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105 lines
2.7 KiB
105 lines
2.7 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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Copyright (c) 2001-2011 Hartmut Kaiser |
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Distributed under the Boost Software License, Version 1.0. (See accompanying |
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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==============================================================================*/ |
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#if !defined(BOOST_SPIRIT_UNUSED_APRIL_16_2006_0616PM) |
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#define BOOST_SPIRIT_UNUSED_APRIL_16_2006_0616PM |
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#if defined(_MSC_VER) |
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#pragma once |
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#endif |
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#include <boost/config.hpp> |
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#include <boost/mpl/bool.hpp> |
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#if defined(BOOST_MSVC) |
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# pragma warning(push) |
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# pragma warning(disable: 4522) // multiple assignment operators specified warning |
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#endif |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { namespace spirit |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// We do not import fusion ::unused_type anymore to avoid boost::fusion |
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// being turned into an associate namespace for boost::spirit, as this |
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// interferes with ADL in unexpected ways. We rather copy the full |
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// unused_type implementation from boost::fusion. |
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/////////////////////////////////////////////////////////////////////////// |
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struct unused_type |
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{ |
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unused_type() |
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{ |
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} |
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template <typename T> |
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unused_type(T const&) |
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{ |
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} |
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template <typename T> |
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unused_type const& |
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operator=(T const&) const |
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{ |
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return *this; |
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} |
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template <typename T> |
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unused_type& |
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operator=(T const&) |
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{ |
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return *this; |
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} |
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unused_type const& |
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operator=(unused_type const&) const |
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{ |
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return *this; |
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} |
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unused_type& |
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operator=(unused_type const&) |
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{ |
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return *this; |
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} |
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}; |
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unused_type const unused = unused_type(); |
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namespace detail |
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{ |
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struct unused_only |
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{ |
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unused_only(unused_type const&) {} |
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}; |
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} |
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template <typename Out> |
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inline Out& operator<<(Out& out, detail::unused_only const&) |
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{ |
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return out; |
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} |
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template <typename In> |
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inline In& operator>>(In& in, unused_type&) |
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{ |
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return in; |
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} |
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/////////////////////////////////////////////////////////////////////////// |
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namespace traits |
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{ |
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// We use this test to detect if the argument is not an unused_type |
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template <typename T> struct not_is_unused : mpl::true_ {}; |
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template <> struct not_is_unused<unused_type> : mpl::false_ {}; |
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} |
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}} |
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#if defined(BOOST_MSVC) |
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# pragma warning(pop) |
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#endif |
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#endif
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