| 1 | /*=============================================================================
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| 2 | Copyright (c) 2001-2011 Joel de Guzman
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| 3 |
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| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying
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| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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| 6 | ==============================================================================*/
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| 7 | #if !defined(BOOST_FUSION_SUPPORT_UNUSED_20070305_1038)
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| 8 | #define BOOST_FUSION_SUPPORT_UNUSED_20070305_1038
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| 9 |
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| 10 | #include <boost/fusion/support/config.hpp>
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| 11 | #include <iosfwd>
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| 12 |
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| 13 | #include <boost/config.hpp>
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| 14 | #if defined(BOOST_MSVC)
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| 15 | # pragma warning(push)
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| 16 | # pragma warning(disable: 4522) // multiple assignment operators specified warning
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| 17 | #endif
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| 18 |
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| 19 | #define BOOST_FUSION_UNUSED_HAS_IO
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| 20 |
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| 21 | namespace boost { namespace fusion
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| 22 | {
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| 23 | struct unused_type
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| 24 | {
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| 25 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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| 26 | unused_type() BOOST_NOEXCEPT
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| 27 | {
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| 28 | }
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| 29 |
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| 30 | template <typename T>
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| 31 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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| 32 | unused_type(T const&) BOOST_NOEXCEPT
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| 33 | {
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| 34 | }
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| 35 |
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| 36 | template <typename T>
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| 37 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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| 38 | unused_type const&
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| 39 | operator=(T const&) const BOOST_NOEXCEPT
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| 40 | {
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| 41 | return *this;
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| 42 | }
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| 43 |
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| 44 | template <typename T>
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| 45 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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| 46 | unused_type&
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| 47 | operator=(T const&) BOOST_NOEXCEPT
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| 48 | {
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| 49 | return *this;
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| 50 | }
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| 51 | #if defined(__GXX_EXPERIMENTAL_CXX0X__) && __GNUC__ == 4 && __GNUC_MINOR__ <= 6
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| 52 | // nothing
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| 53 | #else
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| 54 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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| 55 | unused_type const&
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| 56 | operator=(unused_type const&) const BOOST_NOEXCEPT
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| 57 | {
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| 58 | return *this;
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| 59 | }
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| 60 |
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| 61 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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| 62 | unused_type&
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| 63 | operator=(unused_type const&) BOOST_NOEXCEPT
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| 64 | {
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| 65 | return *this;
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| 66 | }
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| 67 | #endif
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| 68 | };
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| 69 |
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| 70 | #if defined(__GXX_EXPERIMENTAL_CXX0X__) && __GNUC__ == 4 && __GNUC_MINOR__ <= 6
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| 71 | BOOST_CONSTEXPR unused_type /*const*/ unused = unused_type();
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| 72 | #else
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| 73 | BOOST_CONSTEXPR unused_type const unused = unused_type();
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| 74 | #endif
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| 75 |
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| 76 | namespace detail
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| 77 | {
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| 78 | struct unused_only
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| 79 | {
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| 80 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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| 81 | unused_only(unused_type const&) BOOST_NOEXCEPT {}
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| 82 | };
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| 83 | }
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| 84 |
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| 85 | BOOST_CONSTEXPR
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| 86 | inline std::ostream& operator<<(std::ostream& out, detail::unused_only const&) BOOST_NOEXCEPT
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| 87 | {
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| 88 | return out;
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| 89 | }
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| 90 |
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| 91 | BOOST_CONSTEXPR
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| 92 | inline std::istream& operator>>(std::istream& in, unused_type&) BOOST_NOEXCEPT
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| 93 | {
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| 94 | return in;
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| 95 | }
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| 96 | }}
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| 97 |
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| 98 | #if defined(BOOST_MSVC)
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| 99 | # pragma warning(pop)
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| 100 | #endif
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| 101 |
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| 102 | #endif
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