| /*============================================================================= |
| Copyright (c) 2001-2006 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) |
| ==============================================================================*/ |
| #if !defined(BOOST_FUSION_SUPPORT_UNUSED_20070305_1038) |
| #define BOOST_FUSION_SUPPORT_UNUSED_20070305_1038 |
| |
| #include <boost/config.hpp> |
| #if defined(BOOST_MSVC) |
| # pragma warning(push) |
| # pragma warning(disable: 4522) // multiple assignment operators specified warning |
| #endif |
| |
| #define BOOST_FUSION_UNUSED_HAS_IO |
| |
| namespace boost { namespace fusion |
| { |
| struct unused_type |
| { |
| unused_type() |
| { |
| } |
| |
| 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 const& |
| operator=(unused_type const&) const |
| { |
| return *this; |
| } |
| |
| unused_type& |
| operator=(unused_type const&) |
| { |
| return *this; |
| } |
| }; |
| |
| unused_type const unused = unused_type(); |
| |
| namespace detail |
| { |
| struct unused_only |
| { |
| unused_only(unused_type const&) {} |
| }; |
| } |
| |
| template <typename Out> |
| inline Out& operator<<(Out& out, detail::unused_only const&) |
| { |
| return out; |
| } |
| |
| template <typename In> |
| inline In& operator>>(In& in, unused_type&) |
| { |
| return in; |
| } |
| }} |
| |
| #if defined(BOOST_MSVC) |
| # pragma warning(pop) |
| #endif |
| |
| #endif |