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85 lines
1.8 KiB
85 lines
1.8 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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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_FUSION_SUPPORT_UNUSED_20070305_1038) |
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#define BOOST_FUSION_SUPPORT_UNUSED_20070305_1038 |
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#include <iosfwd> |
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#include <boost/config.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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#define BOOST_FUSION_UNUSED_HAS_IO |
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namespace boost { namespace 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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inline std::ostream& operator<<(std::ostream& out, detail::unused_only const&) |
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{ |
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return out; |
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} |
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inline std::istream& operator>>(std::istream& 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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#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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