86 lines
1.8 KiB
C++
86 lines
1.8 KiB
C++
/*=============================================================================
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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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