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/*==============================================================================
Copyright (c) 2005-2010 Joel de Guzman
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_CORE_TERMINAL_HPP
#define BOOST_PHOENIX_CORE_TERMINAL_HPP
#include <boost/phoenix/core/limits.hpp>
#include <boost/call_traits.hpp>
#include <boost/is_placeholder.hpp>
#include <boost/phoenix/core/actor.hpp>
#include <boost/phoenix/core/meta_grammar.hpp>
#include <boost/phoenix/core/terminal_fwd.hpp>
#include <boost/proto/matches.hpp>
#include <boost/proto/transform/lazy.hpp>
#include <boost/proto/functional/fusion/at.hpp>
#include <boost/type_traits/remove_pointer.hpp>
#define BOOST_PHOENIX_DEFINE_CUSTOM_TERMINAL(Template, Terminal, IsNullary, EvalFun)\
namespace boost { namespace phoenix \
{ \
namespace result_of \
{ \
Template \
struct is_nullary< \
custom_terminal< \
Terminal \
> \
> \
: IsNullary \
{}; \
} \
Template \
struct is_custom_terminal<Terminal >: mpl::true_ {}; \
\
Template \
struct custom_terminal<Terminal > : proto::call<EvalFun > {}; \
}} \
/**/
namespace boost { namespace phoenix
{
template <typename T, typename Dummy>
struct is_custom_terminal
: mpl::false_ {};
template <typename T, typename Dummy>
struct custom_terminal;
namespace tag {
struct terminal /*: public proto::tag::terminal */ {};
}
namespace expression
{
template <typename T, template <typename> class Actor = actor>
struct terminal
: proto::terminal<
T//typename call_traits<T>::value_type
>
{
typedef
proto::basic_expr<
proto::tag::terminal
// tag::terminal //cannot change to use phoenix tag - breaks code.
, proto::term<T>
, 0
>
base_type;
typedef Actor<base_type> type;
static const type make(typename call_traits<T>::param_type t)
{
// ?? Should the next line be Actor not actor which is the default?
actor<base_type> const e = {base_type::make(t)};
//Actor<base_type> const e = {base_type::make(t)};
return e;
}
};
}
namespace rule
{
struct argument
: proto::if_<boost::is_placeholder<proto::_value>()>
{};
struct custom_terminal
: proto::if_<boost::phoenix::is_custom_terminal<proto::_value>()>
{};
struct terminal
: proto::terminal<proto::_>
{};
}
template <typename Dummy>
struct meta_grammar::case_<proto::tag::terminal, Dummy>
: proto::or_<
enable_rule<rule::argument , Dummy>
, enable_rule<rule::custom_terminal, Dummy>
, enable_rule<rule::terminal , Dummy>
>
{};
template <typename Dummy>
struct default_actions::when<rule::custom_terminal, Dummy>
: proto::lazy<
custom_terminal<proto::_value>(
proto::_value
, _context
)
>
{};
namespace detail
{
template <typename N>
struct placeholder_idx
: mpl::int_<N::value>
{};
}
template <typename Grammar>
struct default_actions::when<rule::argument, Grammar>
: proto::call<
proto::functional::at(
_env
, proto::make<
detail::placeholder_idx<
proto::make<
boost::is_placeholder<proto::_value>()
>
>()
>
)
>
{};
}}
#endif
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Swift