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Diffstat (limited to '3rdParty/Boost/src/boost/phoenix/core/nothing.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/phoenix/core/nothing.hpp | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/phoenix/core/nothing.hpp b/3rdParty/Boost/src/boost/phoenix/core/nothing.hpp new file mode 100644 index 0000000..c63c43a --- /dev/null +++ b/3rdParty/Boost/src/boost/phoenix/core/nothing.hpp @@ -0,0 +1,61 @@ +/*============================================================================== + 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 |