>, V1> > > const& a1
) const
{
return fusion::vector<V0, V1>(fusion::at_c<1>(a0), fusion::at_c<1>(a1));
}
// Bring in the rest...
#define PHOENIX_LOCAL_GEN_NAME let_actor_gen
#include <boost/spirit/home/phoenix/scope/detail/local_gen.hpp>
#undef PHOENIX_LOCAL_GEN_NAME
};
let_gen const let = let_gen();
}}
#endif
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Swift