| 1 | /*============================================================================= |
|---|---|
| 2 | Copyright (c) 2001-2011 Joel de Guzman |
| 3 | |
| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 6 | ==============================================================================*/ |
| 7 | #if !defined(BOOST_FUSION_SUPPORT_UNUSED_20070305_1038) |
| 8 | #define BOOST_FUSION_SUPPORT_UNUSED_20070305_1038 |
| 9 | |
| 10 | #include <boost/fusion/support/config.hpp> |
| 11 | #include <iosfwd> |
| 12 | |
| 13 | #include <boost/config.hpp> |
| 14 | #if defined(BOOST_MSVC) |
| 15 | # pragma warning(push) |
| 16 | # pragma warning(disable: 4522) // multiple assignment operators specified warning |
| 17 | #endif |
| 18 | |
| 19 | #define BOOST_FUSION_UNUSED_HAS_IO |
| 20 | |
| 21 | namespace boost { namespace fusion |
| 22 | { |
| 23 | struct unused_type |
| 24 | { |
| 25 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| 26 | unused_type() BOOST_NOEXCEPT |
| 27 | { |
| 28 | } |
| 29 | |
| 30 | template <typename T> |
| 31 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| 32 | unused_type(T const&) BOOST_NOEXCEPT |
| 33 | { |
| 34 | } |
| 35 | |
| 36 | template <typename T> |
| 37 | BOOST_FUSION_CONSTEXPR_THIS BOOST_FUSION_GPU_ENABLED |
| 38 | unused_type const& |
| 39 | operator=(T const&) const BOOST_NOEXCEPT |
| 40 | { |
| 41 | return *this; |
| 42 | } |
| 43 | |
| 44 | template <typename T> |
| 45 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| 46 | unused_type& |
| 47 | operator=(T const&) BOOST_NOEXCEPT |
| 48 | { |
| 49 | return *this; |
| 50 | } |
| 51 | |
| 52 | BOOST_FUSION_CONSTEXPR_THIS BOOST_FUSION_GPU_ENABLED |
| 53 | unused_type const& |
| 54 | operator=(unused_type const&) const BOOST_NOEXCEPT |
| 55 | { |
| 56 | return *this; |
| 57 | } |
| 58 | |
| 59 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| 60 | unused_type& |
| 61 | operator=(unused_type const&) BOOST_NOEXCEPT |
| 62 | { |
| 63 | return *this; |
| 64 | } |
| 65 | }; |
| 66 | |
| 67 | BOOST_CONSTEXPR_OR_CONST unused_type unused = unused_type(); |
| 68 | |
| 69 | namespace detail |
| 70 | { |
| 71 | struct unused_only |
| 72 | { |
| 73 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| 74 | unused_only(unused_type const&) BOOST_NOEXCEPT {} |
| 75 | }; |
| 76 | } |
| 77 | |
| 78 | BOOST_CONSTEXPR |
| 79 | inline std::ostream& operator<<(std::ostream& out, detail::unused_only const&) BOOST_NOEXCEPT |
| 80 | { |
| 81 | return out; |
| 82 | } |
| 83 | |
| 84 | BOOST_CONSTEXPR |
| 85 | inline std::istream& operator>>(std::istream& in, unused_type&) BOOST_NOEXCEPT |
| 86 | { |
| 87 | return in; |
| 88 | } |
| 89 | }} |
| 90 | |
| 91 | #if defined(BOOST_MSVC) |
| 92 | # pragma warning(pop) |
| 93 | #endif |
| 94 | |
| 95 | #endif |
| 96 |