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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_DETAIL_LOCAL_VARIABLE_HPP
#define PHOENIX_SCOPE_DETAIL_LOCAL_VARIABLE_HPP
#include <boost/mpl/int.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/equal_to.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/less.hpp>
#include <boost/mpl/size.hpp>
#include <boost/fusion/include/at.hpp>
#include <boost/fusion/include/value_at.hpp>
#include <boost/preprocessor/enum.hpp>
#include <boost/preprocessor/repeat.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/is_reference.hpp>
#define PHOENIX_MAP_LOCAL_TEMPLATE_PARAM(z, n, data) \
typename T##n = unused<n>
#define PHOENIX_MAP_LOCAL_DISPATCH(z, n, data) \
typedef char(&result##n)[n+2]; \
static result##n get(T##n*);
namespace boost { namespace phoenix
{
template <typename Env, typename OuterEnv, typename Locals, typename Map>
struct scoped_environment;
namespace detail
{
template <typename Env>
struct initialize_local
{
template <class F>
struct result;
template <class F, class Actor>
struct result<F(Actor)>
{
typedef typename remove_reference<Actor>::type actor_type;
typedef typename actor_type::template result<Env>::type type;
};
initialize_local(Env const& env)
: env(env) {}
template <typename Actor>
typename result<initialize_local(Actor)>::type
operator()(Actor const& actor) const
{
return actor.eval(env);
}
Env const& env;
private:
// silence MSVC warning C4512: assignment operator could not be generated
initialize_local& operator= (initialize_local const&);
};
template <typename T>
struct is_scoped_environment : mpl::false_ {};
template <typename Env, typename OuterEnv, typename Locals, typename Map>
struct is_scoped_environment<scoped_environment<Env, OuterEnv, Locals, Map> >
: mpl::true_ {};
template <int N>
struct unused;
template <BOOST_PP_ENUM(
PHOENIX_LOCAL_LIMIT, PHOENIX_MAP_LOCAL_TEMPLATE_PARAM, _)>
struct map_local_index_to_tuple
{
typedef char(¬_found)[1];
static not_found get(...);
BOOST_PP_REPEAT(PHOENIX_LOCAL_LIMIT, PHOENIX_MAP_LOCAL_DISPATCH, _)
};
template<typename T>
T* generate_pointer();
template <typename Map, typename Tag>
struct get_index
{
BOOST_STATIC_CONSTANT(int,
value = (
static_cast<int>((sizeof(Map::get(generate_pointer<Tag>()))) / sizeof(char)) - 2
));
// if value == -1, Tag is not found
typedef mpl::int_<value> type;
};
template <typename Local, typename Env>
struct apply_local;
template <typename Local, typename Env>
struct outer_local
{
typedef typename
apply_local<Local, typename Env::outer_env_type>::type
type;
};
template <typename Locals, typename Index>
struct get_local_or_void
{
typedef typename
mpl::eval_if<
mpl::less<Index, mpl::size<Locals> >
, fusion::result_of::at<Locals, Index>
, mpl::identity<fusion::void_>
>::type
type;
};
template <typename Local, typename Env, typename Index>
struct get_local_from_index
{
typedef typename
mpl::eval_if<
mpl::equal_to<Index, mpl::int_<-1> >
, outer_local<Local, Env>
, get_local_or_void<typename Env::locals_type, Index>
>::type
type;
};
template <typename Local, typename Env>
struct get_local
{
typedef typename
get_index<
typename Env::map_type, typename Local::key_type>::type
index_type;
typedef typename
get_local_from_index<Local, Env, index_type>::type
type;
};
template <typename Local, typename Env>
struct apply_local
{
// $$$ TODO: static assert that Env is a scoped_environment $$$
typedef typename get_local<Local, Env>::type type;
};
template <typename Key>
struct eval_local
{
template <typename RT, typename Env, typename Index>
static RT
get(Env const& env, Index, mpl::false_)
{
return RT(fusion::at<Index>(env.locals));
}
template <typename RT, typename Env, typename Index>
static RT
get(Env const& env, Index index, mpl::true_)
{
typedef typename
get_index<typename Env::outer_env_type::map_type, Key>::type
index_type;
return get<RT>(
env.outer_env
, index_type()
, mpl::equal_to<index_type, mpl::int_<-1> >());
}
template <typename RT, typename Env, typename Index>
static RT
get(Env const& env, Index index)
{
return get<RT>(
env
, index
, mpl::equal_to<Index, mpl::int_<-1> >());
}
};
}
}}
#undef PHOENIX_MAP_LOCAL_TEMPLATE_PARAM
#undef PHOENIX_MAP_LOCAL_DISPATCH
#endif
|
Swift