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Diffstat (limited to '3rdParty/Boost/src/boost/spirit/home/phoenix/core/nothing.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/spirit/home/phoenix/core/nothing.hpp | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/spirit/home/phoenix/core/nothing.hpp b/3rdParty/Boost/src/boost/spirit/home/phoenix/core/nothing.hpp new file mode 100644 index 0000000..029fbbf --- /dev/null +++ b/3rdParty/Boost/src/boost/spirit/home/phoenix/core/nothing.hpp @@ -0,0 +1,42 @@ +/*============================================================================= + 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 |