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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_NOTHING_HPP
#define PHOENIX_CORE_NOTHING_HPP
#include <boost/spirit/home/phoenix/core/actor.hpp>
#include <boost/mpl/bool.hpp>
namespace boost { namespace phoenix
{
///////////////////////////////////////////////////////////////////////////////
//
// null_actor
//
// A actor that does nothing (a "bum", if you will :-).
//
///////////////////////////////////////////////////////////////////////////////
struct null_actor
{
typedef mpl::false_ no_nullary;
template <typename Env>
struct result
{
typedef void type;
};
template <typename Env>
void
eval(Env const&) const
{
}
};
actor<null_actor> const nothing = null_actor();
}}
#endif
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