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/*============================================================================= Copyright (c) 2001-2014 Joel de Guzman Copyright (c) 2001-2011 Hartmut Kaiser 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) ==============================================================================*/ #if !defined(BOOST_SPIRIT_X3_UNUSED_APRIL_16_2006_0616PM) #define BOOST_SPIRIT_X3_UNUSED_APRIL_16_2006_0616PM #include <iosfwd> /////////////////////////////////////////////////////////////////////////////// namespace boost { namespace spirit { namespace x3 { struct unused_type { unused_type() = default; template <typename T> unused_type(T const&) { } template <typename T> unused_type const& operator=(T const&) const { return *this; } template <typename T> unused_type& operator=(T const&) { return *this; } // unused_type can also masquerade as an empty context (see context.hpp) template <typename ID> unused_type get(ID) const { return {}; } }; auto const unused = unused_type{}; inline std::ostream& operator<<(std::ostream& out, unused_type const&) { return out; } inline std::istream& operator>>(std::istream& in, unused_type&) { return in; } }}} #endif