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/*=============================================================================
Copyright (c) 2001-2007 Joel de Guzman
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_CORE_REFERENCE_HPP
#define PHOENIX_CORE_REFERENCE_HPP
#include <boost/spirit/home/phoenix/core/actor.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_reference.hpp>
#include <boost/mpl/bool.hpp>
namespace boost { namespace phoenix
{
template <typename T>
struct reference
{
// $$$ TODO: a better (user friendly) static assert
BOOST_STATIC_ASSERT(
mpl::not_<is_reference<T> >::value != 0);
typedef mpl::false_ no_nullary;
template <typename Env>
struct result
{
typedef T& type;
};
reference(T& arg)
: ref(arg) {}
template <typename Env>
T& eval(Env const&) const
{
return ref;
}
T& ref;
private:
// silence MSVC warning C4512: assignment operator could not be generated
reference& operator= (reference const&);
};
template <typename T>
inline actor<reference<T> > const
ref(T& v)
{
return reference<T>(v);
}
template <typename T>
inline actor<reference<T const> > const
cref(T const& v)
{
return reference<T const>(v);
}
namespace detail
{
struct error_attempting_to_convert_an_actor_to_a_reference {};
}
template <typename Base>
void
ref(actor<Base> const& v
, detail::error_attempting_to_convert_an_actor_to_a_reference
= detail::error_attempting_to_convert_an_actor_to_a_reference());
template <typename Base>
void
cref(actor<Base> const& v
, detail::error_attempting_to_convert_an_actor_to_a_reference
= detail::error_attempting_to_convert_an_actor_to_a_reference());
}}
#endif
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