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/*==============================================================================
Copyright (c) 2005-2010 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 BOOST_PHOENIX_CORE_NOTHING_HPP
#define BOOST_PHOENIX_CORE_NOTHING_HPP
#include <boost/phoenix/core/limits.hpp>
#include <boost/mpl/void.hpp>
#include <boost/phoenix/core/actor.hpp>
#include <boost/phoenix/core/call.hpp>
#include <boost/phoenix/core/expression.hpp>
#include <boost/phoenix/core/value.hpp>
namespace boost { namespace phoenix
{
/////////////////////////////////////////////////////////////////////////////
//
// null_actor
//
// An actor that does nothing (a "bum", if you will :-).
//
/////////////////////////////////////////////////////////////////////////////
namespace detail
{
struct nothing {};
}
namespace expression
{
struct null
: expression::value<detail::nothing>
{};
}
template<typename Dummy>
struct is_custom_terminal<detail::nothing, Dummy>
: mpl::true_
{};
template<typename Dummy>
struct custom_terminal<detail::nothing, Dummy>
{
typedef void result_type;
template <typename Context>
void operator()(detail::nothing, Context &) const
{
}
};
typedef expression::null::type nothing_type;
#ifndef BOOST_PHOENIX_NO_PREDEFINED_TERMINALS
nothing_type const nothing = {{{}}};
#endif
}}
#endif
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